* config.h.in (USE_MULTIARCH): Define.

	* configure.in: Handle --enable-multi-arch.
	* elf/dl-runtime.c (_dl_fixup): Handle STT_GNU_IFUNC.
	(_dl_fixup_profile): Likewise.
	* elf/do-lookup.c (dl_lookup_x): Likewise.
	* sysdeps/x86_64/dl-machine.h: Handle STT_GNU_IFUNC.
	* elf/elf.h (STT_GNU_IFUNC): Define.
	* include/libc-symbols.h (libc_ifunc): Define.
	* sysdeps/x86_64/cacheinfo.c: If USE_MULTIARCH is defined, use the
	framework in init-arch.h to get CPUID values.
	* sysdeps/x86_64/multiarch/Makefile: New file.
	* sysdeps/x86_64/multiarch/init-arch.c: New file.
	* sysdeps/x86_64/multiarch/init-arch.h: New file.
	* sysdeps/x86_64/multiarch/sched_cpucount.c: New file.

	* config.make.in (experimental-malloc): Define.
	* configure.in: Handle --enable-experimental-malloc.
	* malloc/Makefile: Handle experimental-malloc flag.
	* malloc/malloc.c: Implement PER_THREAD and ATOMIC_FASTBINS features.
	* malloc/arena.c: Likewise.
	* malloc/hooks.c: Likewise.
	* malloc/malloc.h: Define M_ARENA_TEST and M_ARENA_MAX.

1 files changed, 42 insertions, 1 deletions

diff --git a/configure.in b/configure.in
index d7b22f3a3b..4015722d5a 100644
--- a/configure.in
+++ b/configure.in
@@ -254,6 +254,24 @@ AC_ARG_ENABLE([all-warnings],
 	      [])
 AC_SUBST(all_warnings)
 
+AC_ARG_ENABLE([multi-arch],
+	      AC_HELP_STRING([--enable-multi-arch],
+			     [enable single DSO with optimizations for multiple architectures]),
+	      [multi_arch=$enableval],
+	      [multi_arch=no])
+if test x"$multi_arch" = xyes; then
+  AC_DEFINE(USE_MULTIARCH)
+  multi_arch_d=/multiarch
+fi
+AC_SUBST(multi_arch)
+
+AC_ARG_ENABLE([experimental-malloc],
+	      AC_HELP_STRING([--enable-experimental-malloc],
+			     [enable experimental malloc features]),
+	      [experimental_malloc=$enableval],
+	      [])
+AC_SUBST(experimental_malloc)
+
 AC_CANONICAL_HOST
 
 # The way shlib-versions is used to generate soversions.mk uses a
@@ -608,7 +626,7 @@ for b in $base ''; do
       test "$v" = / && continue
       for o in /$ostry ''; do
 	test "$o" = / && continue
-	for m in $mach ''; do
+	for m in $multi_arch_d $mach ''; do
 	  for d in $add_ons_pfx ''; do
 	    for a in $add_ons_sfx ''; do
 	      if test -n "$m0$m0sub$b$v$o$m$msub"; then
@@ -1157,6 +1175,29 @@ if test "x$libc_cv_asm_type_prefix" != xno; then
   AC_DEFINE_UNQUOTED(ASM_TYPE_DIRECTIVE_PREFIX, ${libc_cv_asm_type_prefix})
 fi
 
+# For the multi-arch option we need support in the assembler.
+if test "$multi_arch" = yes; then
+  if test "x$libc_cv_asm_type_prefix" != xno; then
+AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support],
+               libc_cv_asm_gnu_indirect_function, [dnl
+cat > conftest.s <<EOF
+.type foo,%gnu_indirect_function
+EOF
+if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD;
+then
+  libc_cv_asm_gnu_indirect_function=yes
+else
+  libc_cv_asm_gnu_indirect_function=no
+fi
+rm -f conftest*])
+  else
+    libc_cv_asm_gnu_indirect_function=no
+  fi
+  if test x"$libc_cv_asm_gnu_indirect_function" != xyes; then
+    AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
+  fi
+fi
+
 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
 [cat > conftest.s <<EOF
 ${libc_cv_dot_text}