libstdc++: Fix and simplify freestanding configuration [PR103866]

This fixes the --disable-hosted-libstdcxx build so that it works with
--without-headers. Currently you need to also use --with-newlib, which
is confusing for users who aren't actually using newlib.

The AM_PROG_LIBTOOL checks are currently skipped for --with-newlib and
--with-avrlibc builds, with this change they are also skipped when using
--without-headers.  It would be nice if using --disable-hosted-libstdcxx
automatically skipped those checks, but GLIBCXX_ENABLE_HOSTED comes too
late to make the AM_PROG_LIBTOOL checks depend on $is_hosted.

The checks for EOF, SEEK_CUR etc. cause the build to fail if there is no
<stdio.h> available.  Unlike most headers, which get a HAVE_FOO_H macro,
<stdio.h> is in autoconf's default includes, so every check tries to
include it unconditionally. This change skips those checks for
freestanding builds.

Similarly, the checks for <stdint.h> types done by GCC_HEADER_STDINT try
to include <stdio.h> and fail for --without-headers builds. This change
skips the use of GCC_HEADER_STDINT for freestanding. We can probably
stop using GCC_HEADER_STDINT entirely, since only one file uses the
gstdint.h header that is generated, and that could easily be changed to
use <stdint.h> instead. That can wait for stage 1.

We also need to skip the GLIBCXX_CROSSCONFIG stage if --without-headers
was used, since we don't have any of the functions it deals with.

The end result of the changes above is that it should not be necessary
for a --disable-hosted-libstdcxx --without-headers build to also use
--with-newlib.

Finally, compile libsupc++ with -ffreestanding when --without-headers is
used, so that <stdint.h> will use <gcc-stdint.h> instead of expecting it
to come from libc.

libstdc++-v3/ChangeLog:

	PR libstdc++/103866
	* acinclude.m4 (GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS): Do
	nothing for freestanding builds.
	(GLIBCXX_ENABLE_HOSTED): Define FREESTANDING_FLAGS.
	* configure.ac: Do not use AC_LIBTOOL_DLOPEN when configured
	with --without-headers.  Do not use GCC_HEADER_STDINT for
	freestanding builds.
	* libsupc++/Makefile.am (HOSTED_CXXFLAGS): Use -ffreestanding
	for freestanding builds.
	* configure: Regenerate.
	* Makefile.in: Regenerate.
	* doc/Makefile.in: Regenerate.
	* include/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.in: Regenerate.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++20/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/filesystem/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

17 files changed, 56 insertions, 14 deletions

diff --git a/libstdc++-v3/Makefile.in b/libstdc++-v3/Makefile.in
index a1955dd..150e4d0 100644
--- a/libstdc++-v3/Makefile.in
+++ b/libstdc++-v3/Makefile.in
@@ -240,6 +240,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 635168d..b770d5b 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -2081,6 +2081,7 @@ dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
 dnl
 AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
 
+if test "$is_hosted" = yes; then
   AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
   AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
 		 [#include <stdio.h>],
@@ -2104,6 +2105,7 @@ AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
   ])
   AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
 		     [Define to the value of the SEEK_END integer constant.])
+fi
 ])
 
 dnl
@@ -2923,12 +2925,16 @@ AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
 	    enable_hosted_libstdcxx=yes
 	    ;;
      esac])
+  freestanding_flags=
   if test "$enable_hosted_libstdcxx" = no; then
     AC_MSG_NOTICE([Only freestanding libraries will be built])
     is_hosted=no
     hosted_define=0
     enable_abi_check=no
     enable_libstdcxx_pch=no
+    if test "x$with_headers" = xno; then
+      freestanding_flags="-ffreestanding"
+    fi
   else
     is_hosted=yes
     hosted_define=1
@@ -2936,6 +2942,8 @@ AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
   GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
   AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
     [Define to 1 if a full hosted library is built, or 0 if freestanding.])
+  FREESTANDING_FLAGS="$freestanding_flags"
+  AC_SUBST(FREESTANDING_FLAGS)
 ])
 
