GNU bug report logs - #29298
C++ compiler, Newlib and "implicit declaration of function '_spawnv'"

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Package: libtool; Reported by: noloader@HIDDEN; dated Tue, 14 Nov 2017 16:58:02 UTC; Maintainer for libtool is bug-libtool@HIDDEN.

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From: Jeffrey Walton <noloader@HIDDEN>
Date: Tue, 14 Nov 2017 12:08:44 -0500
Message-ID: <CAH8yC8nru68V6k18aWbYZkSjF2D_-Bh1UBiiTCr+=5Hx1Tqc0Q@HIDDEN>
Subject: Re: bug#29298: C++ compiler, Newlib and "implicit declaration of
 function '_spawnv'"
To: 29298 <at> debbugs.gnu.org
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On Tue, Nov 14, 2017 at 11:57 AM, Jeffrey Walton <noloader@HIDDEN> wrote:
> Hi Everyone,
>
> We are testing an Autotools front-end on MSYS2. The download is
> available from https://mingw-w64.org/.
>
> ...
> /bin/sh ./libtool  --tag=CXX   --mode=link g++ -pthread
> -fdata-sections -ffunction-sections -pipe
> -DCRYPTOPP_DATA_DIR='"@pkgdatadir@/cryptopp/"' -g -O2 -pthread
> -Wl,--gc-sections  -o cryptest.exe cryptest-test.o cryptest-bench1.o
> cryptest-bench2.o cryptest-validat0.o cryptest-validat1.o
> cryptest-validat2.o cryptest-validat3.o cryptest-datatest.o
> cryptest-regtest1.o cryptest-regtest2.o cryptest-regtest3.o
> cryptest-dlltest.o cryptest-fipsalgt.o cryptest-adhoc.o libcryptopp.la
> /bin/sh ./libtool  --tag=CXX   --mode=link g++ -pthread
> -fdata-sections -ffunction-sections -pipe -g -O2 -pthread
> -Wl,--gc-sections  -o cryptestcwd.exe cryptestcwd-test.o
> cryptestcwd-bench1.o cryptestcwd-bench2.o cryptestcwd-validat0.o
> cryptestcwd-validat1.o cryptestcwd-validat2.o cryptestcwd-validat3.o
> cryptestcwd-datatest.o cryptestcwd-regtest1.o cryptestcwd-regtest2.o
> cryptestcwd-regtest3.o cryptestcwd-dlltest.o cryptestcwd-fipsalgt.o
> cryptestcwd-adhoc.o libcryptopp.la
> libtool: link: g++ -pthread -fdata-sections -ffunction-sections -pipe
> -g -O2 -pthread -Wl,--gc-sections -o .libs/cryptestcwd.exe
> cryptestcwd-test.o cryptestcwd-bench1.o cryptestcwd-bench2.o
> cryptestcwd-validat0.o cryptestcwd-validat1.o cryptestcwd-validat2.o
> cryptestcwd-validat3.o cryptestcwd-datatest.o cryptestcwd-regtest1.o
> cryptestcwd-regtest2.o cryptestcwd-regtest3.o cryptestcwd-dlltest.o
> cryptestcwd-fipsalgt.o cryptestcwd-adhoc.o  ./.libs/libcryptopp.a
> -pthread
> libtool: link: g++ -pthread -fdata-sections -ffunction-sections -pipe
> -DCRYPTOPP_DATA_DIR=\"@pkgdatadir@/cryptopp/\" -g -O2 -pthread
> -Wl,--gc-sections -o .libs/cryptest.exe cryptest-test.o
> cryptest-bench1.o cryptest-bench2.o cryptest-validat0.o
> cryptest-validat1.o cryptest-validat2.o cryptest-validat3.o
> cryptest-datatest.o cryptest-regtest1.o cryptest-regtest2.o
> cryptest-regtest3.o cryptest-dlltest.o cryptest-fipsalgt.o
> cryptest-adhoc.o  ./.libs/libcryptopp.a -pthread
> ./.libs/lt-cryptestcwd.c: In function 'main':
> ./.libs/lt-cryptest.c: In function 'main':
> ./.libs/lt-cryptestcwd.c:319:16: warning: implicit declaration of
> function '_spawnv' [-Wimplicit-function-declaration]
>    rval = (int) _spawnv (_P_WAIT, lt_argv_zero, (const char * const *) newargz);
>                 ^~~~~~~
> ./.libs/lt-cryptest.c:319:16: warning: implicit declaration of
> function '_spawn ' [-Wimplicit-function-declaration]
>    rval = (int) _spawnv (_P_WAIT, lt_argv_zero, (const char * const *) newargz);
>                 ^~~~~~~
> /tmp/ccFfsaBb.o: In function `main':
> /home/cryptopp/./.libs/lt-cryptest.c:319: undefined reference to `_spawnv'
> /home/cryptopp/./.libs/lt-cryptest.c:319:(.text.startup+0x4b4):
> relocation truncated to fit: R_X86_64_PC32 against undefined symbol
> `_spawnv'
> collect2: error: ld returned 1 exit status
> /tmp/ccfJfnlw.o: In function `main':
> /home/cryptopp/./.libs/lt-cryptestcwd.c:319: undefined reference to `_spawnv'
> /home/cryptopp/./.libs/lt-cryptestcwd.c:319:(.text.startup+0x4b4):
> relocation truncated to fit: R_X86_64_PC32 against undefined symbol
> `_spawnv'
> strip: './cryptest.exe': No such file
> collect2: error: ld returned 1 exit status
> strip: './cryptestcwd.exe': No such file
> ./libtool: line 11083: ./cryptest.exe: No such file or directory
> ./libtool: line 11083: ./cryptestcwd.exe: No such file or directory
> make[1]: Leaving directory '/home/cryptopp'

