diff options
Diffstat (limited to 'gcc/configure.ac')
| -rw-r--r-- | gcc/configure.ac | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/gcc/configure.ac b/gcc/configure.ac index 9f67e62..24e0aa6 100644 --- a/gcc/configure.ac +++ b/gcc/configure.ac @@ -4207,6 +4207,35 @@ else [$tls_as_opt], [$conftest_s],, [set_have_as_tls=yes]) fi +case $target_os in + win32 | pe | cygwin* | mingw32*) + if test $set_have_as_tls = yes; then + # Hack to check whether ld breaks on @secrel32 for Windows + if test $in_tree_ld = yes; then + if test "$gcc_cv_gld_major_version" -eq 2 -a "$gcc_cv_gld_minor_version" -ge 44 -o "$gcc_cv_gld_major_version" -gt 2; then + : # ld support for @secrel32 was fixed in this version + else + AC_MSG_ERROR([ld version is known to have broken secrel32 relocations, configure without --enable-tls or with --disable-tls to remove this error. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80881 for more information.]) + fi + elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x; then + echo '.text' > conftest.s + echo 'foo: nop' >> conftest.s + echo '.data' >> conftest.s + echo '.secrel32 foo' >> conftest.s + if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1 && $gcc_cv_ld -o conftest.exe conftest.o > /dev/null; then + if $gcc_cv_objdump -h conftest.exe | grep '\.reloc\>' > /dev/null; then + AC_MSG_ERROR([ld has broken secrel32 relocations, configure without --enable-tls or with --disable-tls to remove this error. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80881 for more information.]) + fi + else + AC_MSG_ERROR([Error occurred while checking for broken secrel32 relocations. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80881 for more information.]) + fi + rm -f conftest.s conftest.o conftest.exe + else + AC_MSG_ERROR([Cannot check for broken secrel32 relocations to determine --enable-tls support. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80881 for more information.]) + fi + fi + ;; +esac if test $set_have_as_tls = yes ; then AC_DEFINE(HAVE_AS_TLS, 1, [Define if your assembler and linker support thread-local storage.]) @@ -4438,6 +4467,15 @@ case "$target" in ldr x0, [[x2, #:gotpage_lo15:globalsym]] ],,[AC_DEFINE(HAVE_AS_SMALL_PIC_RELOCS, 1, [Define if your assembler supports relocs needed by -fpic.])]) + # Check if we have binutils support for AEABI build attributes. + gcc_GAS_CHECK_FEATURE([support of AEABI build attributes], gcc_cv_as_aarch64_aeabi_build_attributes,, + [ + .aeabi_subsection aeabi_feature_and_bits, optional, ULEB128 + .aeabi_attribute Tag_Feature_BTI, 1 + .aeabi_attribute Tag_Feature_PAC, 1 + .aeabi_attribute Tag_Feature_GCS, 1 + ],,[AC_DEFINE(HAVE_AS_AEABI_BUILD_ATTRIBUTES, 1, + [Define if your assembler supports AEABI build attributes.])]) # Enable Branch Target Identification Mechanism and Return Address # Signing by default. AC_ARG_ENABLE(standard-branch-protection, @@ -7934,6 +7972,41 @@ standards-compatible mode on s390 targets.]) ;; esac +# On x86-64, when profiling is enabled with shrink wrapping, the mcount +# call may not be placed at the function entry after +# pushq %rbp +# movq %rsp,%rbp +# As the result, the profile data may be skewed which makes PGO less +# effective: +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120881 +# Enable -mfentry by default on x86-64 to put the profiling counter call +# before the prologue. +AC_ARG_ENABLE(x86-64-mfentry, + [AS_HELP_STRING([--enable-x86-64-mfentry], + [enable -mfentry by default on x86-64 targets])], + [case "${enableval}" in + yes | no | auto) + enable_x86_64_mfentry=$enableval + ;; + *) + AC_MSG_ERROR(['$enable_x86_64_mfentry' is an invalid value for --enable-x86-64-mfentry. Valid choices are 'yes', 'no' and 'auto'.]) + ;; + esac], + [enable_x86_64_mfentry=auto]) + +if test x"$enable_x86_64_mfentry" = xauto; then + case "${target}" in + i?86-*-*gnu* | x86_64-*-*gnu*) + # Enable -mfentry by default with glibc on x86. + enable_x86_64_mfentry=yes + ;; + esac +fi + +gif=`if test x$enable_x86_64_mfentry = xyes; then echo 1; else echo 0; fi` +AC_DEFINE_UNQUOTED(ENABLE_X86_64_MFENTRY, $gif, +[Define to enable -mfentry by default on x86-64.]) + # Check if the linker supports '-z now' ld_now_support=no AC_MSG_CHECKING(linker -z now option) |