java-11-openjdk/jdk8259949-allow_cf-protection_on_x86.patch

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diff --git openjdk.orig/make/autoconf/flags-cflags.m4 openjdk/make/autoconf/flags-cflags.m4
--- openjdk.orig/make/autoconf/flags-cflags.m4
+++ openjdk/make/autoconf/flags-cflags.m4
@@ -715,9 +715,21 @@
# CFLAGS PER CPU
if test "x$TOOLCHAIN_TYPE" = xgcc || test "x$TOOLCHAIN_TYPE" = xclang; then
# COMMON to gcc and clang
+ AC_MSG_CHECKING([if $1 is x86])
if test "x$FLAGS_CPU" = xx86; then
- # Force compatibility with i586 on 32 bit intel platforms.
- $1_CFLAGS_CPU="-march=i586"
+ AC_MSG_RESULT([yes])
+ AC_MSG_CHECKING([if control flow protection is enabled by additional compiler flags])
+ if echo "${EXTRA_CFLAGS}${EXTRA_CXXFLAGS}${EXTRA_ASFLAGS}" | ${GREP} -q 'fcf-protection' ; then
+ # cf-protection requires CMOV and thus i686
+ $1_CFLAGS_CPU="-march=i686"
+ AC_MSG_RESULT([yes, forcing ${$1_CFLAGS_CPU}])
+ else
+ # Force compatibility with i586 on 32 bit intel platforms.
+ $1_CFLAGS_CPU="-march=i586"
+ AC_MSG_RESULT([no, forcing ${$1_CFLAGS_CPU}])
+ fi
+ else
+ AC_MSG_RESULT([no])
fi
fi