GNU bug report logs - #30913
Releasing a build compatible with glibc-2.26+

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Package: diffutils; Reported by: The Fireplace <the.f1repl4ce@HIDDEN>; dated Fri, 23 Mar 2018 00:42:01 UTC; Maintainer for diffutils is bug-diffutils@HIDDEN.

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From: Bruno Haible <bruno@HIDDEN>
To: Paul Eggert <eggert@HIDDEN>
Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible
 withglibc-2.26+
Date: Wed, 28 Mar 2018 22:45:48 +0200
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Paul Eggert wrote:
> Yes please. Thanks.

Pushed.

Bruno
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

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Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible
 withglibc-2.26+
To: Bruno Haible <bruno@HIDDEN>, bug-gnulib@HIDDEN
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On 03/28/2018 01:40 AM, Bruno Haible wrote:
> ping? OK to commit this fix?

Yes please. Thanks. (Jim had another suggestion which would also work, 
but it hasn't been written yet....)
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

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From: Bruno Haible <bruno@HIDDEN>
To: bug-gnulib@HIDDEN
Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible
 withglibc-2.26+
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Hi Paul,

ping? OK to commit this fix?

Bruno

> Hi Paul,
> 
> > Thanks. I installed the attached patch into Gnulib and committed this 
> > into diffutils.
> 
> I think an additional fix of this is in order:
> 
> diff --git a/lib/c-stack.c b/lib/c-stack.c
> index c309666..9bbe6fe 100644
> --- a/lib/c-stack.c
> +++ b/lib/c-stack.c
> @@ -101,7 +101,7 @@ static char const * volatile stack_overflow_message;
>  
>  #if ((HAVE_LIBSIGSEGV && ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC) \
>       || (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK            \
> -         && HAVE_STACK_OVERFLOW_HANDLING && SIGINFO_WORKS))
> +         && HAVE_STACK_OVERFLOW_HANDLING))
>  
>  /* Output an error message, then exit with status EXIT_FAILURE if it
>     appears to have been a stack overflow, or with a core dump
> 
> 
> Rationale: There's an additional reference to 'die' in line 314,
> with condition
>   HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK && HAVE_STACK_OVERFLOW_HANDLING && !SIGINFO_WORKS
> 
> Bruno
> 
>
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

Message received at 30913 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible
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Hi Paul,

> Thanks. I installed the attached patch into Gnulib and committed this 
> into diffutils.

I think an additional fix of this is in order:

diff --git a/lib/c-stack.c b/lib/c-stack.c
index c309666..9bbe6fe 100644
--- a/lib/c-stack.c
+++ b/lib/c-stack.c
@@ -101,7 +101,7 @@ static char const * volatile stack_overflow_message;
 
 #if ((HAVE_LIBSIGSEGV && ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC) \
      || (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK            \
-         && HAVE_STACK_OVERFLOW_HANDLING && SIGINFO_WORKS))
+         && HAVE_STACK_OVERFLOW_HANDLING))
 
 /* Output an error message, then exit with status EXIT_FAILURE if it
    appears to have been a stack overflow, or with a core dump


Rationale: There's an additional reference to 'die' in line 314,
with condition
  HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK && HAVE_STACK_OVERFLOW_HANDLING && !SIGINFO_WORKS

Bruno
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

Message received at 30913 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#30913: bug#30913: Releasing a build
 compatible withglibc-2.26+
To: Eric Blake <eblake@HIDDEN>
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On Fri, Mar 23, 2018 at 11:50 AM, Eric Blake <eblake@HIDDEN> wrote:
> On 03/23/2018 01:44 PM, Paul Eggert wrote:
>
>>> From 0d111b0de328d31dd3444ceeec977a7aaa5bb0ed Mon Sep 17 00:00:00 2001
>>
>> From: Paul Eggert<eggert@HIDDEN>
>> Date: Fri, 23 Mar 2018 11:26:15 -0700
>> Subject: [PATCH] c-stack: port to recent GCC build
>>
>> Problem reported by The Fireplace (Bug#30913).
>> * lib/c-stack.c (die): Define only if used.
>
>
>> +++ b/lib/c-stack.c
>> @@ -99,6 +99,10 @@ static void (* volatile segv_action) (int);
>>   static char const * volatile program_error_message;
>>   static char const * volatile stack_overflow_message;
>>   +#if ((HAVE_LIBSIGSEGV && ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC) \
>> +     || (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK            \
>> +         && HAVE_STACK_OVERFLOW_HANDLING && SIGINFO_WORKS))
>> +
>
>
> That's a maintenance nightmare to keep the #if conditions in sync. Would it
> not be simpler to just use __attribute__((unused)) on the function
> declaration, to tell the compiler that the function does not get used in all
> setups, but that it should not warn in those cases?

Good point. I think it's safe, these days. At worst,
enable it only for gcc 5.x and newer. Older compilers
should not be used with -Werror.

While not everyone compiles gnulib's regex.c,
I note that it uses the construct via regex_internal.h:

  lib/regex_internal.h:799:static void __attribute__ ((unused))
  lib/regex_internal.h-800-bitset_not (bitset_t set)

with this definition:

  #if __GNUC__ < 3 + (__GNUC_MINOR__ < 1)
  # define __attribute__(arg)
  #endif
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

Message received at 30913 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible
 withglibc-2.26+
To: Eric Blake <eblake@HIDDEN>, The Fireplace <the.f1repl4ce@HIDDEN>
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On 03/23/2018 11:50 AM, Eric Blake wrote:
> Would it not be simpler to just use __attribute__((unused)) on the 
> function declaration

That should work if properly ifdeffed, yes. I didn't do it that way only 
because nobody else in Gnulib is doing it that way and there are 
problems with __attribute__((unused)) in older GCCs that I didn't want 
to do the research on. As I vaguely recall, __attribute__ ((used)) used 
to mean __attribute__ ((unused)), or was it vice versa?
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

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Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible
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To: Paul Eggert <eggert@HIDDEN>, The Fireplace <the.f1repl4ce@HIDDEN>
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From: Eric Blake <eblake@HIDDEN>
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On 03/23/2018 01:44 PM, Paul Eggert wrote:

>>From 0d111b0de328d31dd3444ceeec977a7aaa5bb0ed Mon Sep 17 00:00:00 2001
> From: Paul Eggert<eggert@HIDDEN>
> Date: Fri, 23 Mar 2018 11:26:15 -0700
> Subject: [PATCH] c-stack: port to recent GCC build
> 
> Problem reported by The Fireplace (Bug#30913).
> * lib/c-stack.c (die): Define only if used.

> +++ b/lib/c-stack.c
> @@ -99,6 +99,10 @@ static void (* volatile segv_action) (int);
>   static char const * volatile program_error_message;
>   static char const * volatile stack_overflow_message;
>   
> +#if ((HAVE_LIBSIGSEGV && ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC) \
> +     || (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK            \
> +         && HAVE_STACK_OVERFLOW_HANDLING && SIGINFO_WORKS))
> +

That's a maintenance nightmare to keep the #if conditions in sync. 
Would it not be simpler to just use __attribute__((unused)) on the 
function declaration, to tell the compiler that the function does not 
get used in all setups, but that it should not warn in those cases?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

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Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible
 withglibc-2.26+
To: The Fireplace <the.f1repl4ce@HIDDEN>
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From: Paul Eggert <eggert@HIDDEN>
Organization: UCLA Computer Science Department
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On 03/23/2018 12:32 AM, The Fireplace wrote:
>
> Alright, I=E2=80=99ve tested using the process you described, with my o=
nly=20
> change to it being to add a few needed arguments=20
> <https://paste.ubuntu.com/p/36DRSHvbqw/> for my setup to ./configure.=20
> When I ran make, it ended somewhat quickly, with the following error:
>
> https://paste.ubuntu.com/p/X4s6McxBBd/
>
Thanks. I installed the attached patch into Gnulib and committed this=20
into diffutils. Please try the same procedure again for diffutils.=20
CC'ing bug-gnulib.

> Alright, I=E2=80=99ve finished testing. I found -Werror, but removing i=
t=20
> didn=E2=80=99t seem to work, so I commented out the unused function it =
was=20
> warning me about instead. After doing that, make finished=20
> successfully. However, when running make check, one test failed:
>
> ../build-aux/test-driver: line 107:=C2=A0 6309 Aborted=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=20
> (core dumped) "$@" > $log_file 2>&1
>
> FAIL: test-fcntl
>
> If you need a full log on that, I can get it for you, just tell me=20
> which file you need.
>
gnulib-tests/test-fcntl.log would be the first thing. Also, perhaps you=20
can run the program gnulib-tests/test-fcntl under GDB and see exactly=20
where it crashes.


--------------BEA1B834AE7B55F98848C470
Content-Type: text/x-patch;
 name="0001-c-stack-port-to-recent-GCC-build.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="0001-c-stack-port-to-recent-GCC-build.patch"

From 0d111b0de328d31dd3444ceeec977a7aaa5bb0ed Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@HIDDEN>
Date: Fri, 23 Mar 2018 11:26:15 -0700
Subject: [PATCH] c-stack: port to recent GCC build

Problem reported by The Fireplace (Bug#30913).
* lib/c-stack.c (die): Define only if used.
---
 ChangeLog     | 6 ++++++
 lib/c-stack.c | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 9b8653f78..9839555c7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-03-23  Paul Eggert  <eggert@HIDDEN>
+
+	c-stack: port to recent GCC build
+	Problem reported by The Fireplace (Bug#30913).
+	* lib/c-stack.c (die): Define only if used.
+
 2018-03-20  Bruno Haible  <bruno@HIDDEN>
 
 	euidaccess: Port to native Windows.
diff --git a/lib/c-stack.c b/lib/c-stack.c
index ddb3c939c..c309666fe 100644
--- a/lib/c-stack.c
+++ b/lib/c-stack.c
@@ -99,6 +99,10 @@ static void (* volatile segv_action) (int);
 static char const * volatile program_error_message;
 static char const * volatile stack_overflow_message;
 
