RFA: Add test for linker support of -shared

[Nick Clifton]

Hi Janis,

  I would like to add another new proc to target-supports.exp.  This
  time it is a check for linker support of the -shared command line
  switch.  Not all linkers support this switch, since not all
  toolchains support shared libraries.  (Toolchains for embedded
  processors in particular, such as the RX).

  The intention is to use this proc as a requirement in tests that
  want to use the -shared option, notably the new LTO tests.

  Tested with an rx-elf toolchain (fewer gcc testsuite failures) and
  an i686-pc-linux-gnu toolchain (no regressions).

  OK to apply ?

Cheers
  Nick

gcc/testsuite/ChangeLog
2009-11-03  Nick Clifton  <nickc@redhat.com>

	* lib/target-supports.exp
	(check_effective_target_linker_supports_shared): New proc.
        * g++.dg/lto/20081120-1_0.C: Require linker support of
	-shared.
        * g++.dg/lto/20091002-1_0.C: Likewise.
        * g++.dg/lto/20081120-2_0.C: Likewise.
        * g++.dg/lto/20091002-2_0.C: Likewise.
        * g++.dg/lto/20091002-3_0.C: Likewise.
        * g++.dg/lto/20081123_0.C: Likewise.
        * g++.dg/lto/20090313_0.C: Likewise.
        * g++.dg/lto/20081109-1_0.C: Likewise.
        * g++.dg/lto/20081219_0.C: Likewise.
        * g++.dg/lto/20081204-1_0.C: Likewise.
        * g++.dg/lto/20090302_0.C: Likewise.
        * g++.dg/lto/20081119-1_0.C: Likewise.
        * g++.dg/lto/20081118_0.C: Likewise.

Index: testsuite/lib/target-supports.exp
===================================================================
--- testsuite/lib/target-supports.exp	(revision 153851)
+++ testsuite/lib/target-supports.exp	(working copy)
@@ -669,6 +679,14 @@
     return 0
 }
 
+# Returns true if the linker accepts the -shared option.
+proc check_effective_target_linker_supports_shared { } {
+    return [check_no_compiler_messages linker_supports_shared executable {
+	    int foo (void) { return 0; }
+	} "-shared" ]
+}
+
+
 # Return true if the target supports -mpaired-single (as used on MIPS).
 
 proc check_effective_target_mpaired_single { } {

Index: testsuite/g++.dg/lto/20081120-1_0.C
===================================================================
--- testsuite/g++.dg/lto/20081120-1_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20081120-1_0.C	(working copy)
@@ -1,5 +1,6 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-flto -shared}} }
 extern "C"
 {
  extern __inline __attribute__((__gnu_inline__)) int pthread_equal(int, int)
Index: testsuite/g++.dg/lto/20091002-1_0.C
===================================================================
--- testsuite/g++.dg/lto/20091002-1_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20091002-1_0.C	(working copy)
@@ -1,4 +1,5 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-fPIC -flto}} }
 // { dg-extra-ld-options "-fPIC -shared" }
 
Index: testsuite/g++.dg/lto/20081120-2_0.C
===================================================================
--- testsuite/g++.dg/lto/20081120-2_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20081120-2_0.C	(working copy)
@@ -1,4 +1,5 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-flto -shared}} }
 template < typename > struct Foo
 {
Index: testsuite/g++.dg/lto/20091002-2_0.C
===================================================================
--- testsuite/g++.dg/lto/20091002-2_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20091002-2_0.C	(working copy)
@@ -1,4 +1,5 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-fPIC}} }
 // { dg-extra-ld-options "-fPIC -shared" }
 
Index: testsuite/g++.dg/lto/20091002-3_0.C
===================================================================
--- testsuite/g++.dg/lto/20091002-3_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20091002-3_0.C	(working copy)
@@ -1,4 +1,5 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-fPIC}} }
 // { dg-extra-ld-options "-fPIC -shared" }
 
Index: testsuite/g++.dg/lto/20081123_0.C
===================================================================
--- testsuite/g++.dg/lto/20081123_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20081123_0.C	(working copy)
@@ -1,4 +1,5 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-fwhopr -shared -fPIC}} }
 
 int
Index: testsuite/g++.dg/lto/20090313_0.C
===================================================================
--- testsuite/g++.dg/lto/20090313_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20090313_0.C	(working copy)
@@ -1,4 +1,5 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-fwhopr -fPIC}} }
 // { dg-extra-ld-options "-fwhopr -shared" }
 
Index: testsuite/g++.dg/lto/20081109-1_0.C
===================================================================
--- testsuite/g++.dg/lto/20081109-1_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20081109-1_0.C	(working copy)
@@ -1,5 +1,6 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-fPIC -fwhopr}} }
-// { dg-extra-ld-options "-fPIC -fwhopr -shared -fno-exceptions" }
+// { dg-extra-ld-options "-fPIC -fwhopr shared -fno-exceptions" }
 void func(); class Foo { };
 void bar() { try { func(); } catch (Foo) { } };
Index: testsuite/g++.dg/lto/20081219_0.C
===================================================================
--- testsuite/g++.dg/lto/20081219_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20081219_0.C	(working copy)
@@ -1,4 +1,5 @@
 // { dg-lto-do link }
+// { dg-require-effective-target linker_supports_shared }
 // { dg-lto-options {{-fPIC -fwhopr -O2}} }
 // { dg-extra-ld-options "-O2 -fPIC -fwhopr -shared" }
 
Index: testsuite/g++.dg/lto/20081204-1_0.C
===================================================================
--- testsuite/g++.dg/lto/20081204-1_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20081204-1_0.C	(working copy)
@@ -1,4 +1,5 @@
 /* { dg-lto-do link } */
+/* { dg-require-effective-target linker_supports_shared } */
 /* { dg-lto-options {{-fwhopr -fPIC -shared}} } */
 
 /* Tests for the absence during linking of:
Index: testsuite/g++.dg/lto/20090302_0.C
===================================================================
--- testsuite/g++.dg/lto/20090302_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20090302_0.C	(working copy)
@@ -1,4 +1,5 @@
 /* { dg-lto-do link } */
+/* { dg-require-effective-target linker_supports_shared } */
 /* { dg-lto-options {{-fPIC -fwhopr -shared}} } */
 struct Foo {
   bool Mumble();
Index: testsuite/g++.dg/lto/20081119-1_0.C
===================================================================
--- testsuite/g++.dg/lto/20081119-1_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20081119-1_0.C	(working copy)
@@ -1,4 +1,5 @@
 /* { dg-lto-do link } */
+/* { dg-require-effective-target linker_supports_shared } */
 /* { dg-lto-options {{-fPIC -fwhopr -shared}} } */
 
 #include "20081119-1.h"
Index: testsuite/g++.dg/lto/20081118_0.C
===================================================================
--- testsuite/g++.dg/lto/20081118_0.C	(revision 153851)
+++ testsuite/g++.dg/lto/20081118_0.C	(working copy)
@@ -1,4 +1,5 @@
 /* { dg-lto-do link } */
+/* { dg-require-effective-target linker_supports_shared } */
 /* { dg-lto-options {{-fPIC -fwhopr -shared}} } */
 
 /* We used to ICE because of dangling pointers.  */