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74 lines
2.7 KiB
74 lines
2.7 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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# cc-cross-prefix |
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# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) |
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# Return first <prefix> where a <prefix>gcc is found in PATH. |
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# If no gcc found in PATH with listed prefixes return nothing |
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# |
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# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it |
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# would try to directly execute the shell builtin 'command'. This workaround |
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# should be kept for a long time since this issue was fixed only after the |
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# GNU Make 4.2.1 release. |
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cc-cross-prefix = $(firstword $(foreach c, $(1), \ |
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$(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) |
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# output directory for tests below |
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TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$ |
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# try-run |
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# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) |
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# Exit code chooses option. "$$TMP" serves as a temporary file and is |
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# automatically cleaned up. |
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try-run = $(shell set -e; \ |
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TMP=$(TMPOUT)/tmp; \ |
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mkdir -p $(TMPOUT); \ |
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trap "rm -rf $(TMPOUT)" EXIT; \ |
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if ($(1)) >/dev/null 2>&1; \ |
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then echo "$(2)"; \ |
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else echo "$(3)"; \ |
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fi) |
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# as-option |
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# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
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as-option = $(call try-run,\ |
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$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) |
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# as-instr |
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# Usage: cflags-y += $(call as-instr,instr,option1,option2) |
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as-instr = $(call try-run,\ |
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printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) |
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# __cc-option |
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# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) |
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__cc-option = $(call try-run,\ |
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$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) |
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# cc-option |
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# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
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cc-option = $(call __cc-option, $(CC),\ |
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$(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2)) |
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# cc-option-yn |
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# Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
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cc-option-yn = $(call try-run,\ |
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$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) |
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# cc-disable-warning |
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# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) |
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cc-disable-warning = $(call try-run,\ |
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$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
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# cc-ifversion |
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# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
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cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4)) |
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# ld-option |
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# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) |
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ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) |
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# ld-ifversion |
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# Usage: $(call ld-ifversion, -ge, 22252, y) |
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ld-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4))
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