ld-plugin/lto.exp: Disable ld/12942 test for gcc < 4.7.0.

The test for ld/12942 fails with gcc versions before 4.7.0. This patch
disables this test with these versions of gcc.

ld/testsuite/ChangeLog:

2013-04-29  Will Newton  <will.newton@linaro.org>

	* ld-plugin/lto.exp: Disable ld/12942 test for gcc < 4.7.0.

2 files changed, 35 insertions, 19 deletions

diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index 7ed0242..0d1e999 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2013-04-29  Will Newton  <will.newton@linaro.org>
+
+	* ld-plugin/lto.exp: Disable ld/12942 test for gcc < 4.7.0.
+
 2013-04-22  Alan Modra  <amodra@gmail.com>
 
 	* ld-powerpc/tlsexe.d: Adjust for section id changes.
diff --git a/ld/testsuite/ld-plugin/lto.exp b/ld/testsuite/ld-plugin/lto.exp
index 09474a6..c5249f0 100644
--- a/ld/testsuite/ld-plugin/lto.exp
+++ b/ld/testsuite/ld-plugin/lto.exp
@@ -125,12 +125,6 @@ set lto_link_tests {
   {"PR ld/12760"
    "-O2 -Wl,-e,foo -nostdlib -flto -fuse-linker-plugin tmpdir/pr12760a.o -Wl,--start-group tmpdir/libpr12760.a -Wl,--end-group" ""
    {dummy.c} {} "pr12760.exe" "c" "warning: Bad bar"}
-  {"Build libdummy.a PR ld/12942 (1)"
-   "" "-flto -O2"
-   {pr12942a.cc pr12942c.cc} {} "libdummy.a" "c++"}
-  {"Build libdummy.a PR ld/12942 (2)"
-   "" "-O0"
-   {pr12942b.cc} {} "libdummy.a" "c++"}
   {"Build libpr13183.a"
    "-T" "-flto -O2"
    {pr13183a.c} {} "libpr13183.a"}
@@ -148,6 +142,17 @@ set lto_link_tests {
    {pr15323a.c} {} "libdummy.a" "c"}
 }
 
+if { [at_least_gcc_version 4 7] } {
+    set lto_link_tests [concat $lto_link_tests {
+      {"Build libdummy.a PR ld/12942 (1)"
+       "" "-flto -O2"
+       {pr12942a.cc pr12942c.cc} {} "libdummy.a" "c++"}
+      {"Build libdummy.a PR ld/12942 (2)"
+       "" "-O0"
+       {pr12942b.cc} {} "libdummy.a" "c++"}
+    }]
+}
+
 # Generate input files for complex LTO tests for ELF.
 set lto_link_elf_tests {
   {"Build libdummy.a 7"
@@ -257,12 +262,6 @@ set lto_run_tests {
   {"LTO 15"
    "-O2 -flto -fuse-linker-plugin -Wl,--start-group tmpdir/liblto-15.a tmpdir/lto-15a.o -Wl,--end-group" ""
    {dummy.c} "lto-15.exe" "lto-15.out" "" "c"}
-  {"PR ld/12942 (1)"
-   "-O2 -flto -fuse-linker-plugin tmpdir/pr12942a.o tmpdir/pr12942b.o" ""
-   {dummy.c} "pr12942a.exe" "pr12942.out" "" "c++"}
-  {"PR ld/12942 (2)"
-   "-O2 -flto -fuse-linker-plugin tmpdir/pr12942a.o tmpdir/pr12942c.o" ""
-   {dummy.c} "pr12942c.exe" "pr12942.out" "" "c++"}
   {"PR ld/13066"
    "-O2 -flto -fuse-linker-plugin" ""
    {pr13066.cc} "pr13066.exe" "pr13066.out" "" "c++"}
@@ -274,6 +273,17 @@ set lto_run_tests {
    {pr15323b.c} "pr15323.exe" "pr15323.out" "-flto -O2" "c"}
 }
 
+if { [at_least_gcc_version 4 7] } {
+    set lto_run_tests [concat $lto_run_tests {
+      {"PR ld/12942 (1)"
+       "-O2 -flto -fuse-linker-plugin tmpdir/pr12942a.o tmpdir/pr12942b.o" ""
+       {dummy.c} "pr12942a.exe" "pr12942.out" "" "c++"}
+      {"PR ld/12942 (2)"
+       "-O2 -flto -fuse-linker-plugin tmpdir/pr12942a.o tmpdir/pr12942c.o" ""
+       {dummy.c} "pr12942c.exe" "pr12942.out" "" "c++"}
+    }]
+}
+
 # LTO run-time tests for ELF
 set lto_run_elf_tests {
   {"LTO 7"
@@ -311,13 +321,15 @@ if {![string match "" $catch_output]} {
     return
 }
 
-# Check expected LTO linker errors.
-set testname "PR ld/12942 (3)"
-set exec_output [run_host_cmd "$CXX" "$gcc_gas_flag $gcc_ld_flag -O2 -flto -fuse-linker-plugin tmpdir/pr12942b.o tmpdir/pr12942a.o"]
-if { [ regexp "undefined reference to `link_error\\(\\)'" $exec_output ] } {
-    pass $testname
-} {
-    fail $testname
+if { [at_least_gcc_version 4 7] } {
+    # Check expected LTO linker errors.
+    set testname "PR ld/12942 (3)"
+    set exec_output [run_host_cmd "$CXX" "$gcc_gas_flag $gcc_ld_flag -O2 -flto -fuse-linker-plugin tmpdir/pr12942b.o tmpdir/pr12942a.o"]
+    if { [ regexp "undefined reference to `link_error\\(\\)'" $exec_output ] } {
+        pass $testname
+    } {
+        fail $testname
+    }
 }
 
 # Run "ld -r" to generate inputs for complex LTO tests.