GNU bug report logs - #43023
clang++ in a {clang-toolchain + gcc-toolchain} environment

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Package: guix; Reported by: Emmanuel Agullo <emmanuel.agullo@HIDDEN>; dated Mon, 24 Aug 2020 15:24:02 UTC; Maintainer for guix is bug-guix@HIDDEN.

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From: Emmanuel Agullo <emmanuel.agullo@HIDDEN>
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Subject: clang++ in a {clang-toolchain + gcc-toolchain} environment
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Hello, 

A typical "hello world" C++ fails in an environment with both 
`gcc-toolchain' and `clang-toolchain', apperently due to the setup of 
the `CPLUS_INCLUDE_PATH' environment variable (used because of the 
`#include <iostream>' instruction), when compiling with `clang++'. 

I do not know if this is a bug or the expected behaviour. Obviously one 
is not likely to explicitly load an environment with both `gcc-toolchain' 
and `clang-toolchain' but migth do so implictly (and possibly not being 
aware of it) for instance having `gcc-toolchain' globally installed and 
at some point loading `clang-toolchain' in an environment. 

Note that it is not critical at all in practice in my case, and I do 
not know whether it it is desirable to fix it in some way, or, maybe 
mention the incompatibility somewhere 
(<https://guix.gnu.org/manual/en/html_node/Development.html> ?) if not 
already done so – in which case I am sorry for the noise. 

Please find below: 
1. a simplified C++ "hello world" hello.cpp program 
2. an expected g++ behaviour in a `gcc-toolchain' environment 
3. an expected clang++ behaviour in a `clang-toolchain' environment 
4. an environment with both `gcc-toolchain' & `clang-toolchain' 
- 4.1. with an expected behaviour using `g++' 
- 4.2. with an (expected or not?) error using `clang++' 
- 4.3. a (non desirable) fix of the `CPLUS_INCLUDE_PATH' (removing 
`/gnu/store/…/include/c++') 
5. the employed channels if it may help 

Thanks much for the continous development and support, and once 
again sorry for the possible noise if this is a known expected 
behaviour. 

With best regards, 

Emmanuel 


1 simplified (no newline) C++ "hello world" hello.cpp program 
═════════════════════════════════════════════════════════════ 

┌──── 
│ #include <iostream> 
│ 
│ int main() { 
│ std::cout << "Hello World!"; 
│ return 0; 
│ } 
└──── 


2 `gcc-toolchain' environment 
═════════════════════════════ 

┌──── 
│ guix environment -C --ad-hoc gcc-toolchain coreutils grep 
│ env | grep CPLUS_INCLUDE_PATH 
│ g++ hello.cpp 
│ ./a.out 
└──── 

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 
CPLUS_INCLUDE_PATH=/gnu/store/gsylxn8q06w6y7622nw159f3q1vvcx2i-profile/include/c++:/gnu/store/gsylxn8q06w6y7622nw159f3q1vvcx2i-profile/include 
Hello World! 
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 


3 `clang-toolchain' environment 
═══════════════════════════════ 

┌──── 
│ guix environment -C --ad-hoc clang-toolchain coreutils grep 
│ env | grep CPLUS_INCLUDE_PATH 
│ clang++ hello.cpp 
│ ./a.out 
└──── 

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 
CPLUS_INCLUDE_PATH=/gnu/store/8qlafmilvc0g1yv8lmilpjmps3p4nrmq-profile/include 
Hello World! 
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 


4 environment with both `gcc-toolchain' & `clang-toolchain' 
═══════════════════════════════════════════════════════════ 

4.1 compilation with `g++' 
────────────────────────── 

`g++' in an environment with both gcc and clang toolchains is fine: 
┌──── 
│ guix environment -C --ad-hoc gcc-toolchain clang-toolchain coreutils grep 
│ env | grep CPLUS_INCLUDE_PATH 
│ g++ hello.cpp 
│ ./a.out 
└──── 

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 
CPLUS_INCLUDE_PATH=/gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++:/gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include 
Hello World! 
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 


4.2 compilation with `clang++' (FAIL) 
───────────────────────────────────── 

But `clang++' in the same environment (with both gcc and clang 
toolchains) breaks, raising the following error: 
┌──── 
│ guix environment -C --ad-hoc gcc-toolchain clang-toolchain coreutils grep 
│ clang++ hello.cpp 
└──── 

