https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99872
Bug ID: 99872
Summary: [11 Regression] optimizations sometimes lead to
missing asm prefixes
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: critical
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: jyong at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-w64-mingw32
Build: x86_64-pc-linux-gnu
Created attachment 50497
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50497&action=edit
lib32_libmingwex_a-pow.c test case
Compiling with the following command line:
x86_64-w64-mingw32-gcc -O2 -c lib32_libmingwex_a-pow.c -std=gnu99 -m32
Causes an undefined symbols with the wrong asm prefixes to be emitted:
00000000 T ___attribute__pow
00000010 B ___attribute__pow_d
00000008 B ___attribute__pow_x
00000000 B ___attribute__pow_y
00000000 b .bss
00000000 d .data
U ___fpclassify
U _internal_modf
U LC5
U _LC6
00000000 r .rdata
00000000 r .rdata$zzz
U ___signbit
00000000 t .text
Adding -fno-leading-underscore makes the symbols resolved, 32bit Windows code
is supposed to have a leading underscore.
