mh-darwin (BOOT_CFLAGS): Only add -mdynamic-no-pic for m32 hosts.

config:

	* mh-darwin (BOOT_CFLAGS): Only add -mdynamic-no-pic for m32 hosts.
	(STAGE1_CFLAGS, STAGE1_LDFLAGS): New.
	Fix over-length lines and amend comments.

From-SVN: r203017

config/ChangeLog

+2013-09-29  Iain Sandoe  <iain@codesourcery.com>
+
+	* mh-darwin (BOOT_CFLAGS): Only add -mdynamic-no-pic for m32 hosts.
+	(STAGE1_CFLAGS, STAGE1_LDFLAGS): New.
+	Fix over-length lines and amend comments.
+
 2013-08-30  Marek Polacek  <polacek@redhat.com>
 
 	* bootstrap-ubsan.mk: New.

config/mh-darwin

 # The -mdynamic-no-pic ensures that the compiler executable is built without
 # position-independent-code -- the usual default on Darwin. This fix speeds
 # compiles by 3-5%.
-BOOT_CFLAGS += -mdynamic-no-pic
+BOOT_CFLAGS += \
+`case ${host} in i?86-*-darwin* | powerpc-*-darwin*) \
+                 echo -mdynamic-no-pic ;; esac;`
 
-# Ensure we don't try and use -pie, as it is incompatible with pch.
-BOOT_LDFLAGS += `case ${host} in *-*-darwin[1][1-9]*) echo -Wl,-no_pie ;; esac;`
+# ld on Darwin versions >= 10.7 defaults to PIE executables. Disable this for
+# gcc components, since it is incompatible with our pch implementation.
+BOOT_LDFLAGS += \
+`case ${host} in *-*-darwin[1][1-9]*) echo -Wl,-no_pie ;; esac;`
+
+# Similarly, for cross-compilation.
+STAGE1_CFLAGS += \
+`case ${host} in i?86-*-darwin* | powerpc-*-darwin*)\
+                 echo -mdynamic-no-pic ;; esac;`
+STAGE1_LDFLAGS += \
+`case ${host} in *-*-darwin[1][1-9]*) echo -Wl,-no_pie ;; esac;`