Use a non-empty test program to test ability to link.

On bare-metal targets, I/O support is typically provided by a BSP and
requires a linker script and/or hosting library to be specified on the
linker command line.  Linking an empty program with the default linker
script may succeed, however, which confuses libstdc++ configuration
when programs that probe for the presence of various I/O features fail
with link errors.

2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>

	PR libstdc++/79193
	PR libstdc++/88999

	config/
	* no-executables.m4: Use a non-empty program to test for linker
	support.

	libgcc/
	* configure: Regenerated.

	libgfortran/
	* configure: Regenerated.

	libiberty/
	* configure: Regenerated.

	libitm/
	* configure: Regenerated.

	libobjc/
	* configure: Regenerated.

	libquadmath/
	* configure: Regenerated.

	libssp/
	* configure: Regenerated.

	libstdc++v-3/
	* configure: Regenerated.

diff --git a/config/ChangeLog b/config/ChangeLog
index f1fec81..01428dd 100644 (file)
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,3 +1,11 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * no-executables.m4: Use a non-empty program to test for linker
+       support.
+
 2020-02-01  Andrew Burgess  <andrew.burgess@embecosm.com>
 
        * lib-link.m4 (AC_LIB_LINKFLAGS_BODY): Update shell syntax.

diff --git a/config/no-executables.m4 b/config/no-executables.m4
index 9061624..6842f84 100644 (file)
--- a/config/no-executables.m4
+++ b/config/no-executables.m4
@@ -25,7 +25,9 @@ AC_BEFORE([$0], [_AC_COMPILER_EXEEXT])
 AC_BEFORE([$0], [AC_LINK_IFELSE])
 
 m4_define([_AC_COMPILER_EXEEXT],
-[AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
+[AC_LANG_CONFTEST([AC_LANG_PROGRAM(
+                    [#include <stdio.h>],
+                    [printf ("hello world\n");])])
 # FIXME: Cleanup?
 AS_IF([AC_TRY_EVAL(ac_link)], [gcc_no_link=no], [gcc_no_link=yes])
 if test x$gcc_no_link = xyes; then

diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index 917d0e7..7b46ccb 100644 (file)
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * configure: Regenerated.
+
 2020-02-10  Jeff Law  <law@redhat.com>
 
        * config/frv/frvbegin.c: Use right flags for .ctors and .dtors

diff --git a/libgcc/configure b/libgcc/configure
index ab8d471..093036a 100755 (executable)
--- a/libgcc/configure
+++ b/libgcc/configure
@@ -3553,11 +3553,11 @@ done
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdio.h>
 int
 main ()
 {
-
+printf ("hello world\n");
   ;
   return 0;
 }

diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog
index fe7e480..5632fbc 100644 (file)
--- a/libgfortran/ChangeLog
+++ b/libgfortran/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * configure: Regenerated.
+
 2020-01-24  Maciej W. Rozycki  <macro@wdc.com>
 
        * configure.ac: Handle `--with-toolexeclibdir='.

diff --git a/libgfortran/configure b/libgfortran/configure
index 8ba6831..d01654e 100755 (executable)
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -4042,11 +4042,11 @@ done
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdio.h>
 int
 main ()
 {
-
+printf ("hello world\n");
   ;
   return 0;
 }

diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index b3ec231..84225ad 100644 (file)
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * configure: Regenerated.
+
 2020-02-05  Andrew Burgess  <andrew.burgess@embecosm.com>
 
        * hashtab.c (htab_remove_elt): Make a parameter const.

diff --git a/libiberty/configure b/libiberty/configure
index 7a34dab..d2413f1 100755 (executable)
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -3310,11 +3310,11 @@ done
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdio.h>
 int
 main ()
 {
-
+printf ("hello world\n");
   ;
   return 0;
 }

diff --git a/libitm/ChangeLog b/libitm/ChangeLog
index feccd16..9c70974 100644 (file)
--- a/libitm/ChangeLog
+++ b/libitm/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * configure: Regenerated.
+
 2020-01-24  Maciej W. Rozycki  <macro@wdc.com>
 
        * configure.ac: Handle `--with-toolexeclibdir='.

diff --git a/libitm/configure b/libitm/configure
old mode 100644 (file)
new mode 100755 (executable)

diff --git a/libobjc/ChangeLog b/libobjc/ChangeLog
index db7fce7..b5bba60 100644 (file)
--- a/libobjc/ChangeLog
+++ b/libobjc/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * configure: Regenerated.
+
 2020-01-24  Maciej W. Rozycki  <macro@wdc.com>
 
        * Makefile.in (aclocal_deps): Add `toolexeclibdir.m4'.

diff --git a/libobjc/configure b/libobjc/configure
index 46124b2..2f8924e 100755 (executable)
--- a/libobjc/configure
+++ b/libobjc/configure
@@ -2917,11 +2917,11 @@ done
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdio.h>
 int
 main ()
 {
-
+printf ("hello world\n");
   ;
   return 0;
 }

diff --git a/libquadmath/ChangeLog b/libquadmath/ChangeLog
index 0b1db14..2df546a 100644 (file)
--- a/libquadmath/ChangeLog
+++ b/libquadmath/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * configure: Regenerated.
+
 2020-01-24  Maciej W. Rozycki  <macro@wdc.com>
 
        * configure.ac: Handle `--with-toolexeclibdir='.

diff --git a/libquadmath/configure b/libquadmath/configure
index 339e809..7b45eb7 100755 (executable)
--- a/libquadmath/configure
+++ b/libquadmath/configure
@@ -3461,11 +3461,11 @@ done
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdio.h>
 int
 main ()
 {
-
+printf ("hello world\n");
   ;
   return 0;
 }

diff --git a/libssp/ChangeLog b/libssp/ChangeLog
index f1ccde4..9e3e6a6 100644 (file)
--- a/libssp/ChangeLog
+++ b/libssp/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * configure: Regenerated.
+
 2020-01-24  Maciej W. Rozycki  <macro@wdc.com>
 
        * configure.ac: Handle `--with-toolexeclibdir='.

diff --git a/libssp/configure b/libssp/configure
index 5541cf9..dd3b41d 100755 (executable)
--- a/libssp/configure
+++ b/libssp/configure
@@ -3402,11 +3402,11 @@ done
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdio.h>
 int
 main ()
 {
-
+printf ("hello world\n");
   ;
   return 0;
 }

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index b2f66e0..922c715 100644 (file)
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>
+
+       PR libstdc++/79193
+       PR libstdc++/88999
+
+       * configure: Regenerated.
+
 2020-02-12  François Dumont  <fdumont@gcc.gnu.org>
 
        * include/bits/hashtable.h

diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index a39c33b..9f9c5a2 100755 (executable)
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -4130,11 +4130,11 @@ done
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdio.h>
 int
 main ()
 {
-
+printf ("hello world\n");
   ;
   return 0;
 }