@@ -1,18 +1,29 @@
# 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 += \
+# compiles by 3-5%. Don't add it if the compiler doesn't also support
+# -mno-dynamic-no-pic to undo it.
+DARWIN_MDYNAMIC_NO_PIC := \
`case ${host} in i?86-*-darwin* | powerpc-*-darwin*) \
- echo -mdynamic-no-pic ;; esac;`
+ $(CC) -S -xc /dev/null -o /dev/null -mno-dynamic-no-pic 2>/dev/null \
+ && echo -mdynamic-no-pic ;; esac`
+DARWIN_GCC_MDYNAMIC_NO_PIC := \
+`case ${host} in i?86-*-darwin* | powerpc-*-darwin*) \
+ $(CC) -S -xc /dev/null -o /dev/null -mno-dynamic-no-pic 2>/dev/null \
+ || echo -mdynamic-no-pic ;; 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;`
+DARWIN_NO_PIE := `case ${host} in *-*-darwin[1][1-9]*) echo -Wl,-no_pie ;; esac;`
+
+BOOT_CFLAGS += $(DARWIN_MDYNAMIC_NO_PIC)
+BOOT_LDFLAGS += $(DARWIN_NO_PIE)
# 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;`
+STAGE1_CFLAGS += $(DARWIN_MDYNAMIC_NO_PIC)
+STAGE1_LDFLAGS += $(DARWIN_NO_PIE)
+
+# Without -mno-dynamic-no-pic support, add -mdynamic-no-pic just to later
+# stages when we know it is built with gcc.
+STAGE2_CFLAGS += $(DARWIN_GCC_MDYNAMIC_NO_PIC)
+STAGE3_CFLAGS += $(DARWIN_GCC_MDYNAMIC_NO_PIC)
+STAGE4_CFLAGS += $(DARWIN_GCC_MDYNAMIC_NO_PIC)
@@ -7,11 +7,15 @@ AC_DEFUN([_GCC_PICFLAG], [
case "${$2}" in
# PIC is the default on some targets or must not be used.
*-*-darwin*)
- # PIC is the default on this platform
- # Common symbols not allowed in MH_DYLIB files
- # Cancel any earlier -mdynamic-no-pic, as that makes
- # the code not suitable for shared libraries.
- $1='-fno-common -mno-dynamic-no-pic'
+ # For darwin, common symbols are not allowed in MH_DYLIB files
+ case "${CFLAGS}" in
+ # If we are using a compiler supporting mdynamic-no-pic
+ # and the option has been tested as safe to add, then cancel
+ # it here, since the code generated is incompatible with shared
+ # libs.
+ *-mdynamic-no-pic*) $1='-fno-common -mno-dynamic-no-pic' ;;
+ *) $1=-fno-common ;;
+ esac
;;
alpha*-dec-osf5*)
# PIC is the default.