re PR testsuite/62250 (FAIL: gfortran.dg/coarray/alloc_comp_1.f90 -fcoarray=lib -O2 -lcaf_single)

	PR testsuite/62250
	* lib/target-supports.exp (check_effective_target_libatomic_available):
	New.
	* gfortran.dg/coarray/caf.exp: Only add -latomic for
	targets that match effective-target libatomic_available.
	* gfortran.dg/coarray_lib_comm_1.f90: Similar.

From-SVN: r219364

gcc/testsuite/ChangeLog

+2015-01-08  Hans-Peter Nilsson  <hp@axis.com>
+
+	PR testsuite/62250
+	* lib/target-supports.exp (check_effective_target_libatomic_available):
+	New.
+	* gfortran.dg/coarray/caf.exp: Only add -latomic for
+	targets that match effective-target libatomic_available.
+	* gfortran.dg/coarray_lib_comm_1.f90: Similar.
+
 2015-01-08  David Malcolm  <dmalcolm@redhat.com>
 
 	* jit.dg/test-error-block-in-wrong-function.c (verify_code):

gcc/testsuite/gfortran.dg/coarray/caf.exp

@@ -58,6 +58,12 @@ proc dg-compile-aux-modules { args } {
     # cleanup-modules isn't intentionally invoked here.
 }
 
+# Add -latomic only where supported.  Assume built-in support elsewhere.
+set maybe_atomic_lib ""
+if [check_effective_target_libatomic_available] {
+    set maybe_atomic_lib "-latomic"
+}
+
 # Main loop.
 foreach test [lsort [glob -nocomplain $srcdir/$subdir/*.\[fF\]{,90,95,03,08} ]] {
     # If we're only testing specific files and this isn't one of them, skip it.
@@ -81,14 +87,14 @@ foreach test [lsort [glob -nocomplain $srcdir/$subdir/*.\[fF\]{,90,95,03,08} ]]
     foreach flags $option_list {
 	verbose "Testing $nshort (single), $flags" 1
         set gfortran_aux_module_flags "-fcoarray=single $flags"
-	dg-test $test "-fcoarray=single $flags -latomic" "" 
+	dg-test $test "-fcoarray=single $flags $maybe_atomic_lib" "" 
 	cleanup-modules ""
     }
 
     foreach flags $option_list {
 	verbose "Testing $nshort (libcaf_single), $flags" 1
         set gfortran_aux_module_flags "-fcoarray=lib $flags -lcaf_single"
-	dg-test $test "-fcoarray=lib $flags -lcaf_single -latomic" ""
+	dg-test $test "-fcoarray=lib $flags -lcaf_single $maybe_atomic_lib" ""
 	cleanup-modules ""
     }
 }

gcc/testsuite/lib/target-supports.exp

@@ -1128,6 +1128,13 @@ proc check_libcilkrts_available { } {
 	} "-fcilkplus -lcilkrts" ]
 }
 
+# Return true if the atomic library is supported on the target.
+proc check_effective_target_libatomic_available { } {
+    return [check_no_compiler_messages libatomic_available executable {
+	int main (void) { return 0; }
+    } "-latomic"]
+}
+
 # Return 1 if an ASCII locale is supported on this host, 0 otherwise.
 
 proc check_ascii_locale_available { } {