gcc/ChangeLog:

2009-05-28  Dave Korn  <dave.korn.cygwin@gmail.com>

	PR target/37216

	* configure.ac (HAVE_GAS_ALIGNED_COMM):  Add autoconf test and
	macro definition for support of three-operand format aligned
	.comm directive in assembler on cygwin/pe/mingw target OS.
	* configure:  Regenerate.
	* config.in:  Regenerate.

	* config/i386/winnt.c (i386_pe_asm_output_aligned_decl_common):  Use
	aligned form of .comm directive if -mpe-aligned-commons is in effect.
	* config/i386/cygming.opt (-mpe-aligned-commons):  Add new option.

	* doc/invoke.texi (-mpe-aligned-commons):  Document new target option.
	* doc/tm.texi (ASM_OUTPUT_COMMON):  Document zero size commons.

gcc/testsuite/ChangeLog:

2009-05-28  Dave Korn  <dave.korn.cygwin@gmail.com>
            Uros Bizjak  <ubizjak@gmail.com>
            Danny Smith  <dansmister@gmail.com>

	PR target/37216

	* lib/target-supports.exp (check_effective_target_pe_aligned_commons):
	New function.
	* gcc.target/i386/pr37216.c:  New test source file.
	* gcc.dg/compat/struct-layout-1_generate.c (dg_options[]):  No longer
	use -fno-common for testing Cygwin and MinGW targets.



Co-Authored-By: Danny Smith <dansmister@gmail.com>
Co-Authored-By: Uros Bizjak <ubizjak@gmail.com>

From-SVN: r147950