diff options
| author | Mark Wielaard <mark@klomp.org> | 2017-02-09 21:09:54 +0100 |
|---|---|---|
| committer | Mark Wielaard <mark@klomp.org> | 2017-02-14 10:39:51 +0100 |
| commit | 01b994e3e6ccb8e79d04a8f6fd10719fac8ff5b8 (patch) | |
| tree | 1a2698b4b8dbdc6381a5e172929d047ab36d1ddd /configure.ac | |
| parent | f9971cb422df39adea7e8c7e22689b879e39c626 (diff) | |
Add -D_FORTIFY_SOURCE=2 to CFLAGS if possible.
Some distros now add -D_FORTIFY_SOURCE=2 by default and we have missed
some issues in the past caught by it. Add it to CFLAGS if possible.
The configure check will make sure that it doesn't conflict with any
other CFLAGS already defined.
Signed-off-by: Mark Wielaard <mark@klomp.org>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 07ad592f..46055f26 100644 --- a/configure.ac +++ b/configure.ac @@ -159,6 +159,27 @@ AC_CACHE_CHECK([whether fts.h is bad when included (with LFS)], ac_cv_bad_fts, ac_cv_bad_fts=no, ac_cv_bad_fts=yes)]) AS_IF([test "x$ac_cv_bad_fts" = "xyes"], [CFLAGS="$CFLAGS -DBAD_FTS=1"]) +# See if we can add -D_FORTIFY_SOURCE=2. Don't do it if it is already +# (differently) defined or if it generates warnings/errors because we +# don't use the right optimisation level (string.h will warn about that). +AC_MSG_CHECKING([whether to add -D_FORTIFY_SOURCE=2 to CFLAGS]) +case "$CFLAGS" in + *-D_FORTIFY_SOURCE=2*) + AC_MSG_RESULT([no, already there]) + ;; + *) + save_CFLAGS="$CFLAGS" + CFLAGS="-D_FORTIFY_SOURCE=2 -Werror $CFLAGS" + AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ + #include <string.h> + int main() { return 0; } + ]])], [ AC_MSG_RESULT([yes]) + CFLAGS="-D_FORTIFY_SOURCE=2 $save_CFLAGS" ], + [ AC_MSG_RESULT([no]) + CFLAGS="$save_CFLAGS"]) + ;; +esac + dnl enable debugging of branch prediction. AC_ARG_ENABLE([debugpred], AS_HELP_STRING([--enable-debugpred],[build binaries with support to debug branch prediction]), |