1 # The -mdynamic-no-pic ensures that the compiler executable is built without 2 # position-independent-code -- the usual default on Darwin. This speeds compiles 3 # by 8-20% (measurements made against GCC-11). 4 # However, we cannot add it unless the bootstrap compiler supports 5 # -mno-dynamic-no-pic to undo it, since libiberty, at least, needs this. 6 7 #We use Werror, since some versions of clang report unknown command line flags 8 # as a warning only. 9 10 # We only need to determine this for the host tool used to build stage1 (or a 11 # non-bootstrapped compiler), later stages will be built by GCC which supports 12 # the required flags. 13 14 # We cannot use mdynamic-no-pic when building shared host resources. 15 16 ifeq (${host_shared},no) 17 BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC := $(shell \ 18 $(CC) -S -xc /dev/null -o /dev/null -Werror -mno-dynamic-no-pic 2>/dev/null \ 19 && echo true) 20 else 21 BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC := false 22 endif 23 24 @if gcc-bootstrap 25 ifeq (${BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC},true) 26 STAGE1_CFLAGS += -mdynamic-no-pic 27 else 28 STAGE1_CFLAGS += -fPIC 29 endif 30 ifeq (${host_shared},no) 31 # Add -mdynamic-no-pic to later stages when we know it is built with GCC. 32 BOOT_CFLAGS += -mdynamic-no-pic 33 endif 34 @endif gcc-bootstrap 35 36 @unless gcc-bootstrap 37 ifeq (${BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC},true) 38 # FIXME: we should also enable this for cross and non-bootstrap builds but 39 # that needs amendment to libcc1. 40 # CFLAGS += -mdynamic-no-pic 41 # CXXFLAGS += -mdynamic-no-pic 42 else 43 CFLAGS += -fPIC 44 CXXFLAGS += -fPIC 45 endif 46 @endunless gcc-bootstrap 47
Indexes created Wed Apr 29 00:23:26 UTC 2026