https://bugs.llvm.org/show_bug.cgi?id=37065
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Bug ID: 37065
Summary: .symver directive not properly handled with -flto=thin
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Driver
Assignee: unassignedclangb...@nondot.org
Reporter: thomasander...@google.com
CC: llvm-bugs@lists.llvm.org
clang version 7.0.0 (trunk 328716)
Using .symver to bind an imported symbol to a specific version causes problems
with LTO. The symbol with the version appears to be defined when it shouldn't
be. This causes a build failure when linking multiple bitcode files that both
want to import the symbol as now the symbol is duplicated.
$ cat test.c
#include <math.h>
__asm__(".symver exp2f, exp2f@GLIBC_2.2.5");
float test(float f) {
return exp2f(f);
}
$ clang test.c -c -o test.o
$ nm test.o | grep exp2f
U exp2f@GLIBC_2.2.5
$ clang test.c -c -o test.o -flto=thin
$ llvm-nm-5.0 test.o | grep exp2f
U exp2f
U exp2f
---------------- T exp2f@GLIBC_2.2.5
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