 
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index b1a0157..0f29186 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -771,6 +771,7 @@ thread_header
 glibcxx_PCHFLAGS
 GLIBCXX_BUILD_PCH_FALSE
 GLIBCXX_BUILD_PCH_TRUE
+FREESTANDING_FLAGS
 GLIBCXX_HOSTED_FALSE
 GLIBCXX_HOSTED_TRUE
 glibcxx_compiler_shared_flag
@@ -5949,7 +5950,9 @@ $as_echo "$as_me: OS config directory is $os_include_dir" >&6;}
 
 
 # Libtool setup.
-if test "x${with_newlib}" != "xyes" && test "x${with_avrlibc}" != "xyes"; then
+if test "x${with_newlib}" != "xyes" &&
+    test "x${with_avrlibc}" != "xyes" &&
+    test "x$with_headers" != "xno"; then
   enable_dlopen=yes
 
 
@@ -12176,7 +12179,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12179 "configure"
+#line 12182 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12282,7 +12285,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12285 "configure"
+#line 12288 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -15623,6 +15626,7 @@ else
      esac
 fi
 
+  freestanding_flags=
   if test "$enable_hosted_libstdcxx" = no; then
     { $as_echo "$as_me:${as_lineno-$LINENO}: Only freestanding libraries will be built" >&5
 $as_echo "$as_me: Only freestanding libraries will be built" >&6;}
@@ -15630,6 +15634,9 @@ $as_echo "$as_me: Only freestanding libraries will be built" >&6;}
     hosted_define=0
     enable_abi_check=no
     enable_libstdcxx_pch=no
+    if test "x$with_headers" = xno; then
+      freestanding_flags="-ffreestanding"
+    fi
   else
     is_hosted=yes
     hosted_define=1
@@ -15640,6 +15647,8 @@ cat >>confdefs.h <<_ACEOF
 #define _GLIBCXX_HOSTED $hosted_define
 _ACEOF
 
+  FREESTANDING_FLAGS="$freestanding_flags"
+
 
 
 # Enable descriptive messages to standard output on termination.
@@ -15960,7 +15969,7 @@ $as_echo "$glibcxx_cv_atomic_long_long" >&6; }
   # Fake what AC_TRY_COMPILE does.
 
     cat > conftest.$ac_ext << EOF
-#line 15963 "configure"
+#line 15972 "configure"
 int main()
 {
   typedef bool atomic_type;
@@ -15995,7 +16004,7 @@ $as_echo "$glibcxx_cv_atomic_bool" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15998 "configure"
+#line 16007 "configure"
 int main()
 {
   typedef short atomic_type;
@@ -16030,7 +16039,7 @@ $as_echo "$glibcxx_cv_atomic_short" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 16033 "configure"
+#line 16042 "configure"
 int main()
 {
   // NB: _Atomic_word not necessarily int.
@@ -16066,7 +16075,7 @@ $as_echo "$glibcxx_cv_atomic_int" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 16069 "configure"
+#line 16078 "configure"
 int main()
 {
   typedef long long atomic_type;
@@ -16219,7 +16228,7 @@ $as_echo "mutex" >&6; }
   # unnecessary for this test.
 
     cat > conftest.$ac_ext << EOF
-#line 16222 "configure"
+#line 16231 "configure"
 int main()
 {
   _Decimal32 d1;
@@ -16261,7 +16270,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
   # unnecessary for this test.
 
   cat > conftest.$ac_ext << EOF
-#line 16264 "configure"
+#line 16273 "configure"
 template<typename T1, typename T2>
   struct same
   { typedef T2 type; };
@@ -20183,6 +20192,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 # For the EOF, SEEK_CUR, and SEEK_END integer constants.
 
