http://llvm.org/bugs/show_bug.cgi?id=12554
Bug #: 12554
Summary: builtin symbols cannot be renamed using __asm()
contrary to gcc
Product: clang
Version: 3.0
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
GCC allows renaming builtin symbols using __asm() but Clang does not. Minimal
example from glibc's configure script
$ cat conftest.c
extern char *strstr (const char *, const char *) __asm ("my_strstr");
char *foo (const char *a, const char *b)
{
return __builtin_strstr (a, b);
}
$ clang conftest.c -O3 -S -o -|grep my_strstr
$ /usr/bin/gcc conftest.c -O3 -S -o -|grep my_strstr
jmp my_strstr
Supporting this seems necessary to compile glibc.
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