[LLVMbugs] [Bug 22830] New: function alias via __asm__ is not honored if the alias is defined after the call (gcc behaves differently)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22830

            Bug ID: 22830
           Summary: function alias via __asm__ is not honored if the alias
                    is defined after the call (gcc behaves differently)
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: kcc at google.com
                CC: llvmbugs at cs.uiuc.edu, roland at hack.frob.com
    Classification: Unclassified

I don't know whether this is something that needs to be fixed in Clang,
but at least I want to document this incompatibility with GCC in form of a bug. 

% cat b.c 
extern void FOO();
void call() { FOO(); }
extern __typeof (FOO) FOO __asm__ ("BAR") ;

% gcc b.c -c && nm b.o
                 U BAR        <<<<<<<<<<<<<<<<
0000000000000000 T call

% clang  b.c -c && nm b.o
0000000000000000 T call
                 U FOO        <<<<<<<<<<<<<<<<
% 

This is minimized from glibc sources where FOO=strtol.
Most likely it's easier to fix this in glibc than to support it in Clang.

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