RE: PR 84154: Fix checking -mibt and -mshstk options for control flow protection

["Tsimbalist, Igor V" <igor dot v dot tsimbalist at intel dot com>]

> -----Original Message-----
> From: Paolo Carlini [mailto:paolo.carlini@oracle.com]
> Sent: Wednesday, February 7, 2018 12:46 AM
> To: Tsimbalist, Igor V <igor.v.tsimbalist@intel.com>; gcc-
> patches@gcc.gnu.org
> Cc: Nick Clifton <nickc@redhat.com>; hjl.tools@gmail.com; Uros Bizjak
> <ubizjak@gmail.com>
> Subject: Re: PR 84154: Fix checking -mibt and -mshstk options for control
> flow protection
> 
> Hi,
> 
> on a rather old x86_64-linux machine GCC doesn't build anymore with
> r257414:
> 
> libtool: compile:  /xxx/Gcc/svn-dirs/trunk-build/./gcc/xg++
> -B/xxx/Gcc/svn-dirs/trunk-build/./gcc/ -nostdinc++ -nostdinc++
> -I/xxx/Gcc/svn-dirs/trunk-build/x86_64-pc-linux-gnu/libstdc++-
> v3/include/x86_64-pc-linux-gnu
> -I/xxx/Gcc/svn-dirs/trunk-build/x86_64-pc-linux-gnu/libstdc++-v3/include
> -I/xxx/Gcc/svn-dirs/trunk/libstdc++-v3/libsupc++
> -I/xxx/Gcc/svn-dirs/trunk/libstdc++-v3/include/backward
> -I/xxx/Gcc/svn-dirs/trunk/libstdc++-v3/testsuite/util
> -L/xxx/Gcc/svn-dirs/trunk-build/x86_64-pc-linux-gnu/libstdc++-v3/src
> -L/xxx/Gcc/svn-dirs/trunk-build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
> -L/xxx/Gcc/svn-dirs/trunk-build/x86_64-pc-linux-gnu/libstdc++-
> v3/libsupc++/.libs
> -B/xxx/Gcc/svn-dirs/trunk-build/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
> -B/xxx/Gcc/svn-dirs/trunk-build/x86_64-pc-linux-gnu/libstdc++-
> v3/libsupc++/.libs
> -B/xxx/Gcc/svn-dirs/trunk-install/x86_64-pc-linux-gnu/bin/
> -B/xxx/Gcc/svn-dirs/trunk-install/x86_64-pc-linux-gnu/lib/ -isystem
> /xxx/Gcc/svn-dirs/trunk-install/x86_64-pc-linux-gnu/include -isystem
> /xxx/Gcc/svn-dirs/trunk-install/x86_64-pc-linux-gnu/sys-include
> -DHAVE_CONFIG_H -I. -I../../../trunk/libitm
> -I../../../trunk/libitm/config/linux/x86
> -I../../../trunk/libitm/config/linux -I../../../trunk/libitm/config/x86
> -I../../../trunk/libitm/config/posix
> -I../../../trunk/libitm/config/generic -I../../../trunk/libitm -mrtm
> -Wall -pthread -Werror -fcf-protection -mcet -std=gnu++0x
> -funwind-tables -fno-exceptions -fno-rtti -fabi-version=4 -g -O2
> -D_GNU_SOURCE -MT beginend.lo -MD -MP -MF .deps/beginend.Tpo -c
> ../../../trunk/libitm/beginend.cc  -fPIC -DPIC -o .libs/beginend.o
> In file included from
> /xxx/Gcc/svn-dirs/trunk-build/gcc/include/x86intrin.h:27,
>                   from ../../../trunk/libitm/config/x86/target.h:26,
>                   from ../../../trunk/libitm/libitm_i.h:74,
>                   from ../../../trunk/libitm/barrier.cc:25:
> /xxx/Gcc/svn-dirs/trunk-build/gcc/include/ia32intrin.h:56:28: internal
> compiler error: in ix86_option_override_internal, at config/i386/i386.c:4952
>   #pragma GCC target("sse4.2")

The issue is known and is covered by https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84248. The patch has been posted

https://gcc.gnu.org/ml/gcc-patches/2018-02/msg00276.html

Igor

> Paolo.