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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/92860] [9/10/11/12 regression] Global flags
 affected by -O settings are clobbered by optimize attribute
Date: Thu, 09 Dec 2021 18:48:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D92860

--- Comment #61 from David Binderman <dcb314 at hotmail dot com> ---
Created attachment 51964
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51964&action=3Dedit
C source code

Command line used to compile file:

/home/dcb/gcc/working.2/./gcc/xgcc -B/home/dcb/gcc/working.2/./gcc/
-B/home/dcb/gcc/results.20211209/x86_64-pc-linux-gnu/bin/
-B/home/dcb/gcc/results.20211209/x86_64-pc-linux-gnu/lib/ -isystem
/home/dcb/gcc/results.20211209/x86_64-pc-linux-gnu/include -isystem
/home/dcb/gcc/results.20211209/x86_64-pc-linux-gnu/sys-include   -fchecking=
=3D1
-g -O3 -march=3Dnative -O2  -g -O3 -march=3Dnative -DIN_GCC    -W -Wall
-Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-error=3Dformat-diag
-Wstrict-prototypes -Wmissing-prototypes -Wno-error=3Dformat-diag
-Wold-style-definition  -isystem ./include  -fpic -mlong-double-80
-DUSE_ELF_SYMVER -fcf-protection -mshstk -g -DIN_LIBGCC2 -fbuilding-libgcc
-fno-stack-protector  -fpic -mlong-double-80 -DUSE_ELF_SYMVER -fcf-protecti=
on
-mshstk -I. -I. -I../.././gcc -I../../../trunk.git/libgcc
-I../../../trunk.git/libgcc/. -I../../../trunk.git/libgcc/../gcc
-I../../../trunk.git/libgcc/../include
-I../../../trunk.git/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS  -DUSE_TLS  -o unwind-dw2.o -MT unwind-dw2.o -MD -MP -MF
unwind-dw2.dep -fexceptions -c ../../../trunk.git/libgcc/unwind-dw2.c
-fvisibility=3Dhidden -DHIDE_EXPORTS=