[gcc(refs/users/egallager/heads/autotools-tinkering)] minor configure tweaks for libgcc

[gcc(refs/users/egallager/heads/autotools-tinkering)] minor configure tweaks for libgcc

[Eric Gallager]

https://gcc.gnu.org/g:7e34d13cfdf766c4d2793f7cbda2e3ee330128bb

commit 7e34d13cfdf766c4d2793f7cbda2e3ee330128bb
Author: Eric Gallager <egallager@gcc.gnu.org>
Date:   Sun May 29 01:43:01 2022 -0400

    minor configure tweaks for libgcc

Diff:
---
 libgcc/configure      |  9 +++++----
 libgcc/configure.ac   | 32 ++++++++++++++++----------------
 libgcc/configure.scan | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 20 deletions(-)

diff --git a/libgcc/configure b/libgcc/configure
index 61f3ace2891..ab9ec46d17a 100755
--- a/libgcc/configure
+++ b/libgcc/configure
@@ -1342,7 +1342,7 @@ Optional Features:
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
   --disable-shared        don't provide a shared libgcc
-  --enable-vtable-verify    Enable vtable verification feature
+  --enable-vtable-verify  Enable vtable verification feature
   --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory
   --enable-maintainer-mode
                           enable make rules and dependencies not useful (and
@@ -1364,8 +1364,9 @@ Optional Features:
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
-  --with-target-subdir=SUBDIR      Configuring in a subdirectory for target
-  --with-cross-host=HOST           Configuring with a cross compiler
+  --with-target-subdir=SUBDIR
+                          Configuring in a subdirectory for target
+  --with-cross-host=HOST  Configuring with a cross compiler
   --with-ld               arrange to use the specified ld (full pathname)
   --with-aix-soname=aix|svr4|both
                           shared library versioning (aka "SONAME") variant to
@@ -2653,7 +2654,7 @@ done
 
 # We need awk; bail out if it's missing.
 case ${AWK} in
-  "") as_fn_error $? "can't build without awk, bailing out" "$LINENO" 5 ;;
+  "") as_fn_error $? "cannot build without awk, bailing out" "$LINENO" 5 ;;
 esac
 
 
diff --git a/libgcc/configure.ac b/libgcc/configure.ac
index 2fc9d5d7c93..562da01fe50 100644
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -14,7 +14,7 @@ sinclude(../config/gthr.m4)
 sinclude(../config/sjlj.m4)
 sinclude(../config/cet.m4)
 
-AC_INIT([GNU C Runtime Library], 1.0,,[libgcc])
+AC_INIT([GNU C Runtime Library],[1.0],[],[libgcc])
 AC_CONFIG_SRCDIR([static-object.mk])
 
 # The libgcc should not depend on any header files
@@ -22,12 +22,13 @@ AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
   [m4_divert_text([DEFAULTS],
     [ac_includes_default='/* none */'])])
 
-AC_ARG_WITH(target-subdir,
-[  --with-target-subdir=SUBDIR      Configuring in a subdirectory for target])
-AC_ARG_WITH(cross-host,
-[  --with-cross-host=HOST           Configuring with a cross compiler])
-AC_ARG_WITH(ld,
-[  --with-ld               arrange to use the specified ld (full pathname)])
+AC_ARG_WITH([target-subdir],
+[AS_HELP_STRING([--with-target-subdir=SUBDIR],
+                [Configuring in a subdirectory for target])])
+AC_ARG_WITH([cross-host],
+[AS_HELP_STRING([--with-cross-host=HOST],[Configuring with a cross compiler])])
+AC_ARG_WITH([ld],
+[AS_HELP_STRING([--with-ld],[arrange to use the specified ld (full pathname)])])
 
 if test "${srcdir}" = "."; then
   if test -n "${with_build_subdir}"; then
@@ -49,8 +50,8 @@ AC_SUBST(libgcc_topdir)
 AC_CONFIG_AUX_DIR($libgcc_topdir)
 AC_CONFIG_HEADER(auto-target.h:config.in)
 
-AC_ARG_ENABLE(shared,
-[  --disable-shared        don't provide a shared libgcc],
+AC_ARG_ENABLE([shared],
+[AS_HELP_STRING([--disable-shared],[don't provide a shared libgcc])],
 [
   case $enable_shared in
   yes | no) ;;
@@ -69,7 +70,7 @@ AC_ARG_ENABLE(shared,
 AC_SUBST(enable_shared)
 
