[Bug middle-end/31844] New: Incorrect source locations and number of warnings for unsupported visibility attribute

["davek at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

This testcase:

/gnu $ cat -n vis.cpp
     1  int j2 __attribute__ ((visibility ("hidden")));
     2
     3
     4
     5
     6
     7
     8  int __attribute__ ((visibility ("protected"))) foo (int bar)
     9  {
    10    return bar + 3;
    11  }
    12
    13
    14
    15
    16
    17
    18
    19  int i __attribute__ ((visibility ("hidden")));
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30  int j __attribute__ ((visibility ("default")));
    31
    32
    33

  Produces seemingly mis-located warnings, both on recent trunk:

/gnu $ g++ -S vis.cpp -o vis.asm
vis.cpp: In function 'int foo(int)':
vis.cpp:11: warning: visibility attribute not supported in this configuration;
ignored
vis.cpp: At global scope:
vis.cpp:29: warning: visibility attribute not supported in this configuration;
ignored
vis.cpp:29: warning: visibility attribute not supported in this configuration;
ignored
/gnu $ g++ -v
Using built-in specs.
Target: i686-pc-cygwin
Configured with: /gnu/gcc/gcc/configure --prefix=/gnu/install -v
--enable-languages=c,c++,java
Thread model: single
gcc version 4.3.0 20070421 (experimental)

  ... and the 4.2.0 RC3 tarball:


/gnu $ g++ -S vis.cpp -o vis.asm
vis.cpp: In function 'int foo(int)':
vis.cpp:11: warning: visibility attribute not supported in this configuration;
ignored
vis.cpp: At global scope:
vis.cpp:29: warning: visibility attribute not supported in this configuration;
ignored
vis.cpp:29: warning: visibility attribute not supported in this configuration;
ignored
/gnu $ g++ -v
Using built-in specs.
Target: i686-pc-cygwin
Configured with: /gnu/gcc/rc2/gcc-4.2.0-20070501/configure
--prefix=/gnu/install/bin --with-gmp=/usr --with-mpfr=/usr -v
Thread model: single
gcc version 4.2.0 20070501 (prerelease)

(Wasn't sure which version to file this against)


-- 
           Summary: Incorrect source locations and number of warnings for
                    unsupported visibility attribute
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: davek at gcc dot gnu dot org
 GCC build triplet: i686-pc-cygwin
  GCC host triplet: i686-pc-cygwin
GCC target triplet: i686-pc-cygwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31844