Looking at the flags selected by libtool, I think there's another bug
present (correct me if I am wrong)...

When C and C++ are mixed/matched like above, the C source files also
need to be compiled with (1) -frtti to ensure type information is
available; and (2) -fexceptions to ensure exceptions pass correctly
through functions in C object files.

It may be better for libtools to provide both lt-cryptest.cpp and
lt-cryptestcwd.cpp in C++ projects so the mixing and matching does not
occur. That is, the libtool provided files will get the correct
CXXFLAGS by default.

It may be worth mentioning: we don't use/set CFLAGS; libtool needs to
get the project flags through CXXFLAGS in this case.

Jeff
Information forwarded to bug-libtool@HIDDEN:
bug#29298; Package libtool. Full text available.

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From: Jeffrey Walton <noloader@HIDDEN>
Date: Tue, 14 Nov 2017 11:57:09 -0500
Message-ID: <CAH8yC8mUrmng5HC5YHRwYyPL5gQCRxw6myU=gyAgSdU-fruMRA@HIDDEN>
Subject: C++ compiler, Newlib and "implicit declaration of function '_spawnv'"
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Hi Everyone,

We are testing an Autotools front-end on MSYS2. The download is
available from https://mingw-w64.org/.

We are a C++ project so we AC_PROG_CXX and AC_LANG([C++]) in
configure.ac. MSYS2 uses Newlib, and quite a few symbols are missing
because Newlib adheres to Posix more strictly than glibc and
libstdc++. The Autotools machinery produces files like lt-cryptest.c
and lt-cryptestcwd.c.

When libtool compiles its C source files with the C++ compiler on a
system with Newlib, I believe it needs to set _XOPEN_SOURCE=600.
Otherwise, errors like below are encountered. Also see
http://pubs.opengroup.org/onlinepubs/007904975/functions/xsh_chap02_02.html.

In fact, the Newlib folks recommend setting _XOPEN_SOURCE for both the
GNU and Newlib runtimes. Also see
https://sourceware.org/ml/newlib/2017/msg01100.html.

