gcc abi env var

gcc-abi.diff

$NetBSD$

--- gcc/common/config/i386/i386-common.c.orig   2011-12-22 14:39:35.000000000 +0000
+++ gcc/common/config/i386/i386-common.c
@@ -160,6 +160,18 @@ ix86_handle_option (struct gcc_options *
 {
   size_t code = decoded->opt_index;
   int value = decoded->value;
+  const char *abi;
+
+  /* ABI environment variable takes precedence. */
+  if ((abi = getenv("ABI")) != NULL) {
+    if (strcmp(abi, "32") == 0 || strcmp(abi, "i86") == 0) {
+      opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_64BIT;
+      opts->x_ix86_isa_flags_explicit &= ~OPTION_MASK_ISA_64BIT;
+    } else if (strcmp(abi, "64") == 0 || strcmp(abi, "amd64") == 0) {
+      opts->x_ix86_isa_flags |= OPTION_MASK_ISA_64BIT;
+      opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_64BIT;
+    }
+  }

   switch (code)
     {