Properly test for madvise on Solaris 10 (PR bootstrap/50777)

	PR bootstrap/50777
	* configure.ac: Save and restore CXXFLAGS around
	gcc_AC_CHECK_DECLS uses.
	Check for madvise() declaration with g++ if --enable-build-with-cxx.
	* configure: Regenerate.
	* config.in: Regenerate.
	* ggc-page.c (USING_MADVISE): Also check HAVE_DECL_MADVISE.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@180195 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 127 insertions, 3 deletions

diff --git a/gcc/configure b/gcc/configure
index 32542dd455d..0540430dc20 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -10415,6 +10415,8 @@ $as_echo "#define HAVE_LANGINFO_CODESET 1" >>confdefs.h
 # We will need to find libiberty.h and ansidecl.h
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -I${srcdir} -I${srcdir}/../include"
+saved_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="$CXXFLAGS -I${srcdir} -I${srcdir}/../include"
 for ac_func in getenv atol asprintf sbrk abort atof getcwd getwd \
 	strsignal strstr strverscmp \
 	errno snprintf vsnprintf vasprintf malloc realloc calloc \
@@ -10719,6 +10721,127 @@ fi
 done
 
 
+# g++ on Solaris 10+ defines _XOPEN_SOURCE=600, which hides the madvise()
+# prototype.
+if test "$ENABLE_BUILD_WITH_CXX" = "yes"; then :
+  ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+   for ac_func in madvise
+do
+  ac_tr_decl=`$as_echo "HAVE_DECL_$ac_func" | $as_tr_cpp`
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $ac_func is declared" >&5
+$as_echo_n "checking whether $ac_func is declared... " >&6; }
+if { as_var=gcc_cv_have_decl_$ac_func; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#undef $ac_tr_decl
+#define $ac_tr_decl 1
+
+     #include "ansidecl.h"
+     #include "system.h"
+
+
+int
+main ()
+{
+#ifndef $ac_func
+char *(*pfn) = (char *(*)) $ac_func ;
+#endif
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  eval "gcc_cv_have_decl_$ac_func=yes"
+else
+  eval "gcc_cv_have_decl_$ac_func=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+
+if eval "test \"`echo '$gcc_cv_have_decl_'$ac_func`\" = yes"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; } ; cat >>confdefs.h <<_ACEOF
+#define $ac_tr_decl 1
+_ACEOF
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; } ; cat >>confdefs.h <<_ACEOF
+#define $ac_tr_decl 0
+_ACEOF
+
+fi
+
+done
+
+   ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+else
+  for ac_func in madvise
+do
+  ac_tr_decl=`$as_echo "HAVE_DECL_$ac_func" | $as_tr_cpp`
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $ac_func is declared" >&5
+$as_echo_n "checking whether $ac_func is declared... " >&6; }
+if { as_var=gcc_cv_have_decl_$ac_func; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#undef $ac_tr_decl
+#define $ac_tr_decl 1
+
+     #include "ansidecl.h"
+     #include "system.h"
+
+
+int
+main ()
+{
+#ifndef $ac_func
+char *(*pfn) = (char *(*)) $ac_func ;
+#endif
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "gcc_cv_have_decl_$ac_func=yes"
+else
+  eval "gcc_cv_have_decl_$ac_func=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+
+if eval "test \"`echo '$gcc_cv_have_decl_'$ac_func`\" = yes"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; } ; cat >>confdefs.h <<_ACEOF
+#define $ac_tr_decl 1
+_ACEOF
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; } ; cat >>confdefs.h <<_ACEOF
+#define $ac_tr_decl 0
+_ACEOF
+
+fi
+
+done
+
+
+fi
+
 # More time-related stuff.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for struct tms" >&5
 $as_echo_n "checking for struct tms... " >&6; }
@@ -10795,8 +10918,9 @@ $as_echo "#define HAVE_CLOCK_T 1" >>confdefs.h
 
 fi
 
-# Restore CFLAGS from before the gcc_AC_NEED_DECLARATIONS tests.
+# Restore CFLAGS, CXXFLAGS from before the gcc_AC_NEED_DECLARATIONS tests.
 CFLAGS="$saved_CFLAGS"
+CXXFLAGS="$saved_CXXFLAGS"
 
 # Check whether --enable-initfini-array was given.
 if test "${enable_initfini_array+set}" = set; then :
@@ -17948,7 +18072,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 17951 "configure"
+#line 18075 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -18054,7 +18178,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 18057 "configure"
+#line 18181 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H