Error obtained during the `clang++ hello.cpp' step: 
┌──── 
│ In file included from hello.cpp:1: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/iostream:39: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/ostream:38: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/ios:39: 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/exception:105:3: error: unknown type name '_GLIBCXX17_DEPRECATED' 
│ _GLIBCXX17_DEPRECATED 
│ ^ 
│ In file included from hello.cpp:1: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/iostream:39: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/ostream:38: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/ios:39: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/exception:147: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/bits/exception_ptr.h:40: 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:126:1: error: unknown type name '_GLIBCXX_NODISCARD' 
│ _GLIBCXX_NODISCARD void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc) 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:128:1: error: unknown type name '_GLIBCXX_NODISCARD' 
│ _GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc) 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:140:1: error: unknown type name '_GLIBCXX_NODISCARD' 
│ _GLIBCXX_NODISCARD void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:142:1: error: unknown type name '_GLIBCXX_NODISCARD' 
│ _GLIBCXX_NODISCARD void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:174:1: error: unknown type name '_GLIBCXX_NODISCARD' 
│ _GLIBCXX_NODISCARD inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:175:10: error: cannot initialize return object of type 'int *' with an lvalue of type 'void *' 
│ { return __p; } 
│ ^~~ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:176:1: error: unknown type name '_GLIBCXX_NODISCARD' 
│ _GLIBCXX_NODISCARD inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:177:10: error: cannot initialize return object of type 'int *' with an lvalue of type 'void *' 
│ { return __p; } 
│ ^~~ 
│ In file included from hello.cpp:1: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/iostream:39: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/ostream:38: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/ios:39: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/exception:148: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/bits/nested_exception.h:40: 
│ In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/bits/move.h:57: 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:696:27: error: expected unqualified-id 
│ _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead") 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:696:27: error: expected ')' 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:696:26: note: to match this '(' 
│ _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead") 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2648:5: error: unknown type name '_GLIBCXX20_CONSTEXPR' 
│ _GLIBCXX20_CONSTEXPR 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2650:5: error: no variable template matches partial specialization 
│ _Require<__not_<__is_tuple_like<_Tp>>, 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2652:31: error: expected ';' at end of declaration 
│ is_move_assignable<_Tp>> 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2653:10: error: unknown type name '_Tp' 
│ swap(_Tp&, _Tp&) 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2653:16: error: unknown type name '_Tp' 
│ swap(_Tp&, _Tp&) 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2654:51: error: use of undeclared identifier '_Tp' 
│ noexcept(__and_<is_nothrow_move_constructible<_Tp>, 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2654:55: error: expected a type 
│ noexcept(__and_<is_nothrow_move_constructible<_Tp>, 
│ ^ 
│ /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2653:5: error: C++ requires a type specifier for all declarations 
│ swap(_Tp&, _Tp&) 
│ ^ 
│ fatal error: too many errors emitted, stopping now [-ferror-limit=] 
│ 20 errors generated. 
└──── 


4.3 (non desirable) fix of the `CPLUS_INCLUDE_PATH' (removing `/gnu/store/.../include/c++') 
─────────────────────────────────────────────────────────────────────────────────────────── 

For information, it is possible (but obviously in general not 
desirable) to fix the `CPLUS_INCLUDE_PATH' variable (removing 
`/gnu/store/.../include/c++'), which leads to a correct compilation 
(and execution). 

┌──── 
│ guix environment -C --ad-hoc gcc-toolchain clang-toolchain coreutils grep 
│ export CPLUS_INCLUDE_PATH=/gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include 
│ clang++ hello.cpp 
│ ./a.out 
└──── 

┌──── 
│ Hello World! 
└──── 


5 channels 
══════════ 

┌──── 
│ guix describe --format=channels 
└──── 

┌──── 
│ (list (channel 
│ (name 'guix-hpc) 
│ (url "https://gitlab.inria.fr/guix-hpc/guix-hpc.git") 
│ (commit 
│ "fa87605fe93fb85b02dad9db246299bcf223f2e0")) 
│ (channel 
│ (name 'guix-hpc-non-free) 
│ (url "https://gitlab.inria.fr/guix-hpc/guix-hpc-non-free.git") 
│ (commit 
│ "43d8cb72144a183aa7a93499f9c59ec0f84244b0")) 
│ (channel 
│ (name 'guix) 
│ (url "https://git.savannah.gnu.org/git/guix.git") 
│ (commit 
│ "c6872990b51971922f3064cba54ab752fcdc1559") 
│ (introduction 
│ (make-channel-introduction 
│ "9edb3f66fd807b096b48283debdcddccfea34bad" 
│ (openpgp-fingerprint 
│ "BBB0 2DDF 2CEA F6A8 0D1D E643 A2A0 6DF2 A33A 54FA"))))) 
└──── 


