https://llvm.org/bugs/show_bug.cgi?id=27592
Bug ID: 27592
Summary: __builtin_strcmp in -O0 generates call to
non-#included strcmp
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: hmij...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
$ cat builtin.c
#include <stdio.h>
int main(void){
printf("%d", __builtin_strcmp("asfd", "asdf"));
}
$ clang-3.9 builtin.c -O0
$ objdump -T a.out
a.out: file format elf64-x86-64
DYNAMIC SYMBOL TABLE:
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 printf
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5
__libc_start_main
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 strcmp
0000000000000000 w D *UND* 0000000000000000 __gmon_start__
When compiling with -O1, the strcmp call is no longer there.
I am not sure how serious this is, but given that clang won't allow me to call
strcmp() without #include <string.h>, it's kinda suspicious that it does so
itself.
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