[PATCH v2] AIX visibility

[David Edelsohn <dje dot gcc at gmail dot com>]

This revised patch makes two changes:

1) Fix typo in configure.ac
2) Add AIX visibility support for ASM_WEAKEN_DECL, which does touch
the same code as Linux.

The AIX "weak" support fixes a large number of C++ visibility testcases.

Bootstrapped on powerpc-ibm-aix7.2.0.0.

* configure.ac (.hidden): Change to conftest_s string. Provide string
for AIX assembler.
(gcc_cv_ld_hidden): Yes for AIX.
* configure: Regenerate.

* dwarf2asm.c (USE_LINKONCE_INDIRECT): Don't set for AIX (XCOFF).

* config/rs6000/rs6000-protos.h (rs6000_asm_weaken_decl): Declare
(rs6000_xcoff_asm_output_aligned_decl_common): Declare.
* config/rs6000/xcoff.h (TARGET_ASM_GLOBALIZE_DECL_NAME): Define.
(ASM_OUTPUT_ALIGNED_DECL_COMMON): Define.
(ASM_OUTPUT_ALIGNED_COMMON): Delete.
* config/rs6000/rs6000.c (rs6000_init_builtins): Change clog rename
from #if to if.
(rs6000_xcoff_visibility): New.
(rs6000_xcoff_declare_function_name): Add visibility support.
(rs6000_xcoff_asm_globalize_decl_name): New.
(rs6000_xcoff_asm_output_aligned_decl_common): New.
(rs6000_asm_weaken_decl): New.
(rs6000_code_end): Disable HIDDEN_LINKONCE on XCOFF.
config/rs6000/rs6000.h (ASM_WEAKEN_DECL): Change definition to
reference function.

dwarf2asm.c okay?

Any comments on ASM_WEAKEN_DECL change?

Thanks, David

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