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| author | H.J. Lu <hjl.tools@gmail.com> | 2020-04-28 05:42:34 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-04-28 05:42:50 -0700 |
| commit | eedc73a224df61694fe4802ddec8eb9ad1822f32 (patch) | |
| tree | ec0322655b95f987b4cc5557775e4400d6a8a6dc /config/cet.m4 | |
| parent | 34f6b14ff33e0c64b3a4a1a2cd871df715d69151 (diff) | |
Check whether -fcf-protection=none -Wl,-z,ibt,-z,shstk work first
GCC_CET_HOST_FLAGS uses -Wl,-z,ibt,-z,shstk to check if Linux/x86 host
has Intel CET enabled by introducing an Intel CET violation on purpose.
To avoid false positive, check whether -Wl,-z,ibt,-z,shstk works first.
-fcf-protection=none is added to avoid false negative when -fcf-protection
is enabled by default.
config/
PR bootstrap/94739
* cet.m4 (GCC_CET_HOST_FLAGS): Add -fcf-protection=none to
-Wl,-z,ibt,-z,shstk. Check whether -fcf-protection=none
-Wl,-z,ibt,-z,shstk works first.
libiberty/
PR bootstrap/94739
* configure: Regenerated.
lto-plugin/
PR bootstrap/94739
* configure: Regenerated.
Diffstat (limited to 'config/cet.m4')
| -rw-r--r-- | config/cet.m4 | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/config/cet.m4 b/config/cet.m4 index 8b9e01fd492..ea616b728a9 100644 --- a/config/cet.m4 +++ b/config/cet.m4 @@ -98,9 +98,19 @@ asm ("setssbsy"); ;; esac +save_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -fcf-protection=none" +save_LDFLAGS="$LDFLAGS" +LDFLAGS="$LDFLAGS -Wl,-z,ibt,-z,shstk" +if test x$may_have_cet = xyes; then + # Check whether -fcf-protection=none -Wl,-z,ibt,-z,shstk work. + AC_TRY_LINK( + [],[return 0;], + [may_have_cet=yes], + [may_have_cet=no]) +fi + if test x$may_have_cet = xyes; then - save_LDFLAGS="$LDFLAGS" - LDFLAGS="$LDFLAGS -Wl,-z,ibt,-z,shstk" AC_TRY_RUN([ static void foo (void) @@ -130,7 +140,6 @@ main () ], [have_cet=no], [have_cet=yes]) - LDFLAGS="$save_LDFLAGS" if test x$enable_cet = xno -a x$have_cet = xyes; then AC_MSG_ERROR([Intel CET must be enabled on Intel CET enabled host]) fi @@ -141,4 +150,6 @@ if test x$enable_cet = xyes; then else AC_MSG_RESULT([no]) fi +CFLAGS="$save_CFLAGS" +LDFLAGS="$save_LDFLAGS" ]) |