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c841db9538
This makes the host_shared value available to host makefile fragments. It uses this to adjust Darwin's mdynamic-no-pic in the case that shared host resources are required. Signed-off-by: Iain Sandoe <iain@sandoe.co.uk> config/ * mh-darwin: Require a non-shared host configuration to enable mdynamic-no-pic where that is supported.
47 lines
1.5 KiB
Plaintext
47 lines
1.5 KiB
Plaintext
# The -mdynamic-no-pic ensures that the compiler executable is built without
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# position-independent-code -- the usual default on Darwin. This speeds compiles
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# by 8-20% (measurements made against GCC-11).
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# However, we cannot add it unless the bootstrap compiler supports
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# -mno-dynamic-no-pic to undo it, since libiberty, at least, needs this.
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# We use Werror, since some versions of clang report unknown command line flags
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# as a warning only.
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# We only need to determine this for the host tool used to build stage1 (or a
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# non-bootstrapped compiler), later stages will be built by GCC which supports
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# the required flags.
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# We cannot use mdynamic-no-pic when building shared host resources.
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ifeq (${host_shared},no)
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BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC := $(shell \
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$(CC) -S -xc /dev/null -o /dev/null -Werror -mno-dynamic-no-pic 2>/dev/null \
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&& echo true)
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else
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BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC := false
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endif
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@if gcc-bootstrap
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ifeq (${BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC},true)
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STAGE1_CFLAGS += -mdynamic-no-pic
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else
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STAGE1_CFLAGS += -fPIC
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endif
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ifeq (${host_shared},no)
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# Add -mdynamic-no-pic to later stages when we know it is built with GCC.
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BOOT_CFLAGS += -mdynamic-no-pic
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endif
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@endif gcc-bootstrap
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@unless gcc-bootstrap
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ifeq (${BOOTSTRAP_TOOL_CAN_USE_MDYNAMIC_NO_PIC},true)
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# FIXME: we should also enable this for cross and non-bootstrap builds but
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# that needs amendment to libcc1.
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# CFLAGS += -mdynamic-no-pic
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# CXXFLAGS += -mdynamic-no-pic
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else
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CFLAGS += -fPIC
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CXXFLAGS += -fPIC
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endif
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@endunless gcc-bootstrap
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