 AC_ARG_ENABLE(vtable-verify,
-[  --enable-vtable-verify    Enable vtable verification feature ],
+[AS_HELP_STRING([--enable-vtable-verify],[Enable vtable verification feature])],
 [case "$enableval" in
  yes) enable_vtable_verify=yes ;;
  no)  enable_vtable_verify=no ;;
@@ -133,7 +134,7 @@ AC_SUBST(slibdir)
 # Command-line options.
 # Very limited version of AC_MAINTAINER_MODE.
 AC_ARG_ENABLE([maintainer-mode],
-  [AC_HELP_STRING([--enable-maintainer-mode],
+  [AS_HELP_STRING([--enable-maintainer-mode],
                  [enable make rules and dependencies not useful (and
                   sometimes confusing) to the casual installer])],
   [case ${enable_maintainer_mode} in
@@ -150,7 +151,7 @@ AC_PROG_INSTALL
 AC_PROG_AWK
 # We need awk; bail out if it's missing.
 case ${AWK} in
-  "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
+  "") AC_MSG_ERROR([cannot build without awk, bailing out]) ;;
 esac
 
 AC_CANONICAL_HOST
@@ -270,7 +271,7 @@ GCC_CET_FLAGS(CET_FLAGS)
 AC_SUBST(CET_FLAGS)
 
 AC_ARG_ENABLE([explicit-exception-frame-registration],
-  [AC_HELP_STRING([--enable-explicit-exception-frame-registration],
+  [AS_HELP_STRING([--enable-explicit-exception-frame-registration],
      [register exception tables explicitly at module start, for use
       e.g. for compatibility with installations without PT_GNU_EH_FRAME support])],
 [
@@ -619,8 +620,7 @@ AC_DEFUN([LIBGCC_CHECK_AS_AVX], [
 case "${target}" in
 i[[34567]]86-*-* | x86_64-*-*)
   AC_CACHE_CHECK([if the assembler supports AVX], libgcc_cv_as_avx, [
-    AC_TRY_COMPILE([], [asm("vzeroupper");],
-		   [libgcc_cv_as_avx=yes], [libgcc_cv_as_avx=no])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[asm("vzeroupper");]])],[libgcc_cv_as_avx=yes],[libgcc_cv_as_avx=no])
   ])
   if test x$libgcc_cv_as_avx = xyes; then
     AC_DEFINE(HAVE_AS_AVX, 1, [Define to 1 if the assembler supports AVX.])
@@ -633,7 +633,7 @@ dnl Check if as supports LSE instructions.
 AC_DEFUN([LIBGCC_CHECK_AS_LSE], [
 case "${target}" in
 aarch64*-*-*)
-  AC_CACHE_CHECK([if the assembler supports LSE], libgcc_cv_as_lse, [
+  AC_CACHE_CHECK([if the assembler supports LSE],[libgcc_cv_as_lse],[
     AC_TRY_COMPILE([],
 changequote(,)dnl
 			asm(".arch armv8-a+lse\n\tcas w0, w1, [x2]");
diff --git a/libgcc/configure.scan b/libgcc/configure.scan
new file mode 100644
index 00000000000..5e416710fc6
--- /dev/null
+++ b/libgcc/configure.scan
@@ -0,0 +1,47 @@
+#                                               -*- Autoconf -*-
+# Process this file with autoconf to produce a configure script.
+
+AC_PREREQ([2.69])
+AC_INIT([FULL-PACKAGE-NAME], [VERSION], [BUG-REPORT-ADDRESS])
+AC_CONFIG_SRCDIR([gthr-single.h])
+AC_CONFIG_HEADERS([config.h])
+
+# Checks for programs.
+AC_PROG_CC
+AC_PROG_INSTALL
+AC_PROG_AWK
+AC_PROG_RANLIB
+
+# Checks for libraries.
+
+# Checks for header files.
+AC_CHECK_HEADERS([fcntl.h fenv.h float.h limits.h stddef.h stdint.h stdlib.h string.h sys/param.h unistd.h])
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_CHECK_HEADER_STDBOOL
+AC_C_INLINE
+AC_TYPE_INT16_T
+AC_TYPE_INT32_T
+AC_TYPE_INT64_T
+AC_TYPE_INT8_T
+AC_FUNC_OBSTACK
+AC_TYPE_OFF_T
+AC_TYPE_PID_T
+AC_C_RESTRICT
+AC_TYPE_SIZE_T
+AC_TYPE_UINT16_T
+AC_TYPE_UINT32_T
+AC_TYPE_UINT64_T
+AC_TYPE_UINT8_T
+
+# Checks for library functions.
+AC_FUNC_ALLOCA
+AC_FUNC_ERROR_AT_LINE
+AC_FUNC_FORK
+AC_FUNC_MALLOC
+AC_FUNC_MMAP
+AC_FUNC_REALLOC
+AC_CHECK_FUNCS([atexit clock_gettime floor getcwd getpagesize memmove memset mkdir munmap sqrt strchr strrchr strstr])
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT