config: Add tests for modules-desired features

this adds configure tests for features that modules can take advantage
of -- and if they are not present has reduced or fallback functionality.

	gcc/
	* configure.ac: Add tests for fstatat, sighandler_t, O_CLOEXEC,
	unix-domain and ipv6 sockets.
	* config.in: Rebuilt.
	* configure: Rebuilt.

3 files changed, 268 insertions, 18 deletions

diff --git a/gcc/config.in b/gcc/config.in
index 6fae7b7..3221dae 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -302,6 +302,18 @@
 #endif
 
 
+/* Define if AF_INET6 supported. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AF_INET6
+#endif
+
+
+/* Define if AF_UNIX supported. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AF_UNIX
+#endif
+
+
 /* Define if your assembler supports architecture modifiers. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_ARCHITECTURE_MODIFIERS
@@ -564,12 +576,24 @@
 #endif
 
 
+/* Define if the assembler understands -march=rv*_zifencei. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_MARCH_ZIFENCEI
+#endif
+
+
 /* Define if your assembler supports mfcr field. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_MFCRF
 #endif
 
 
+/* Define if the assembler understands -misa-spec=. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_MISA_SPEC
+#endif
+
+
 /* Define if your Mac OS X assembler supports the -mmacos-version-min option.
    */
 #ifndef USED_FOR_TARGET
@@ -643,18 +667,6 @@
 #endif
 
 
-/* Define if your assembler supports -misa-spec=. */
-#ifndef USED_FOR_TARGET
-#undef HAVE_AS_MISA_SPEC
-#endif
-
-
-/* Define if your assembler supports -march=rv*_zifencei. */
-#ifndef USED_FOR_TARGET
-#undef HAVE_AS_MARCH_ZIFENCEI
-#endif
-
-
 /* Define if your assembler supports relocs needed by -fpic. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_SMALL_PIC_RELOCS
@@ -1265,6 +1277,12 @@
 #endif
 
 
+/* Define to 1 if you have the `fstatat' function. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_FSTATAT
+#endif
+
+
 /* Define to 1 if you have the <ftw.h> header file. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_FTW_H
@@ -1770,6 +1788,12 @@
 #endif
 
 
+/* Define to 1 if you have the `posix_fallocate' function. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_POSIX_FALLOCATE
+#endif
+
+
 /* Define to 1 if you have the `putchar_unlocked' function. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_PUTCHAR_UNLOCKED
@@ -1794,6 +1818,12 @@
 #endif
 
 
+/* Define if <sys/signal.h> defines sighandler_t */
+#ifndef USED_FOR_TARGET
+#undef HAVE_SIGHANDLER_T
+#endif
+
+
 /* Define if the system-provided CRTs are present on Solaris. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_SOLARIS_CRTS
@@ -2033,6 +2063,12 @@
 #endif
 
 
+/* Define if O_CLOEXEC supported by fcntl. */
+#ifndef USED_FOR_TARGET
+#undef HOST_HAS_O_CLOEXEC
+#endif
+
+
 /* Define as const if the declaration of iconv() needs const. */
 #ifndef USED_FOR_TARGET
 #undef ICONV_CONST
diff --git a/gcc/configure b/gcc/configure
index f61b815..9c70db2 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -10142,8 +10142,8 @@ fi
 
 for ac_func in times clock kill getrlimit setrlimit atoq \
 	popen sysconf strsignal getrusage nl_langinfo \
-	gettimeofday mbstowcs wcswidth mmap setlocale \
-	clearerr_unlocked feof_unlocked   ferror_unlocked fflush_unlocked fgetc_unlocked fgets_unlocked   fileno_unlocked fprintf_unlocked fputc_unlocked fputs_unlocked   fread_unlocked fwrite_unlocked getchar_unlocked getc_unlocked   putchar_unlocked putc_unlocked madvise mallinfo mallinfo2
+	gettimeofday mbstowcs wcswidth mmap posix_fallocate setlocale \
+	clearerr_unlocked feof_unlocked   ferror_unlocked fflush_unlocked fgetc_unlocked fgets_unlocked   fileno_unlocked fprintf_unlocked fputc_unlocked fputs_unlocked   fread_unlocked fwrite_unlocked getchar_unlocked getc_unlocked   putchar_unlocked putc_unlocked madvise mallinfo mallinfo2 fstatat
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_cxx_check_func "$LINENO" "$ac_func" "$as_ac_var"
@@ -10215,6 +10215,14 @@ _ACEOF
 
 fi
 
+ac_fn_cxx_check_type "$LINENO" "sighander_t" "ac_cv_type_sighander_t" "signal.h
+"
+if test "x$ac_cv_type_sighander_t" = xyes; then :
+
+$as_echo "#define HAVE_SIGHANDLER_T 1" >>confdefs.h
+
+fi
+
 
 
 ac_fn_cxx_check_header_preproc "$LINENO" "sys/mman.h" "ac_cv_header_sys_mman_h"
@@ -11938,6 +11946,142 @@ $as_echo "#define HOST_HAS_F_SETLKW 1" >>confdefs.h
 
 fi
 
+# Check if O_CLOEXEC is defined by fcntl
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for O_CLOEXEC" >&5
+$as_echo_n "checking for O_CLOEXEC... " >&6; }
+if ${ac_cv_o_cloexec+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <fcntl.h>
+int
+main ()
+{
+
+return open ("/dev/null", O_RDONLY | O_CLOEXEC);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  ac_cv_o_cloexec=yes
+else
+  ac_cv_o_cloexec=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_o_cloexec" >&5
+$as_echo "$ac_cv_o_cloexec" >&6; }
+if test $ac_cv_o_cloexec = yes; then
+
+$as_echo "#define HOST_HAS_O_CLOEXEC 1" >>confdefs.h
+
+fi
+
+# C++ Modules would like some networking features to provide the mapping
+# server.  You can still use modules without them though.
+# The following network-related checks could probably do with some
+# Windows and other non-linux defenses and checking.
+
+# Local socket connectivity wants AF_UNIX networking
+# Check for AF_UNIX networking
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for AF_UNIX" >&5
+$as_echo_n "checking for AF_UNIX... " >&6; }
+if ${ac_cv_af_unix+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+int
+main ()
+{
+
+sockaddr_un un;
+un.sun_family = AF_UNSPEC;
+int fd = socket (AF_UNIX, SOCK_STREAM, 0);
+connect (fd, (sockaddr *)&un, sizeof (un));
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  ac_cv_af_unix=yes
+else
+  ac_cv_af_unix=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_af_unix" >&5
+$as_echo "$ac_cv_af_unix" >&6; }
+if test $ac_cv_af_unix = yes; then
+
+$as_echo "#define HAVE_AF_UNIX 1" >>confdefs.h
+
+fi
+
+# Remote socket connectivity wants AF_INET6 networking
+# Check for AF_INET6 networking
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for AF_INET6" >&5
+$as_echo_n "checking for AF_INET6... " >&6; }
+if ${ac_cv_af_inet6+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+int
+main ()
+{
+
+sockaddr_in6 in6;
+in6.sin6_family = AF_UNSPEC;
+struct addrinfo *addrs = 0;
+struct addrinfo hints;
+hints.ai_flags = 0;
+hints.ai_family = AF_INET6;
+hints.ai_socktype = SOCK_STREAM;
+hints.ai_protocol = 0;
+hints.ai_canonname = 0;
+hints.ai_addr = 0;
+hints.ai_next = 0;
+int e = getaddrinfo ("localhost", 0, &hints, &addrs);
+const char *str = gai_strerror (e);
+freeaddrinfo (addrs);
+int fd = socket (AF_INET6, SOCK_STREAM, 0);
+connect (fd, (sockaddr *)&in6, sizeof (in6));
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  ac_cv_af_inet6=yes
+else
+  ac_cv_af_inet6=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_af_inet6" >&5
+$as_echo "$ac_cv_af_inet6" >&6; }
+if test $ac_cv_af_inet6 = yes; then
+
+$as_echo "#define HAVE_AF_INET6 1" >>confdefs.h
+
+fi
+
 # Restore CFLAGS, CXXFLAGS from before the gcc_AC_NEED_DECLARATIONS tests.
 CFLAGS="$saved_CFLAGS"
 CXXFLAGS="$saved_CXXFLAGS"
@@ -19036,7 +19180,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19039 "configure"
+#line 19183 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -19142,7 +19286,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19145 "configure"
+#line 19289 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/gcc/configure.ac b/gcc/configure.ac
index b2732d1..1cce371 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1417,8 +1417,8 @@ define(gcc_UNLOCKED_FUNCS, clearerr_unlocked feof_unlocked dnl
   putchar_unlocked putc_unlocked)
 AC_CHECK_FUNCS(times clock kill getrlimit setrlimit atoq \
 	popen sysconf strsignal getrusage nl_langinfo \
-	gettimeofday mbstowcs wcswidth mmap setlocale \
-	gcc_UNLOCKED_FUNCS madvise mallinfo mallinfo2)
+	gettimeofday mbstowcs wcswidth mmap posix_fallocate setlocale \
+	gcc_UNLOCKED_FUNCS madvise mallinfo mallinfo2 fstatat)
 
