From 88b531d0323fc1fc4173f1975d6a4f408a096f8b Mon Sep 17 00:00:00 2001 From: liuhongt Date: Thu, 15 Dec 2022 09:38:08 +0800 Subject: [PATCH] x86: Don't add crtfastmath.o for -shared Don't add crtfastmath.o for -shared to avoid changing the MXCSR register when loading a shared library. crtfastmath.o will be used only when building executables. PR target/55522 * config/i386/gnu-user-common.h (GNU_USER_TARGET_MATHFILE_SPEC): Don't add crtfastmath.o for -shared. * doc/invoke.texi (-shared): Add related documentation. --- gcc/config/i386/gnu-user-common.h | 2 +- gcc/doc/invoke.texi | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/gcc/config/i386/gnu-user-common.h b/gcc/config/i386/gnu-user-common.h index cab9be2bfb7c..9910cd64363d 100644 --- a/gcc/config/i386/gnu-user-common.h +++ b/gcc/config/i386/gnu-user-common.h @@ -47,7 +47,7 @@ along with GCC; see the file COPYING3. If not see /* Similar to standard GNU userspace, but adding -ffast-math support. */ #define GNU_USER_TARGET_MATHFILE_SPEC \ - "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ + "%{Ofast|ffast-math|funsafe-math-optimizations:%{!shared:crtfastmath.o%s}} \ %{mpc32:crtprec32.o%s} \ %{mpc64:crtprec64.o%s} \ %{mpc80:crtprec80.o%s}" diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index c7e88e46e283..d8a207976035 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -17693,7 +17693,8 @@ needs to build supplementary stub code for constructors to work. On multi-libbed systems, @samp{gcc -shared} must select the correct support libraries to link against. Failing to supply the correct flags may lead to subtle defects. Supplying them in cases where they are not necessary -is innocuous.} +is innocuous. For x86, crtfastmath.o will not be added when +@option{-shared} is specified. } @item -shared-libgcc @itemx -static-libgcc -- 2.47.2