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| author | Paul Eggert <eggert@cs.ucla.edu> | 2014-11-11 20:21:48 -0800 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2014-11-11 20:23:00 -0800 |
| commit | cae0ef2fcd4786583cda8e0c283cad79a5d33918 (patch) | |
| tree | b61d9fa240c5eccc52308d339b34fd46359d6696 /configure.ac | |
| parent | 2f3efcdf47b8442fdb31a3c9f08def2d04c80dec (diff) | |
| download | grep-cae0ef2fcd4786583cda8e0c283cad79a5d33918.tar.gz | |
build: port to GCC 4.6.4 + glibc 2.5
On platforms this old, building with _FORTIFY_SOURCE equal to 2
results in duplicate definitions of standard library functions.
Problem reported by Nelson H. F. Beebe.
* configure.ac (_FORTIFY_SOURCE): Sort after GNULIB_PORTCHECK.
By default, do not enable this unless GNULIB_PORTCHECK is defined.
This better matches the original intent, which as I recall was to
enable these extra checks only with --enable-gcc-warnings.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/configure.ac b/configure.ac index 4d069b87..0b548bd4 100644 --- a/configure.ac +++ b/configure.ac @@ -144,14 +144,15 @@ if test "$gl_gcc_warnings" = yes; then AC_SUBST([WARN_CFLAGS]) AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.]) - AH_VERBATIM([FORTIFY_SOURCE], + AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks]) + AH_VERBATIM([GNULIB_PORTCHECK_FORTIFY_SOURCE], [/* Enable compile-time and run-time bounds-checking, and some warnings, without upsetting glibc 2.15+. */ - #if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__ + #if (defined GNULIB_PORTCHECK && !defined _FORTIFY_SOURCE \ + && defined __OPTIMIZE__ && __OPTIMIZE__) # define _FORTIFY_SOURCE 2 #endif ]) - AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks]) # We use a slightly smaller set of warning options for lib/. # Remove the following and save the result in GNULIB_WARN_CFLAGS. |