re PR middle-end/46674 (Weak alias is mistakenly optimized away)

gcc/ChangeLog:

	PR middle-end/46674
	PR lto/43157
	* target.def (mangle_assembler_name): New target asm_out hook.
	* targhooks.c (default_mangle_assembler_name): Add default hook
	implementation.
	* targhooks.h (default_mangle_assembler_name): Add prototype.
	* lto-symtab.c (lto_symtab_register_decl): Use new hook when
	processing DECL_ASSEMBLER_NAMEs for lto symtabs.
	(lto_symtab_get_resolution): Likewise.
	(lto_cgraph_replace_node): Likewise.
	(lto_symtab_prevailing_decl): Likewise.
	* lto-streamer-out.c (write_symbol): Likewise.
	* doc/tm.texi.in (TARGET_MANGLE_ASSEMBLER_NAME): Add @hook directive.
	* doc/tm.texi: Regenerate.
	* config/i386/cygming.h (TARGET_MANGLE_ASSEMBLER_NAME): Define to
	point at i386_pe_mangle_assembler_name.
	* config/i386/winnt.c (i386_pe_mangle_assembler_name): New function.
	* config/i386/i386-protos.h (i386_pe_mangle_assembler_name): Add
	prototype.

lto-plugin/ChangeLog:

	PR middle-end/46674
	PR lto/43157
	* configure.ac (SYM_STYLE): Don't AC_DEFINE.
	* lto-plugin.c (sym_style): Don't use it; default to ss_none.
	* configure: Regenerate.
	* config.h.in: Likewise.

gcc/testsuite/ChangeLog:

	PR middle-end/46674
	PR lto/43157
	* gcc.dg/pr43157.c: New file.

From-SVN: r167688

5 files changed, 11 insertions, 35 deletions

diff --git a/lto-plugin/ChangeLog b/lto-plugin/ChangeLog
index 305db4e..2dda317 100644
--- a/lto-plugin/ChangeLog
+++ b/lto-plugin/ChangeLog
@@ -1,3 +1,12 @@
+2010-12-10  Dave Korn  <dave.korn.cygwin@gmail.com>
+
+	PR middle-end/46674
+	PR lto/43157
+	* configure.ac (SYM_STYLE): Don't AC_DEFINE.
+	* lto-plugin.c (sym_style): Don't use it; default to ss_none.
+	* configure: Regenerate.
+	* config.h.in: Likewise.
+
 2010-12-06  Dave Korn  <dave.korn.cygwin@gmail.com>
 
 	PR target/40125
diff --git a/lto-plugin/config.h.in b/lto-plugin/config.h.in
index a591ccc..ad003b2 100644
--- a/lto-plugin/config.h.in
+++ b/lto-plugin/config.h.in
@@ -61,9 +61,6 @@
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
 
-/* Default symbol style */
-#undef SYM_STYLE
-
 /* Version number of package */
 #undef VERSION
 
diff --git a/lto-plugin/configure b/lto-plugin/configure
index 12e58e5..495d9e9 100755
--- a/lto-plugin/configure
+++ b/lto-plugin/configure
@@ -10872,24 +10872,6 @@ esac
 
 
 
-# Trying to get this information from gcc's config is tricky.
-case $target in
-  x86_64*-mingw*)
-
-$as_echo "#define SYM_STYLE ss_none" >>confdefs.h
-
-    ;;
-  *-cygwin* | i?86*-mingw* )
-
-$as_echo "#define SYM_STYLE ss_win32" >>confdefs.h
-
-    ;;
-  *)
-
-$as_echo "#define SYM_STYLE ss_none" >>confdefs.h
-
-    ;;
-esac
 ac_fn_c_find_intX_t "$LINENO" "64" "ac_cv_c_int64_t"
 case $ac_cv_c_int64_t in #(
   no|yes) ;; #(
diff --git a/lto-plugin/configure.ac b/lto-plugin/configure.ac
index 67147db..1aba697 100644
--- a/lto-plugin/configure.ac
+++ b/lto-plugin/configure.ac
@@ -9,18 +9,6 @@ AC_SYS_LARGEFILE
 AM_PROG_LIBTOOL
 ACX_LT_HOST_FLAGS
 AC_SUBST(target_noncanonical)
-# Trying to get this information from gcc's config is tricky.
-case $target in
-  x86_64*-mingw*)
-    AC_DEFINE([SYM_STYLE], [ss_none], [Default symbol style])
-    ;;
-  *-cygwin* | i?86*-mingw* )
-    AC_DEFINE([SYM_STYLE], [ss_win32], [Default symbol style])
-    ;;
-  *)
-    AC_DEFINE([SYM_STYLE], [ss_none], [Default symbol style])
-    ;;
-esac
 AC_TYPE_INT64_T
 AC_TYPE_UINT64_T
 AC_HEADER_SYS_WAIT
diff --git a/lto-plugin/lto-plugin.c b/lto-plugin/lto-plugin.c
index 5ca4c9a..ab18f4c 100644
--- a/lto-plugin/lto-plugin.c
+++ b/lto-plugin/lto-plugin.c
@@ -152,10 +152,10 @@ static char debug;
 static char nop;
 static char *resolution_file = NULL;
 
-/* Set by default from configure.ac, but can be overridden at runtime
+/* Not used by default, but can be overridden at runtime
    by using -plugin-opt=-sym-style={none,win32,underscore|uscore}
    (in fact, only first letter of style arg is checked.)  */
-static enum symbol_style sym_style = SYM_STYLE;
+static enum symbol_style sym_style = ss_none;
 
 static void
 check_1 (int gate, enum ld_plugin_level level, const char *text)