Jeff

**********

/bin/sh ./libtool  --tag=CXX   --mode=link g++ -pthread
-fdata-sections -ffunction-sections -pipe
-DCRYPTOPP_DATA_DIR='"@pkgdatadir@/cryptopp/"' -g -O2 -pthread
-Wl,--gc-sections  -o cryptest.exe cryptest-test.o cryptest-bench1.o
cryptest-bench2.o cryptest-validat0.o cryptest-validat1.o
cryptest-validat2.o cryptest-validat3.o cryptest-datatest.o
cryptest-regtest1.o cryptest-regtest2.o cryptest-regtest3.o
cryptest-dlltest.o cryptest-fipsalgt.o cryptest-adhoc.o libcryptopp.la
/bin/sh ./libtool  --tag=CXX   --mode=link g++ -pthread
-fdata-sections -ffunction-sections -pipe -g -O2 -pthread
-Wl,--gc-sections  -o cryptestcwd.exe cryptestcwd-test.o
cryptestcwd-bench1.o cryptestcwd-bench2.o cryptestcwd-validat0.o
cryptestcwd-validat1.o cryptestcwd-validat2.o cryptestcwd-validat3.o
cryptestcwd-datatest.o cryptestcwd-regtest1.o cryptestcwd-regtest2.o
cryptestcwd-regtest3.o cryptestcwd-dlltest.o cryptestcwd-fipsalgt.o
cryptestcwd-adhoc.o libcryptopp.la
libtool: link: g++ -pthread -fdata-sections -ffunction-sections -pipe
-g -O2 -pthread -Wl,--gc-sections -o .libs/cryptestcwd.exe
cryptestcwd-test.o cryptestcwd-bench1.o cryptestcwd-bench2.o
cryptestcwd-validat0.o cryptestcwd-validat1.o cryptestcwd-validat2.o
cryptestcwd-validat3.o cryptestcwd-datatest.o cryptestcwd-regtest1.o
cryptestcwd-regtest2.o cryptestcwd-regtest3.o cryptestcwd-dlltest.o
cryptestcwd-fipsalgt.o cryptestcwd-adhoc.o  ./.libs/libcryptopp.a
-pthread
libtool: link: g++ -pthread -fdata-sections -ffunction-sections -pipe
-DCRYPTOPP_DATA_DIR=\"@pkgdatadir@/cryptopp/\" -g -O2 -pthread
-Wl,--gc-sections -o .libs/cryptest.exe cryptest-test.o
cryptest-bench1.o cryptest-bench2.o cryptest-validat0.o
cryptest-validat1.o cryptest-validat2.o cryptest-validat3.o
cryptest-datatest.o cryptest-regtest1.o cryptest-regtest2.o
cryptest-regtest3.o cryptest-dlltest.o cryptest-fipsalgt.o
cryptest-adhoc.o  ./.libs/libcryptopp.a -pthread
./.libs/lt-cryptestcwd.c: In function 'main':
./.libs/lt-cryptest.c: In function 'main':
./.libs/lt-cryptestcwd.c:319:16: warning: implicit declaration of
function '_spawnv' [-Wimplicit-function-declaration]
   rval = (int) _spawnv (_P_WAIT, lt_argv_zero, (const char * const *) newargz);
                ^~~~~~~
./.libs/lt-cryptest.c:319:16: warning: implicit declaration of
function '_spawn ' [-Wimplicit-function-declaration]
   rval = (int) _spawnv (_P_WAIT, lt_argv_zero, (const char * const *) newargz);
                ^~~~~~~
/tmp/ccFfsaBb.o: In function `main':
/home/cryptopp/./.libs/lt-cryptest.c:319: undefined reference to `_spawnv'
/home/cryptopp/./.libs/lt-cryptest.c:319:(.text.startup+0x4b4):
relocation truncated to fit: R_X86_64_PC32 against undefined symbol
`_spawnv'
collect2: error: ld returned 1 exit status
/tmp/ccfJfnlw.o: In function `main':
/home/cryptopp/./.libs/lt-cryptestcwd.c:319: undefined reference to `_spawnv'
/home/cryptopp/./.libs/lt-cryptestcwd.c:319:(.text.startup+0x4b4):
relocation truncated to fit: R_X86_64_PC32 against undefined symbol
`_spawnv'
strip: './cryptest.exe': No such file
collect2: error: ld returned 1 exit status
strip: './cryptestcwd.exe': No such file
./libtool: line 11083: ./cryptest.exe: No such file or directory
./libtool: line 11083: ./cryptestcwd.exe: No such file or directory
make[1]: Leaving directory '/home/cryptopp'
...
Acknowledgement sent to noloader@HIDDEN:
New bug report received and forwarded. Copy sent to bug-libtool@HIDDEN. Full text available.
Report forwarded to bug-libtool@HIDDEN:
bug#29298; Package libtool. Full text available.
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