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<html><body><div style=3D"font-family: arial, helvetica, sans-serif; font-s=
ize: 12pt; color: #000000"><div>Hello,<br><br>A typical "hello world" C++ f=
ails in an environment with both<br>`gcc-toolchain' and `clang-toolchain', =
apperently due to the setup of<br>the `CPLUS_INCLUDE_PATH' environment vari=
able (used because of the<br>`#include &lt;iostream&gt;' instruction), when=
 compiling with `clang++'.<br><br>I do not know if this is a bug or the exp=
ected behaviour. Obviously one </div><div>is not likely to explicitly load =
an environment with both `gcc-toolchain' </div><div>and `clang-toolchain' b=
ut migth do so implictly (and possibly not being<br>aware of it) for instan=
ce having `gcc-toolchain' globally installed and<br>at some point loading `=
clang-toolchain' in an environment.<br><br>Note that it is not critical at =
all in practice in my case, and I do<br>not know whether it it is desirable=
 to fix it in some way, or, maybe<br>mention the incompatibility somewhere<=
br>(&lt;https://guix.gnu.org/manual/en/html_node/Development.html&gt; ?) if=
 not<br>already done so =E2=80=93 in which case I am sorry for the noise.<b=
r><br>Please find below:<br>1. a simplified C++ "hello world" hello.cpp pro=
gram<br>2. an expected g++ behaviour in a `gcc-toolchain' environment<br>3.=
 an expected clang++ behaviour in a `clang-toolchain' environment<br>4. an =
environment with both `gcc-toolchain' &amp; `clang-toolchain'<br>- 4.1. wit=
h an expected behaviour using `g++'<br>- 4.2. with an (expected or not?) er=
ror using `clang++'<br>- 4.3. a (non desirable) fix of the `CPLUS_INCLUDE_P=
ATH' (removing<br>&nbsp; `/gnu/store/=E2=80=A6/include/c++')<br>5. the empl=
oyed channels if it may help<br><br>Thanks much for the continous developme=
nt and support, and once</div><div>again sorry for the possible noise if th=
is is a known expected</div><div>behaviour.<br><br>With best regards,<br><b=
r>Emmanuel<br><br><br>1 simplified (no newline) C++ "hello world" hello.cpp=
 program<br>=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=
=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=
=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=
=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=
=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=
=E2=95=90=E2=95=90=E2=95=90=E2=95=90<br><br>&nbsp; =E2=94=8C=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80<br>&nbsp; =E2=94=82 #include &lt;iostream&gt;<br>&nbs=
p; =E2=94=82 <br>&nbsp; =E2=94=82 int main() {<br>&nbsp; =E2=94=82&nbsp;&nb=
sp;&nbsp;&nbsp; std::cout &lt;&lt; "Hello World!";<br>&nbsp; =E2=94=82&nbsp=
;&nbsp;&nbsp;&nbsp; return 0;<br>&nbsp; =E2=94=82 }<br>&nbsp; =E2=94=94=E2=
=94=80=E2=94=80=E2=94=80=E2=94=80<br><br><br>2 `gcc-toolchain' environment<=
br>=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=
=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=
=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90<br><br>&nbsp; =E2=94=8C=E2=94=80=E2=
=94=80=E2=94=80=E2=94=80<br>&nbsp; =E2=94=82 guix environment -C --ad-hoc g=
cc-toolchain coreutils grep<br>&nbsp; =E2=94=82 env | grep CPLUS_INCLUDE_PA=
TH<br>&nbsp; =E2=94=82 g++ hello.cpp<br>&nbsp; =E2=94=82 ./a.out<br>&nbsp; =
=E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br><br>&nbsp; =E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81<br>&nbsp;&nbsp; CPLUS_INCLUDE_PATH=3D/gnu/store/gsylxn8q06w6y7622nw159f=
3q1vvcx2i-profile/include/c++:/gnu/store/gsylxn8q06w6y7622nw159f3q1vvcx2i-p=
rofile/include&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>&nbsp;&n=
bsp; Hello&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; World! <br>&nbsp; =E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81<br><br><br>3 `clang-too=
lchain' environment<br>=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=
=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=
=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90<br><br>&nbsp; =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br>&nbsp; =
=E2=94=82 guix environment -C --ad-hoc clang-toolchain coreutils grep<br>&n=
bsp; =E2=94=82 env | grep CPLUS_INCLUDE_PATH<br>&nbsp; =E2=94=82 clang++ he=
llo.cpp<br>&nbsp; =E2=94=82 ./a.out<br>&nbsp; =E2=94=94=E2=94=80=E2=94=80=
=E2=94=80=E2=94=80<br><br>&nbsp; =E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
<br>&nbsp;&nbsp; CPLUS_INCLUDE_PATH=3D/gnu/store/8qlafmilvc0g1yv8lmilpjmps3=
p4nrmq-profile/include&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>=
