https://bugs.llvm.org/show_bug.cgi?id=51308
Bug ID: 51308
Summary: invalid symbol redefinition when -O2 enabled
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Following code can be successfully compiled by O0 optimization on, but not O2.
Example code:
---
#include <stdio.h>
int func() {
int filter;
asm volatile(
" leaq _filter(%%rip), %%rax\n"
" jmp _out\n"
"_filter:\n"
".ascii \"\\040\"\n"
"_out:"
: "=rax"(filter)
:
:);
return filter;
}
int main() {
printf("%#x", func());
return 0;
}
---
Error message:
---
<source>:8:10: error: symbol '_filter' is already defined
"_filter:\n"
^
<inline asm>:3:1: note: instantiated into assembly here
_filter:
^
<source>:10:10: error: symbol '_out' is already defined
"_out:"
^
<inline asm>:5:1: note: instantiated into assembly here
_out:
^
2 errors generated.
ASM generation compiler returned: 1
<source>:8:10: error: symbol '_filter' is already defined
"_filter:\n"
^
<inline asm>:3:1: note: instantiated into assembly here
_filter:
^
<source>:10:10: error: symbol '_out' is already defined
"_out:"
^
<inline asm>:5:1: note: instantiated into assembly here
_out:
^
2 errors generated.
Execution build compiler returned: 1
---
It affects 11.0, 12.0, and trunk.
Trunk O0: https://godbolt.org/z/7afYjhGzc
Trunk O2: https://godbolt.org/z/6K71Tde6s
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