* doc/tm.texi (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): Document.
(ASM_OUTPUT_BSS): Describe the two ways of handling global BSS,
and say that only one is needed.
* doc/rtl.texi (SYMBOL_REF_BLOCK): Say that the block can be null.
* target.h (have_switchable_bss_sections): New hook.
* explow.c (use_anchored_address): Check that the symbol is in a block.
* varasm.c (tls_comm_section, comm_section, lcomm_section)
(bss_noswitch_section): New variables.
(get_unnamed_section): Add SECTION_UNNAMED to the flags.
(get_noswitch_section): New function.
(get_block_for_section): Allow SECT to be null.
(unlikely_text_section_p): Use SECTION_STYLE.
(bss_initializer_p): New function.
(get_variable_section): Move earlier in file. Take a new argument,
prefer_noswitch_p. Move bss checks from assemble_variable to here.
Return one of the new *_sections in such cases.
(get_block_for_decl): New function, extracting some logic from
use_blocks_for_decl_p.
(change_symbol_section): Remove in favor of...
(change_symbol_block): ...this new function.
(use_blocks_for_decl_p): Remove checks now performed by
get_block_for_decl.
(make_decl_rtl): Use change_symbol_block and get_block_for_decl.
(ASM_EMIT_LOCAL, ASM_EMIT_BSS, ASM_EMIT_COMMON): Delete in favor of...
(emit_local, emit_bss, emit_common): ...these new functions.
Return true if the alignment was honored.
(emit_tls_common): New function.
(asm_emit_uninitialised): Delete.
(assemble_variable_noswitch): New function, split out from...
(assemble_variable): ...here. Don't make decisions about common
variables here. Globalize all public decls that go into non-common
sections. Check whether SYMBOL_REF_BLOCK is null.
(output_constant_def_contents): Check whether SYMBOL_REF_BLOCK is null.
(output_constant_pool): Likewise.
(init_varasm_once): Initialize the new section variables.
(have_global_bss_p): New function.
(categorize_decl_for_section): Use bss_initializer_p.
(switch_to_section): Use SECTION_STYLE. Abort for SECTION_NOSWITCH.
(place_block_symbol): Assert that the symbol must be in a block.
* target-def.h (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): New macro.
(TARGET_INITIALIZER): Include it.
* rtl.h (SYMBOL_REF_BLOCK): Document the null alternative.
* output.h (SECTION_STYLE_MASK, SECTION_COMMON): New macros.
(SECTION_MACH_DEP): Bump by two.
(SECTION_UNNAMED, SECTION_NOSWITCH): New macros.
(unnamed_section): Mention SECTION_UNNAMED in comment.
(named_section): Likewise SECTION_NAMED.
(noswitch_section_callback): New type.
(noswitch_section): New structure.
(section): Add a noswitch_section alternative.
(SECTION_STYLE): New macro.
(tls_comm_section, comm_section, lcomm_section): Declare.
(bss_noswitch_section, have_global_bss_p): Declare.
* config/elfos.h (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): Override.
* config/iq2000/iq2000.c (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS):
Override.
* config/v850/v850.c (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): Override.
* config/stormy16/stormy16.c (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS):
Override.
cp/
* decl.c (start_decl): Use have_global_bss_p when deciding
whether to make the decl common.
ada/
* utils.c (create_var_decl): Use have_global_bss_p when deciding
whether to make the decl common.
From-SVN: r111644
