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| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | configure.ac | 21 |
2 files changed, 25 insertions, 0 deletions
@@ -1,3 +1,7 @@ +2017-02-09 Mark Wielaard <mark@klomp.org> + + * configure.ac: Add check for adding -D_FORTIFY_SOURCE=2 to CFLAGS. + 2017-01-12 Mark Wielaard <mark@klomp.org> * configure.ac: Define PACKAGE_URL for older autoconf. 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]), |