re PR c++/61564 (#pragma GCC optimize ("-fno-lto") causes the compiler to crash)

2016-06-07  Richard Biener  <rguenther@suse.de>

	PR c/61564
	* c-common.c (parse_optimize_options): Only apply CL_OPTIMIZATION
	options and warn about others.
	* common.opt (ffast-math): Make Optimization.

	* gcc.dg/Wpragmas-1.c: New testcase.
	* gcc.dg/Wattributes-4.c: Likewise.
	* gcc.dg/ipa/pr70646.c: Drop optimize pragma in favor of dg-option
	entry.

From-SVN: r237174

gcc/ChangeLog

@@ -1,3 +1,8 @@
+2016-06-07  Richard Biener  <rguenther@suse.de>
+
+	PR c/61564
+	* common.opt (ffast-math): Make Optimization.
+
 2016-06-07  Simon Dardis  <simon.dardis@imgtec.com>
 	    Prachi Godbole  <prachi.godbole@imgtec.com>
 

gcc/c-family/ChangeLog

@@ -1,3 +1,9 @@
+2016-06-07  Richard Biener  <rguenther@suse.de>
+
+	PR c/61564
+	* c-common.c (parse_optimize_options): Only apply CL_OPTIMIZATION
+	options and warn about others.
+
 2016-06-01  Eduard Sanou  <dhole@openmailbox.org>
 
 	* c-common.c (get_source_date_epoch): Rename to

gcc/c-family/c-common.c

@@ -9580,6 +9580,29 @@ parse_optimize_options (tree args, bool attr_p)
   decode_cmdline_options_to_array_default_mask (opt_argc, opt_argv,
 						&decoded_options,
 						&decoded_options_count);
+  /* Drop non-Optimization options.  */
+  unsigned j = 1;
+  for (i = 1; i < decoded_options_count; ++i)
+    {
+      if (! (cl_options[decoded_options[i].opt_index].flags & CL_OPTIMIZATION))
+	{
+	  ret = false;
+	  if (attr_p)
+	    warning (OPT_Wattributes,
+		     "bad option %s to optimize attribute",
+		     decoded_options[i].orig_option_with_args_text);
+	  else
+	    warning (OPT_Wpragmas,
+		     "bad option %s to pragma attribute",
+		     decoded_options[i].orig_option_with_args_text);
+	  continue;
+	}
+      if (i != j)
+	decoded_options[j] = decoded_options[i];
+      j++;
+    }
+  decoded_options_count = j;
+  /* And apply them.  */
   decode_options (&global_options, &global_options_set,
 		  decoded_options, decoded_options_count,
 		  input_location, global_dc);

gcc/common.opt

@@ -1287,7 +1287,7 @@ EnumValue
 Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
 
 ffast-math
-Common
+Common Optimization
 
 ffat-lto-objects
 Common Var(flag_fat_lto_objects)

gcc/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2016-06-07  Richard Biener  <rguenther@suse.de>
+
+	PR c/61564
+	* gcc.dg/Wpragmas-1.c: New testcase.
+	* gcc.dg/Wattributes-4.c: Likewise.
+	* gcc.dg/ipa/pr70646.c: Drop optimize pragma in favor of dg-option
+	entry.
+
 2016-06-07  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* gcc.target/aarch64/advsimd-intrinsics/p64_p128.c: Remove

gcc/testsuite/gcc.dg/Wattributes-4.c

@@ -0,0 +1,3 @@
+/* { dg-do compile } */
+
+int __attribute__((optimize("no-lto"))) main(void){return 0;} /* { dg-warning "bad option" } */

gcc/testsuite/gcc.dg/Wpragmas-1.c

@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+
+#pragma GCC push_options
+#pragma GCC optimize ("-fno-lto") /* { dg-warning "bad option" } */
+int main(void){return 0;}
+#pragma GCC pop_options
+
+/* ???  The FEs still apply the pragma string as optimize attribute to
+   all functions thus the diagnostic will be repeated for each function
+   affected.  */
+/* { dg-message "bad option" "" { target *-*-* } 0 } */

gcc/testsuite/gcc.dg/ipa/pr70646.c

@@ -1,7 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -fno-unit-at-a-time" } */
-
-#pragma GCC optimize("no-unit-at-a-time")
 
 typedef unsigned char u8;
 typedef unsigned long long u64;