[llvm-bugs] [Bug 28611] New: pragma weak doesn't work if has more than 1 alias

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28611

            Bug ID: 28611
           Summary: pragma weak doesn't work if has more than 1 alias
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: qshanz at cn.ibm.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

> cat a.c
#pragma weak a = bad
#pragma weak b = bad
#pragma weak c = bad
void bad(int *info ) { *info = 0 ; }

> clang a.c -c
> readelf -sW a.o
   Num:    Value          Size Type    Bind   Vis      Ndx Name
     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 
     1: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS a.c
     2: 0000000000000000    32 FUNC    WEAK   DEFAULT    2 a
     3: 0000000000000000    32 FUNC    GLOBAL DEFAULT    2 bad

Note that, the symbol b and c are missing.

This is gcc behavior:
     8: 0000000000000000    52 FUNC    GLOBAL DEFAULT    1 bad
     9: 0000000000000000    52 FUNC    WEAK   DEFAULT    1 a
    10: 0000000000000000    52 FUNC    WEAK   DEFAULT    1 b
    11: 0000000000000000    52 FUNC    WEAK   DEFAULT    1 c

> clang -v
clang version 3.9.0 (trunk 264998) (llvm/trunk 264997)
Target: powerpc64le-unknown-linux-gnu
Thread model: posix

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