&nbsp;&nbsp; Hello&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; World! <br>&nbsp; =E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
<br><br><br>4 environment with both `gcc-toolchain' &amp; `clang-toolchain'=
<br>=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=
=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=
=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=
=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=
=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90=E2=95=90<br><br>4.1 compilation with `g++'<br>=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=
=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br><br>&nbsp; =
`g++' in an environment with both gcc and clang toolchains is fine:<br>&nbs=
p; =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br>&nbsp; =E2=94=82 guix e=
nvironment -C --ad-hoc gcc-toolchain clang-toolchain coreutils grep<br>&nbs=
p; =E2=94=82 env | grep CPLUS_INCLUDE_PATH<br>&nbsp; =E2=94=82 g++ hello.cp=
p<br>&nbsp; =E2=94=82 ./a.out<br>&nbsp; =E2=94=94=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80<br><br>&nbsp; =E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81<br>&nbsp;&nbsp; CPLUS_INCLUDE=
_PATH=3D/gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++:/gn=
u/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp; Hello&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; World! <br>&nbsp; =
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81<br><br><br>4.2 compilation with `clang++' (FAIL)<br>=E2=
=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=
=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80=E2=94=80<br><br>&nbsp; But `clang++' in the same envi=
ronment (with both gcc and clang<br>&nbsp; toolchains) breaks, raising the =
following error:<br>&nbsp; =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br=
>&nbsp; =E2=94=82 guix environment -C --ad-hoc gcc-toolchain clang-toolchai=
n coreutils grep<br>&nbsp; =E2=94=82 clang++ hello.cpp<br>&nbsp; =E2=94=94=
=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br><br>&nbsp; Error obtained during th=
e `clang++ hello.cpp' step:<br>&nbsp; =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80<br>&nbsp; =E2=94=82 In file included from hello.cpp:1:<br>&nbsp; =
=E2=94=82 In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z=
-profile/include/c++/iostream:39:<br>&nbsp; =E2=94=82 In file included from=
 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/ostream:38=
:<br>&nbsp; =E2=94=82 In file included from /gnu/store/3ka3a9wgx5sk6ac84nld=
x7ldpxppn29z-profile/include/c++/ios:39:<br>&nbsp; =E2=94=82 /gnu/store/3ka=
3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/exception:105:3: error: u=
nknown type name '_GLIBCXX17_DEPRECATED'<br>&nbsp; =E2=94=82&nbsp;&nbsp; _G=
LIBCXX17_DEPRECATED<br>&nbsp; =E2=94=82&nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 I=
n file included from hello.cpp:1:<br>&nbsp; =E2=94=82 In file included from=
 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/iostream:3=
9:<br>&nbsp; =E2=94=82 In file included from /gnu/store/3ka3a9wgx5sk6ac84nl=
dx7ldpxppn29z-profile/include/c++/ostream:38:<br>&nbsp; =E2=94=82 In file i=
ncluded from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c+=
+/ios:39:<br>&nbsp; =E2=94=82 In file included from /gnu/store/3ka3a9wgx5sk=
6ac84nldx7ldpxppn29z-profile/include/c++/exception:147:<br>&nbsp; =E2=94=82=
 In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/=
include/c++/bits/exception_ptr.h:40:<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9w=
gx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:126:1: error: unknown typ=
e name '_GLIBCXX_NODISCARD'<br>&nbsp; =E2=94=82 _GLIBCXX_NODISCARD void* op=
erator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)<br>&nbsp; =E2=94=82=
 ^<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/=
include/c++/new:128:1: error: unknown type name '_GLIBCXX_NODISCARD'<br>&nb=
sp; =E2=94=82 _GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX=
_THROW (std::bad_alloc)<br>&nbsp; =E2=94=82 ^<br>&nbsp; =E2=94=82 /gnu/stor=
e/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:140:1: error: un=
known type name '_GLIBCXX_NODISCARD'<br>&nbsp; =E2=94=82 _GLIBCXX_NODISCARD=
 void* operator new(std::size_t, const std::nothrow_t&amp;) _GLIBCXX_USE_NO=
EXCEPT<br>&nbsp; =E2=94=82 ^<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac=
84nldx7ldpxppn29z-profile/include/c++/new:142:1: error: unknown type name '=