 
+if test "$is_hosted" = yes; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for the value of EOF" >&5
 $as_echo_n "checking for the value of EOF... " >&6; }
 if ${glibcxx_cv_stdio_eof+:} false; then :
@@ -20248,6 +20258,7 @@ cat >>confdefs.h <<_ACEOF
 #define _GLIBCXX_STDIO_SEEK_END $glibcxx_cv_stdio_seek_end
 _ACEOF
 
+fi
 
 
 # For gettimeofday support.
@@ -29129,7 +29140,7 @@ else
 
     $as_echo "#define HAVE_MEMALIGN 1" >>confdefs.h
 
-  else
+  elif test "x$with_headers" != "xno"; then
 
 # Base decisions on target environment.
 case "${host}" in
@@ -74203,6 +74214,9 @@ $as_echo "#define HAVE_LINUX_FUTEX 1" >>confdefs.h
 fi
 
 
+if test "$is_hosted" = yes; then
+# TODO: remove this and change src/c++11/compatibility-atomic-c++0x.cc to
+# use <stdint.h> instead of <gstdint.h>.
 
 
 inttype_headers=`echo inttypes.h sys/inttypes.h  | sed -e 's/,/ /g'`
@@ -74604,6 +74618,7 @@ ac_config_commands="$ac_config_commands include/gstdint.h"
 
 
 
+fi
 
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GNU c++filt" >&5
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index 5b3c92f..827d770 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -90,7 +90,9 @@ AC_SYS_LARGEFILE
 GLIBCXX_CONFIGURE
 
 # Libtool setup.
-if test "x${with_newlib}" != "xyes" && test "x${with_avrlibc}" != "xyes"; then
+if test "x${with_newlib}" != "xyes" &&
+    test "x${with_avrlibc}" != "xyes" &&
+    test "x$with_headers" != "xno"; then
   AC_LIBTOOL_DLOPEN
 fi
 AM_PROG_LIBTOOL
@@ -351,7 +353,7 @@ else
 
     AC_DEFINE(HAVE_ICONV)
     AC_DEFINE(HAVE_MEMALIGN)
-  else
+  elif test "x$with_headers" != "xno"; then
     GLIBCXX_CROSSCONFIG
   fi
 
@@ -390,7 +392,11 @@ GCC_CHECK_UNWIND_GETIPINFO
 
 GCC_LINUX_FUTEX([AC_DEFINE(HAVE_LINUX_FUTEX, 1, [Define if futex syscall is available.])])
 
+if test "$is_hosted" = yes; then
+# TODO: remove this and change src/c++11/compatibility-atomic-c++0x.cc to
+# use <stdint.h> instead of <gstdint.h>.
 GCC_HEADER_STDINT(include/gstdint.h)
+fi
 
 GLIBCXX_ENABLE_SYMVERS([yes])
 AC_SUBST(libtool_VERSION)
diff --git a/libstdc++-v3/doc/Makefile.in b/libstdc++-v3/doc/Makefile.in
index bfb3ce7..443d291 100644
--- a/libstdc++-v3/doc/Makefile.in
+++ b/libstdc++-v3/doc/Makefile.in
@@ -199,6 +199,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
index 4e4a240..0031f54 100644
--- a/libstdc++-v3/include/Makefile.in
+++ b/libstdc++-v3/include/Makefile.in
@@ -199,6 +199,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/libsupc++/Makefile.am b/libstdc++-v3/libsupc++/Makefile.am
index 2a69a1c..65b5c1a 100644
--- a/libstdc++-v3/libsupc++/Makefile.am
+++ b/libstdc++-v3/libsupc++/Makefile.am
@@ -139,7 +139,7 @@ atomicity.cc: ${atomicity_file}
 # as the occasion call for it.
 AM_CXXFLAGS = \
 	$(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
-	$(XTEMPLATE_FLAGS) \
+	$(XTEMPLATE_FLAGS) $(FREESTANDING_FLAGS) \
 	$(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS)  $(CONFIG_CXXFLAGS)
 
