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Bug#1109256: marked as done (libkpathsea-dev: redeclares Standard C functions with incompatible prototype, causing FTBFS elsewhere)

Your message dated Sun, 27 Jul 2025 23:59:36 +0000
with message-id <E1ugBHE-00HZR4-0D@fasolo.debian.org>
and subject line Bug#1109256: fixed in texlive-bin 2025.20250727.75242+ds-1
has caused the Debian Bug report #1109256,
regarding libkpathsea-dev: redeclares Standard C functions with incompatible prototype, causing FTBFS elsewhere
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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1109256: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1109256
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--- Begin Message --- 
Package: libkpathsea-dev
Version: 2024.20240313.70630+ds-6
Severity: important
Tags: ftbfs upstream forky sid
Control: block 1096597 by -1
Control: affects -1 + src:evince

In #1096597, Matthias Klose reported that evince FTBFS with gcc-15 as 
default (it is not the default for trixie, but will become the default 
in forky). This seems to be caused by libkpathsea-dev's headers, 
combined with gcc-15 defaulting to C23.

As an example of the class of issue I'm reporting, libkpathsea-dev's 
c-std.h has this:

>#ifdef HAVE_STDLIB_H
>#include <stdlib.h>
>/* Include <stdlib.h> before <stddef.h>, to help avoid NULL
>   redefinitions on some systems.  (We don't include <stddef.h>
>   ourselves any more, but FYI.)  */
>#else
>/* It's impossible to say for sure what the system will deign to put in
>   <stdlib.h>, but let's hope it's at least this.  */
>extern char *getenv ();
>#endif /* not HAVE_STDLIB_H */

and evince includes <stdlib.h> followed by <kpathsea/c-std.h>.

The code in c-std.h assumes that the build system of every dependent 
package will check for stdlib.h and define HAVE_STDLIB_H if found, but 
there is a tendency to stop doing that, and instead assume that all 
platforms comply with a 1989 C standard by now. In particular Evince 
does not check for <stdlib.h>, and includes it unconditionally (I 
assume).

In C11 or older, `extern char *getenv ()` declares getenv() as a 
function taking unspecified parameters and returning a string, but in 
C23 it declares getenv() as a function taking *no* parameters and 
returning a string, hence the compiler sees this as a declaration that 
is incompatible with the one it already saw in <stdlib.h>, and errors 
out:

>/usr/include/kpathsea/c-std.h:48:14: error: conflicting types for ‘getenv’; have ‘char *(void)’
>   48 | extern char *getenv ();
>      |              ^~~~~~

An equivalent failure mode is seen in the evince build log for other 
Standard C functions like strtok() and strstr(). There might be others, 
I didn't inspect all of the kpathsea headers.

evince could presumably work around this by conditionally or 
unconditionally defining HAVE_STDLIB_H, etc., before it includes 
kpathsea headers; but it shouldn't have to, because each library should 
be self-contained.

I think <kpathsea/c-std.h> should do something more like this 
(pseudo-patch, untested) so that it treats __STDC__ as implying that 
every Standard C header is present:

-#ifdef HAVE_STDLIB_H
+#if defined(__STDC__) || defined(HAVE_STDLIB_H)
 #include <stdlib.h>
...

(or it could check __STDC_VERSION__ if preferred)

... or it could just assume that every platform has Standard C headers 
by now, since C89 is several decades old.

Thanks,
    smcv

--- End Message ---
--- Begin Message --- 
Source: texlive-bin
Source-Version: 2025.20250727.75242+ds-1
Done: Hilmar Preuße <hille42@debian.org>

We believe that the bug you reported is fixed in the latest version of
texlive-bin, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1109256@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Hilmar Preuße <hille42@debian.org> (supplier of updated texlive-bin package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Sun, 27 Jul 2025 23:14:41 +0200
Source: texlive-bin
Architecture: source
Version: 2025.20250727.75242+ds-1
Distribution: experimental
Urgency: medium
Maintainer: Debian TeX Task Force <debian-tex-maint@lists.debian.org>
Changed-By: Hilmar Preuße <hille42@debian.org>
Closes: 991944 1109256
Changes:
 texlive-bin (2025.20250727.75242+ds-1) experimental; urgency=medium
 .
   * New version TL 2025.
     - Contains fix for manual pages (Closes: #991944).
   * Lower C standard to C17. This is assumed to be a workaround for
     #1097988.
   * Remove (incompatible) getenv, strtok & strstr declaration from
     kpathsea headers. (Closes: #1109256).
     https://tug.org/pipermail/tex-live/2025-July/051609.html
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