 if test x$ac_cv_func_mbstowcs = xyes; then
   AC_CACHE_CHECK(whether mbstowcs works, gcc_cv_func_mbstowcs_works,
@@ -1440,6 +1440,10 @@ fi
 
 AC_CHECK_TYPE(ssize_t, int)
 AC_CHECK_TYPE(caddr_t, char *)
+AC_CHECK_TYPE(sighander_t,
+  AC_DEFINE(HAVE_SIGHANDLER_T, 1,
+    [Define if <sys/signal.h> defines sighandler_t]),
+    ,signal.h)
 
 GCC_AC_FUNC_MMAP_BLACKLIST
 
@@ -1585,6 +1589,72 @@ if test $ac_cv_f_setlkw = yes; then
   [Define if F_SETLKW supported by fcntl.])
 fi
 
+# Check if O_CLOEXEC is defined by fcntl
+AC_CACHE_CHECK(for O_CLOEXEC, ac_cv_o_cloexec, [
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <fcntl.h>]], [[
+return open ("/dev/null", O_RDONLY | O_CLOEXEC);]])],
+[ac_cv_o_cloexec=yes],[ac_cv_o_cloexec=no])])
+if test $ac_cv_o_cloexec = yes; then
+  AC_DEFINE(HOST_HAS_O_CLOEXEC, 1,
+  [Define if O_CLOEXEC supported by fcntl.])
+fi
+
+# C++ Modules would like some networking features to provide the mapping
+# server.  You can still use modules without them though.
+# The following network-related checks could probably do with some
+# Windows and other non-linux defenses and checking.
+
+# Local socket connectivity wants AF_UNIX networking
+# Check for AF_UNIX networking
+AC_CACHE_CHECK(for AF_UNIX, ac_cv_af_unix, [
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>]],[[
+sockaddr_un un;
+un.sun_family = AF_UNSPEC;
+int fd = socket (AF_UNIX, SOCK_STREAM, 0);
+connect (fd, (sockaddr *)&un, sizeof (un));]])],
+[ac_cv_af_unix=yes],
+[ac_cv_af_unix=no])])
+if test $ac_cv_af_unix = yes; then
+  AC_DEFINE(HAVE_AF_UNIX, 1,
+  [Define if AF_UNIX supported.])
+fi
+
+# Remote socket connectivity wants AF_INET6 networking
+# Check for AF_INET6 networking
+AC_CACHE_CHECK(for AF_INET6, ac_cv_af_inet6, [
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>]],[[
+sockaddr_in6 in6;
+in6.sin6_family = AF_UNSPEC;
+struct addrinfo *addrs = 0;
+struct addrinfo hints;
+hints.ai_flags = 0;
+hints.ai_family = AF_INET6;
+hints.ai_socktype = SOCK_STREAM;
+hints.ai_protocol = 0;
+hints.ai_canonname = 0;
+hints.ai_addr = 0;
+hints.ai_next = 0;
+int e = getaddrinfo ("localhost", 0, &hints, &addrs);
+const char *str = gai_strerror (e);
+freeaddrinfo (addrs);
+int fd = socket (AF_INET6, SOCK_STREAM, 0);
+connect (fd, (sockaddr *)&in6, sizeof (in6));]])],
+[ac_cv_af_inet6=yes],
+[ac_cv_af_inet6=no])])
+if test $ac_cv_af_inet6 = yes; then
+  AC_DEFINE(HAVE_AF_INET6, 1,
+  [Define if AF_INET6 supported.])
+fi
+
 # Restore CFLAGS, CXXFLAGS from before the gcc_AC_NEED_DECLARATIONS tests.
 CFLAGS="$saved_CFLAGS"
 CXXFLAGS="$saved_CXXFLAGS"