Bug 48696 - asprintf not defined
Summary: asprintf not defined
Alias: None
Product: xorg
Classification: Unclassified
Component: App/xmodmap (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Alan Coopersmith
QA Contact: Xorg Project Team
Depends on:
Reported: 2012-04-14 14:22 UTC by Dominique Leuenberger
Modified: 2012-04-30 15:50 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

#define _GNU_SOURCE (293 bytes, patch)
2012-04-14 14:22 UTC, Dominique Leuenberger
no flags Details | Splinter Review
0001-include-config.h-before-stdio.h-other-system-headers.patch (1.29 KB, patch)
2012-04-23 07:30 UTC, Alan Coopersmith
no flags Details | Splinter Review

Description Dominique Leuenberger 2012-04-14 14:22:05 UTC
Created attachment 59986 [details] [review]
#define _GNU_SOURCE

While building xmodmap 1.0.6, I ran into this build error:

gcc -std=gnu99 -DHAVE_CONFIG_H -I.    -Wall -Wpointer-arith -Wmissing-declarations -Wformat=2 -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wbad-function-cast -Wold-style-definition -Wdeclaration-after-statement -Wunused -Wuninitialized -Wshadow -Wcast-qual -Wmissing-noreturn -Wmissing-format-attribute -Wredundant-decls -Werror=implicit -Werror=nonnull -Werror=init-self -Werror=main -Werror=missing-braces -Werror=sequence-point -Werror=return-type -Werror=trigraphs -Werror=array-bounds -Werror=write-strings -Werror=address -Werror=int-to-pointer-cast -Werror=pointer-to-int-cast -fno-strict-aliasing  -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -c xmodmap.c
xmodmap.c: In function 'main':
xmodmap.c:247:5: error: implicit declaration of function 'asprintf' [-Werror=implicit-function-declaration]
xmodmap.c:247:5: warning: nested extern declaration of 'asprintf' [-Wnested-externs]
cc1: some warnings being treated as errors

As per asprintf man page:
       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <stdio.h>

       int asprintf(char **strp, const char *fmt, ...);

       int vasprintf(char **strp, const char *fmt, va_list ap);

=> Adding #define _GNU_SOURCE fixes the build.
Comment 1 Alan Coopersmith 2012-04-14 14:45:46 UTC
http://patchwork.freedesktop.org/patch/9923/ submitted for review
letting autoconf pick the right #define for the platform, since not
all of X.Org's supported platforms use/require _GNU_SOURCE for that.
Comment 2 Alan Coopersmith 2012-04-17 16:47:48 UTC
Fix pushed to git master.
Comment 3 Vincent Untz 2012-04-23 01:01:28 UTC
The committed fix didn't help, I still get the same error with xmodmap 1.0.7.
Comment 4 Alan Coopersmith 2012-04-23 07:30:54 UTC
Created attachment 60482 [details] [review]

Seems like something is different with your build setup then, since no other
Linux user, nor the Linux tinderboxes, are reporting any such problem.

However, I do see there could be an ordering problem, as configure now 
generates config.h to include:

/* Enable GNU extensions on systems that have them.  */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE 1

But xmodmap.c doesn't include config.h directly, instead gets it via
xmodmap.h which is loaded after stdio.h - the attached patch should
correct it.

I'm not going to bother pushing/releasing this until you test & confirm
first though.
Comment 5 Dominique Leuenberger 2012-04-29 14:57:41 UTC
(In reply to comment #4)
> Created attachment 60482 [details] [review] [review]
> 0001-include-config.h-before-stdio.h-other-system-headers.patch

I made a test build with this patch attached (and one more without):
- Without patch: fails (as expected)
- With patch: Build succeeds.

So from my PoV, this looks fine as a solution as well.
Comment 6 Alan Coopersmith 2012-04-30 15:50:27 UTC
Thanks, fix pushed to git master.

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