+#if ((HAVE_LIBSIGSEGV && ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC) \
+     || (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK            \
+         && HAVE_STACK_OVERFLOW_HANDLING && SIGINFO_WORKS))
+
 /* Output an error message, then exit with status EXIT_FAILURE if it
    appears to have been a stack overflow, or with a core dump
    otherwise.  This function is async-signal-safe.  */
@@ -124,6 +128,7 @@ die (int signo)
   raise (signo);
   abort ();
 }
+#endif
 
 #if (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK \
      && HAVE_STACK_OVERFLOW_HANDLING) || HAVE_LIBSIGSEGV
-- 
2.14.3


--------------BEA1B834AE7B55F98848C470--
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

Message received at 30913 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible with
 glibc-2.26+
To: The Fireplace <the.f1repl4ce@HIDDEN>
References: <5ab44c73.4fd0ca0a.a6e4d.fe87@HIDDEN>
 <1ad2e6d0-fffb-34f2-54d1-4ee26f1adcca@HIDDEN>
 <5ab49670.1c69fb81.5bed4.fc02@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
Organization: UCLA Computer Science Department
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Date: Thu, 22 Mar 2018 23:07:14 -0700
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The Fireplace wrote:
> Exactly, when I attempt to make with glibc-2.27 having been installed b=
efore it, it fails due to the following:
> https://paste.ubuntu.com/p/JvfC3HRSD4/
> After searching the internet for what the issue was, I only found a few=
 results, of which this was the closest, and it points to incompatibility=
 with glibc 2.26.
> If I can provide any additional details, let me know, and I=E2=80=99ll =
get them for you.

Can you build from the latest diffutils source on Savannah? If so, all we=
=20
probably need to do is cut a new release. You'll need build tools. Briefl=
y:

git clone https://git.savannah.gnu.org/git/diffutils.git
cd diffutils
./bootstrap
./configure
make
make check
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

Message received at 30913 <at> debbugs.gnu.org:


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Subject: Re: [bug-diffutils] bug#30913: Releasing a build compatible with
 glibc-2.26+
To: The Fireplace <the.f1repl4ce@HIDDEN>, 30913 <at> debbugs.gnu.org
References: <5ab44c73.4fd0ca0a.a6e4d.fe87@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
Organization: UCLA Computer Science Department
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The Fireplace wrote:
> I would like to use diffutils alongside glibc-2.27, but it seems that t=
he latest release of diffutils doesn=E2=80=99t support it.

What's the problem, exactly?
Information forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.

Message received at submit <at> debbugs.gnu.org:


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--_45EA26A2-EF1D-491F-B56A-833321202301_
Content-Transfer-Encoding: quoted-printable
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Hello,
I would like to use diffutils alongside glibc-2.27, but it seems that the l=
atest release of diffutils doesn=E2=80=99t support it. Is it possible that =
you guys could make a new release or alpha build with the changes that have=
 been made since the last release? As I understand it, the issue has been f=
ixed. I get it if all current changes aren=E2=80=99t tested enough to make =
a full release, but I=E2=80=99m hoping at least an alpha can be made, thoug=
h it looks like none have been made in a while. If neither can be made righ=
t now, if you have any other way for me to solve this compatibility issue, =
I=E2=80=99d love to hear it. I look forward to hearing back from you.
Sincerely,
The_Fireplace


--_45EA26A2-EF1D-491F-B56A-833321202301_
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<html xmlns:o=3D"urn:schemas-microsoft-com:office:office" xmlns:w=3D"urn:sc=
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fice/2004/12/omml" xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta ht=
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72"><div cla=
ss=3DWordSection1><p class=3DMsoNormal>Hello,</p><p class=3DMsoNormal>I wou=
ld like to use diffutils alongside glibc-2.27, but it seems that the latest=
 release of diffutils doesn=E2=80=99t support it. Is it possible that you g=
uys could make a new release or alpha build with the changes that have been=
 made since the last release? As I understand it, <a href=3D"https://patchw=
ork.ozlabs.org/patch/809145/">the issue has been fixed</a>. I get it if all=
 current changes aren=E2=80=99t tested enough to make a full release, but I=
=E2=80=99m hoping at least an alpha can be made, though <a href=3D"http://a=
lpha.gnu.org/gnu/diffutils/">it looks like none have been made in a while</=
a>. If neither can be made right now, if you have any other way for me to s=
olve this compatibility issue, I=E2=80=99d love to hear it. I look forward =
to hearing back from you.</p><p class=3DMsoNormal>Sincerely,</p><p class=3D=
MsoNormal>The_Fireplace</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div>=
</body></html>=

--_45EA26A2-EF1D-491F-B56A-833321202301_--
Acknowledgement sent to The Fireplace <the.f1repl4ce@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-diffutils@HIDDEN. Full text available.
Report forwarded to bug-diffutils@HIDDEN:
bug#30913; Package diffutils. Full text available.
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