 AM_MAKEFLAGS = \
diff --git a/libstdc++-v3/libsupc++/Makefile.in b/libstdc++-v3/libsupc++/Makefile.in
index 5776a56..5cbbf99 100644
--- a/libstdc++-v3/libsupc++/Makefile.in
+++ b/libstdc++-v3/libsupc++/Makefile.in
@@ -308,6 +308,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
@@ -579,7 +580,7 @@ atomicity_file = ${glibcxx_srcdir}/$(ATOMICITY_SRCDIR)/atomicity.h
 # as the occasion call for it.
 AM_CXXFLAGS = \
 	$(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
-	$(XTEMPLATE_FLAGS) \
+	$(XTEMPLATE_FLAGS) $(FREESTANDING_FLAGS) \
 	$(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS)  $(CONFIG_CXXFLAGS)
 
 AM_MAKEFLAGS = \
diff --git a/libstdc++-v3/po/Makefile.in b/libstdc++-v3/po/Makefile.in
index 8edd2e05..0d29364 100644
--- a/libstdc++-v3/po/Makefile.in
+++ b/libstdc++-v3/po/Makefile.in
@@ -199,6 +199,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/python/Makefile.in b/libstdc++-v3/python/Makefile.in
index b3b56c4..07b5807 100644
--- a/libstdc++-v3/python/Makefile.in
+++ b/libstdc++-v3/python/Makefile.in
@@ -229,6 +229,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/src/Makefile.in b/libstdc++-v3/src/Makefile.in
index 05b25ed..fa4b243 100644
--- a/libstdc++-v3/src/Makefile.in
+++ b/libstdc++-v3/src/Makefile.in
@@ -298,6 +298,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/src/c++11/Makefile.in b/libstdc++-v3/src/c++11/Makefile.in
index 8654050..d20d1ed 100644
--- a/libstdc++-v3/src/c++11/Makefile.in
+++ b/libstdc++-v3/src/c++11/Makefile.in
@@ -265,6 +265,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/src/c++17/Makefile.in b/libstdc++-v3/src/c++17/Makefile.in
index 8c02be6..83d8490 100644
--- a/libstdc++-v3/src/c++17/Makefile.in
+++ b/libstdc++-v3/src/c++17/Makefile.in
@@ -245,6 +245,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/src/c++20/Makefile.in b/libstdc++-v3/src/c++20/Makefile.in
index e6892d3..5f0acb4 100644
--- a/libstdc++-v3/src/c++20/Makefile.in
+++ b/libstdc++-v3/src/c++20/Makefile.in
@@ -240,6 +240,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/src/c++98/Makefile.in b/libstdc++-v3/src/c++98/Makefile.in
index f9ebb0f..12c6f2d 100644
--- a/libstdc++-v3/src/c++98/Makefile.in
+++ b/libstdc++-v3/src/c++98/Makefile.in
@@ -261,6 +261,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/src/filesystem/Makefile.in b/libstdc++-v3/src/filesystem/Makefile.in
index 74a6d27..e0693b1 100644
--- a/libstdc++-v3/src/filesystem/Makefile.in
+++ b/libstdc++-v3/src/filesystem/Makefile.in
@@ -269,6 +269,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@
diff --git a/libstdc++-v3/testsuite/Makefile.in b/libstdc++-v3/testsuite/Makefile.in
index c65cdaf..b442dfe 100644
--- a/libstdc++-v3/testsuite/Makefile.in
+++ b/libstdc++-v3/testsuite/Makefile.in
@@ -199,6 +199,7 @@ EXEEXT = @EXEEXT@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@
 EXTRA_CXX_FLAGS = @EXTRA_CXX_FLAGS@
 FGREP = @FGREP@
+FREESTANDING_FLAGS = @FREESTANDING_FLAGS@
 GLIBCXX_INCLUDES = @GLIBCXX_INCLUDES@
 GLIBCXX_LIBS = @GLIBCXX_LIBS@
 GREP = @GREP@