_GLIBCXX_NODISCARD'<br>&nbsp; =E2=94=82 _GLIBCXX_NODISCARD void* operator n=
ew[](std::size_t, const std::nothrow_t&amp;) _GLIBCXX_USE_NOEXCEPT<br>&nbsp=
; =E2=94=82 ^<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn2=
9z-profile/include/c++/new:174:1: error: unknown type name '_GLIBCXX_NODISC=
ARD'<br>&nbsp; =E2=94=82 _GLIBCXX_NODISCARD inline void* operator new(std::=
size_t, void* __p) _GLIBCXX_USE_NOEXCEPT<br>&nbsp; =E2=94=82 ^<br>&nbsp; =
=E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/n=
ew:175:10: error: cannot initialize return object of type 'int *' with an l=
value of type 'void *'<br>&nbsp; =E2=94=82 { return __p; }<br>&nbsp; =E2=94=
=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ^~~<br>&nbsp; =E2=
=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:=
176:1: error: unknown type name '_GLIBCXX_NODISCARD'<br>&nbsp; =E2=94=82 _G=
LIBCXX_NODISCARD inline void* operator new[](std::size_t, void* __p) _GLIBC=
XX_USE_NOEXCEPT<br>&nbsp; =E2=94=82 ^<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9=
wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/new:177:10: error: cannot in=
itialize return object of type 'int *' with an lvalue of type 'void *'<br>&=
nbsp; =E2=94=82 { return __p; }<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ^~~<br>&nbsp; =E2=94=82 In file included fro=
m hello.cpp:1:<br>&nbsp; =E2=94=82 In file included from /gnu/store/3ka3a9w=
gx5sk6ac84nldx7ldpxppn29z-profile/include/c++/iostream:39:<br>&nbsp; =E2=94=
=82 In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profi=
le/include/c++/ostream:38:<br>&nbsp; =E2=94=82 In file included from /gnu/s=
tore/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/ios:39:<br>&nbsp;=
 =E2=94=82 In file included from /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29=
z-profile/include/c++/exception:148:<br>&nbsp; =E2=94=82 In file included f=
rom /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/bits/ne=
sted_exception.h:40:<br>&nbsp; =E2=94=82 In file included from /gnu/store/3=
ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/bits/move.h:57:<br>&nbs=
p; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c+=
+/type_traits:696:27: error: expected unqualified-id<br>&nbsp; =E2=94=82&nb=
sp;&nbsp;&nbsp;&nbsp; _GLIBCXX20_DEPRECATED("use is_standard_layout &amp;&a=
mp; is_trivial instead")<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 /g=
nu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:6=
96:27: error: expected ')'<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84=
nldx7ldpxppn29z-profile/include/c++/type_traits:696:26: note: to match this=
 '('<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; _GLIBCXX20_DEPRECATED("use=
 is_standard_layout &amp;&amp; is_trivial instead")<br>&nbsp; =E2=94=82&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ^<b=
r>&nbsp; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/incl=
ude/c++/type_traits:2648:5: error: unknown type name '_GLIBCXX20_CONSTEXPR'=
<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; _GLIBCXX20_CONSTEXPR<br>&nbsp;=
 =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9w=
gx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2650:5: error: no=
 variable template matches partial specialization<br>&nbsp; =E2=94=82&nbsp;=
&nbsp;&nbsp;&nbsp; _Require&lt;__not_&lt;__is_tuple_like&lt;_Tp&gt;&gt;,<br=
>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 /gnu/store/=
3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2652:31: e=
rror: expected ';' at end of declaration<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; is_move_ass=
ignable&lt;_Tp&gt;&gt;<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 /gnu/store/3k=
a3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2653:10: err=
or: unknown type name '_Tp'<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; swa=
p(_Tp&amp;, _Tp&amp;)<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx=
7ldpxppn29z-profile/include/c++/type_traits:2653:16: error: unknown type na=
me '_Tp'<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; swap(_Tp&amp;, _Tp&amp=
;)<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 /gnu/store/3ka3=
a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c++/type_traits:2654:51: error=
: use of undeclared identifier '_Tp'<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&=
nbsp; noexcept(__and_&lt;is_nothrow_move_constructible&lt;_Tp&gt;,<br>&nbsp=
; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn2=
9z-profile/include/c++/type_traits:2654:55: error: expected a type<br>&nbsp=
; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; noexcept(__and_&lt;is_nothrow_move_cons=
tructible&lt;_Tp&gt;,<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ^<br>&nbs=
p; =E2=94=82 /gnu/store/3ka3a9wgx5sk6ac84nldx7ldpxppn29z-profile/include/c+=
+/type_traits:2653:5: error: C++ requires a type specifier for all declarat=
ions<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; swap(_Tp&amp;, _Tp&amp;)<b=
r>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp; ^<br>&nbsp; =E2=94=82 fatal erro=
r: too many errors emitted, stopping now [-ferror-limit=3D]<br>&nbsp; =E2=
=94=82 20 errors generated.<br>&nbsp; =E2=94=94=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80<br><br><br>4.3 (non desirable) fix of the `CPLUS_INCLUDE_PATH' (r=
emoving `/gnu/store/.../include/c++')<br>=E2=94=80=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=
=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=
=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=
=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br><br>&nbsp; For information, it is p=
ossible (but obviously in general not<br>&nbsp; desirable) to fix the `CPLU=
S_INCLUDE_PATH' variable (removing<br>&nbsp; `/gnu/store/.../include/c++'),=
 which leads to a correct compilation<br>&nbsp; (and execution).<br><br>&nb=
sp; =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br>&nbsp; =E2=94=82 guix =
environment -C --ad-hoc gcc-toolchain clang-toolchain coreutils grep<br>&nb=
sp; =E2=94=82 export CPLUS_INCLUDE_PATH=3D/gnu/store/3ka3a9wgx5sk6ac84nldx7=
ldpxppn29z-profile/include<br>&nbsp; =E2=94=82 clang++ hello.cpp<br>&nbsp; =
=E2=94=82 ./a.out<br>&nbsp; =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80<b=
r><br>&nbsp; =E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br>&nbsp; =E2=94=
=82 Hello World!<br>&nbsp; =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br=
><br><br>5 channels<br>=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90=E2=95=
=90=E2=95=90=E2=95=90=E2=95=90=E2=95=90<br><br>&nbsp; =E2=94=8C=E2=94=80=E2=
=94=80=E2=94=80=E2=94=80<br>&nbsp; =E2=94=82 guix describe --format=3Dchann=
els<br>&nbsp; =E2=94=94=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br><br>&nbsp; =
=E2=94=8C=E2=94=80=E2=94=80=E2=94=80=E2=94=80<br>&nbsp; =E2=94=82 (list (ch=
annel<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (=
name 'guix-hpc)<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; (url "https://gitlab.inria.fr/guix-hpc/guix-hpc.git")<br>&nbsp; =
=E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (commit<br>&nbsp;=
 =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "fa8=
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sp;&nbsp;&nbsp;&nbsp; (channel<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; (name 'guix-hpc-non-free)<br>&nbsp; =E2=94=82&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (url "https://gitlab.inria.fr/gu=
ix-hpc/guix-hpc-non-free.git")<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; (commit<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "43d8cb72144a183aa7a93499f9c59ec0f8424=
4b0"))<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (channel<br>=
&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (name 'gui=
x)<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (url=
 "https://git.savannah.gnu.org/git/guix.git")<br>&nbsp; =E2=94=82&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (commit<br>&nbsp; =E2=94=82&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "c6872990b51971922f3064=
cba54ab752fcdc1559")<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; (introduction<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (make-channel-introduction<br>&nbsp; =E2=
=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; "9edb3f66fd807b096b48283debdcddccfea34bad"<br>&nbsp; =E2=94=82&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (openpgp-fi=
ngerprint<br>&nbsp; =E2=94=82&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "BBB0 2DDF 2CEA F6A8 0D1D&nbsp; E643=
 A2A0 6DF2 A33A 54FA")))))<br>&nbsp; =E2=94=94=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80<br><br data-mce-bogus=3D"1"></div></div></body></html>
--=_31f9a8b4-834e-42a7-9635-94f73c30bc07--




Acknowledgement sent to Emmanuel Agullo <emmanuel.agullo@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#43023; Package guix. Full text available.
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Last modified: Mon, 24 Aug 2020 15:30:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.