configure.in: Check whether assembler supports section merging.

	* configure.in: Check whether assembler supports section merging.
	* config.in: Rebuilt.
	* configure: Rebuilt.
	* varasm.c (variable_section, output_constant_pool): Pass alignment
	to SELECT_SECTION and SELECT_RTX_SECTION.
	(mergeable_string_section): New.
	(mergeable_constant_section): New.
	(default_elf_asm_named_section): Output SECTION_MERGE and
	SECTION_STRINGS flags plus SECTION_ENTSIZE entity size.
	* output.h (mergeable_string_section): New.
	(mergeable_constant_section): New.
	(SECTION_MERGE, SECTION_STRINGS, SECTION_ENTSIZE): Define.
	* toplev.c (flag_merge_constants): New.
	(f_options): Add -fmerge-constants and -fmerge-all-constants
	options.
	(toplev_main): Default to -fno-merge-constants if not optimizing.
	* flags.h (flag_merge_constants): Add extern.
	* invoke.texi (-fmerge-constants, -fmerge-all-constants): Document.
	* tm.texi (SELECT_SECTION, SELECT_RTX_SECTION): Document added third
	argument.
	* config/elfos.h (ASM_SECTION_START_OP, ASM_OUTPUT_SECTION_START):
	Define if assembler has working .subsection -1 support.
	(SELECT_RTX_SECTION, SELECT_SECTION): Add third macro argument.
	Put constant into special SHF_MERGE sections if the linker should
	attempt to merge duplicates.
	* config/ia64/sysv4.h (SELECT_RTX_SECTION, SELECT_SECTION): Add third
	macro argument.
	Put constant into special SHF_MERGE sections if the linker should
	attempt to merge duplicates.
	* config/alpha/elf.h: Likewise.
	(ASM_SECTION_START_OP, ASM_OUTPUT_SECTION_START): Define if assembler
	has working .subsection -1 support.
	* config/nextstep.h: Add third argument to SELECT_RTX_SECTION and
	SELECT_SECTION.
	* config/svr3.h: Likewise.
	* config/darwin.h: Likewise.
	* config/arm/aof.h: Likewise.
	* config/arm/linux-elf.h: Likewise.
	* config/avr/avr.h: Likewise.
	* config/c4x/c4x.h: Likewise.
	* config/d30v/d30v.h: Likewise.
	* config/i386/dgux.h: Likewise.
	* config/i386/osfrose.h: Likewise.
	* config/i386/sco5.h: Likewise.
	* config/i386/svr3gas.h: Likewise.
	* config/ia64/aix.h: Likewise.
	* config/m32r/m32r.h: Likewise.
	* config/m68k/m68k.h: Likewise.
	* config/m88k/dgux.h: Likewise.
	* config/m88k/m88k.h: Likewise.
	* config/mcore/mcore-pe.h: Likewise.
	* config/mips/mips.h: Likewise.
	* config/pa/pa.h: Likewise.
	* config/pa/pa-linux.h: Likewise.
	* config/romp/romp.h: Likewise.
	* config/rs6000/sysv4.h: Likewise.
	* config/rs6000/xcoff.h: Likewise.
	* config/s390/linux.h: Likewise.
	* config/sparc/sparc.h: Likewise.
	* config/sparc/sysv4.h: Likewise.
	* config/stormy16/stormy16.h: Likewise.
	* config/v850/v850.h: Likewise.
	* config/vax/vms.h: Likewise.
	* config/arm/arm.c (arm_elf_asm_named_section): Output SECTION_MERGE
	and SECTION_STRINGS flags plus SECTION_ENTSIZE entity size.
	* config/sparc/sparc.c (sparc_elf_asm_named_section): Use
	default_elf_asm_named_section for SHF_MERGE sections.

	* com.c (ffe_init_options): Default to -fmerge-all-constants
	if optimizing.

From-SVN: r45548

1 files changed, 21 insertions, 8 deletions

diff --git a/gcc/output.h b/gcc/output.h
index 2edfb05..f1722f1 100644
--- a/gcc/output.h
+++ b/gcc/output.h
@@ -207,6 +207,15 @@ extern void function_section		PARAMS ((tree));
 /* Tell assembler to switch to the section for the exception table.  */
 extern void exception_section		PARAMS ((void));
 
+/* Tell assembler to switch to the section for string merging.  */
+extern void mergeable_string_section	PARAMS ((tree, unsigned HOST_WIDE_INT,
+						 unsigned int));
+
+/* Tell assembler to switch to the section for constant merging.  */
+extern void mergeable_constant_section	PARAMS ((enum machine_mode,
+						 unsigned HOST_WIDE_INT,
+						 unsigned int));
+
 /* Declare DECL to be a weak symbol.  */
 extern void declare_weak		PARAMS ((tree));
 #endif /* TREE_CODE */
@@ -450,14 +459,18 @@ extern void default_function_pro_epilogue PARAMS ((FILE *, HOST_WIDE_INT));
 extern void no_asm_to_stream PARAMS ((FILE *));
 
 /* Flags controling properties of a section.  */
-#define SECTION_CODE	    1	/* contains code */
-#define SECTION_WRITE	    2	/* data is writable */
-#define SECTION_DEBUG	    4	/* contains debug data */
-#define SECTION_LINKONCE    8	/* is linkonce */
-#define SECTION_SMALL	   16	/* contains "small data" */
-#define SECTION_BSS	   32	/* contains zeros only */
-#define SECTION_FORGET	   64	/* forget that we've entered the section */
-#define SECTION_MACH_DEP  128	/* subsequent bits reserved for target */
+#define SECTION_ENTSIZE	 0x000ff	/* entity size in section */
+#define SECTION_CODE	 0x00100	/* contains code */
+#define SECTION_WRITE	 0x00200	/* data is writable */
+#define SECTION_DEBUG	 0x00400	/* contains debug data */
+#define SECTION_LINKONCE 0x00800	/* is linkonce */
+#define SECTION_SMALL	 0x01000	/* contains "small data" */
+#define SECTION_BSS	 0x02000	/* contains zeros only */
+#define SECTION_FORGET	 0x04000	/* forget that we've entered the section */
+#define SECTION_MERGE	 0x08000	/* contains mergeable data */
+#define SECTION_STRINGS  0x10000	/* contains zero terminated strings without
+					   embedded zeros */
+#define SECTION_MACH_DEP 0x20000	/* subsequent bits reserved for target */
 
 extern unsigned int get_named_section_flags PARAMS ((const char *));
 extern bool set_named_section_flags	PARAMS ((const char *, unsigned int));