Handle failure to determine pointer provenance conservatively [PR104069].

[thirdparty/gcc.git] / config / mh-darwin

# The -mdynamic-no-pic ensures that the compiler executable is built without
# position-independent-code -- the usual default on Darwin. This speeds compiles
# by 8-20% (measurements made against GCC-11).
# However, we cannot add it unless the bootstrap compiler supports
# -mno-dynamic-no-pic to undo it, since libiberty, at least, needs this.

# We use Werror, since some versions of clang report unknown command line flags
# as a warning only.

# We only need to determine this for the host tool used to build stage1 (or a
# non-bootstrapped compiler), later stages will be built by GCC which supports
# the required flags.

# We cannot use mdynamic-no-pic when building shared host resources.

ifeq (${host_shared},no)
BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC := $(shell \
  $(CC) -S -xc /dev/null -o /dev/null -Werror -mno-dynamic-no-pic 2>/dev/null \
  && echo true)
else
BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC := false
endif

@if gcc-bootstrap
ifeq (${BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC},true)
STAGE1_CFLAGS += -mdynamic-no-pic
else
STAGE1_CFLAGS += -fPIC
endif
ifeq (${host_shared},no)
# Add -mdynamic-no-pic to later stages when we know it is built with GCC.
BOOT_CFLAGS += -mdynamic-no-pic
endif
@endif gcc-bootstrap

@unless gcc-bootstrap
ifeq (${BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC},true)
# FIXME: we should also enable this for cross and non-bootstrap builds but
# that needs amendment to libcc1.
# CFLAGS += -mdynamic-no-pic
# CXXFLAGS += -mdynamic-no-pic
else
CFLAGS += -fPIC
CXXFLAGS += -fPIC
endif
@endunless gcc-bootstrap