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Improve static checking of integer overflow and stack smashing.

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* configure.ac (WARN_CFLAGS): Add -Wstack-protector and
-Wstrict-overflow if using GCC 4.7.2 or later on a platform with
at least 64-bit long int.  This improves static checking on these
platforms, when configured with --enable-gcc-warnings.
This commit is contained in:
Paul Eggert 2012-11-19 15:39:28 -08:00
parent 141462223d
commit 8ea5c4de2a
2 changed files with 24 additions and 3 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2012-11-19 Paul Eggert <eggert@cs.ucla.edu>
Improve static checking of integer overflow and stack smashing.
* configure.ac (WARN_CFLAGS): Add -Wstack-protector and
-Wstrict-overflow if using GCC 4.7.2 or later on a platform with
at least 64-bit long int. This improves static checking on these
platforms, when configured with --enable-gcc-warnings.
2012-11-17 Paul Eggert <eggert@cs.ucla.edu>
Assume POSIX 1003.1-1988 or later for fcntl.h (Bug#12881).

19
configure.ac
View file

@ -717,11 +717,24 @@ else
# <http://lists.gnu.org/archive/html/emacs-diffs/2011-11/msg00265.html>.
nw="$nw -Wshadow"
# The following lines should be removable at some point.
nw="$nw -Wstack-protector"
nw="$nw -Wstrict-overflow"
# The following line should be removable at some point.
nw="$nw -Wsuggest-attribute=pure"
AC_MSG_CHECKING([whether to use -Wstack-protector -Wstrict-overflow])
AC_PREPROC_IFELSE(
[AC_LANG_PROGRAM(
[[#if (1 <= __LONG_MAX__ >> 31 >> 31 \
&& 4 < __GNUC__ + (7 < __GNUC_MINOR__ + (2 <= __GNUC_PATCHLEVEL__)))
/* OK */
#else
#error "Not GCC, or GCC before 4.7.2, or 'long int' has < 64 bits."
#endif
]])],
[AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)
nw="$nw -Wstack-protector"
nw="$nw -Wstrict-overflow"])
gl_MANYWARN_ALL_GCC([ws])
gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
for w in $ws; do