startswith: Fix offloading targets.

gcc/ChangeLog:

	* config/gcn/mkoffload.c (STR): Redefine.
	* config/i386/intelmic-mkoffload.c (STR): Likewise.
	* config/nvptx/mkoffload.c (STR): Likewise.
diff --git a/gcc/config/gcn/mkoffload.c b/gcc/config/gcn/mkoffload.c
index 5432f95..1469a68 100644
--- a/gcc/config/gcn/mkoffload.c
+++ b/gcc/config/gcn/mkoffload.c
@@ -825,7 +825,8 @@
   bool fpic = false;
   for (int i = 1; i < argc; i++)
     {
-      if (startswith (argv[i], "-foffload-abi="))
+#define STR "-foffload-abi="
+      if (startswith (argv[i], STR))
 	{
 	  if (strcmp (argv[i] + strlen (STR), "lp64") == 0)
 	    offload_abi = OFFLOAD_ABI_LP64;
@@ -835,6 +836,7 @@
 	    fatal_error (input_location,
 			 "unrecognizable argument of option " STR);
 	}
+#undef STR
       else if (strcmp (argv[i], "-fopenmp") == 0)
 	fopenmp = true;
       else if (strcmp (argv[i], "-fopenacc") == 0)
diff --git a/gcc/config/i386/intelmic-mkoffload.c b/gcc/config/i386/intelmic-mkoffload.c
index cb946d6..03858e6 100644
--- a/gcc/config/i386/intelmic-mkoffload.c
+++ b/gcc/config/i386/intelmic-mkoffload.c
@@ -613,7 +613,8 @@
   /* Scan the argument vector.  */
   for (int i = 1; i < argc; i++)
     {
-      if (startswith (argv[i], "-foffload-abi="))
+#define STR "-foffload-abi="
+      if (startswith (argv[i], STR))
 	{
 	  if (strcmp (argv[i] + strlen (STR), "lp64") == 0)
 	    offload_abi = OFFLOAD_ABI_LP64;
@@ -623,6 +624,7 @@
 	    fatal_error (input_location,
 			 "unrecognizable argument of option " STR);
 	}
+#undef STR
       else if (strcmp (argv[i], "-save-temps") == 0)
 	save_temps = true;
       else if (strcmp (argv[i], "-v") == 0)
diff --git a/gcc/config/nvptx/mkoffload.c b/gcc/config/nvptx/mkoffload.c
index c46c85d..17f17e5 100644
--- a/gcc/config/nvptx/mkoffload.c
+++ b/gcc/config/nvptx/mkoffload.c
@@ -481,7 +481,8 @@
   bool fpic = false;
   for (int i = 1; i < argc; i++)
     {
-      if (startswith (argv[i], "-foffload-abi="))
+#define STR "-foffload-abi="
+      if (startswith (argv[i], STR))
 	{
 	  if (strcmp (argv[i] + strlen (STR), "lp64") == 0)
 	    offload_abi = OFFLOAD_ABI_LP64;
@@ -491,6 +492,7 @@
 	    fatal_error (input_location,
 			 "unrecognizable argument of option " STR);
 	}
+#undef STR
       else if (strcmp (argv[i], "-fopenmp") == 0)
 	fopenmp = true;
       else if (strcmp (argv[i], "-fopenacc") == 0)