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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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# cc-cross-prefix# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)# Return first <prefix> where a <prefix>gcc is found in PATH.# If no gcc found in PATH with listed prefixes return nothing## Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it# would try to directly execute the shell builtin 'command'. This workaround# should be kept for a long time since this issue was fixed only after the# GNU Make 4.2.1 release.cc-cross-prefix = $(firstword $(foreach c, $(1), \ $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
# output directory for tests belowTMPOUT = .tmp_$$$$
# try-run# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)# Exit code chooses option. "$$TMP" serves as a temporary file and is# automatically cleaned up.try-run = $(shell set -e; \ TMP=$(TMPOUT)/tmp; \ trap "rm -rf $(TMPOUT)" EXIT; \ mkdir -p $(TMPOUT); \ if ($(1)) >/dev/null 2>&1; \ then echo "$(2)"; \ else echo "$(3)"; \ fi)
# as-option# Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
as-option = $(call try-run,\ $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2))
# as-instr# Usage: aflags-y += $(call as-instr,instr,option1,option2)
as-instr = $(call try-run,\ printf "%b\n" "$(1)" | $(CC) -Werror $(CLANG_FLAGS) $(KBUILD_AFLAGS) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3))
# __cc-option# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)__cc-option = $(call try-run,\ $(1) -Werror $(2) $(3:-Wno-%=-W%) -c -x c /dev/null -o "$$TMP",$(3),$(4))
# cc-option# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
cc-option = $(call __cc-option, $(CC),\ $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
# cc-option-yn# Usage: flag := $(call cc-option-yn,-march=winchip-c6)cc-option-yn = $(if $(call cc-option,$1),y,n)
# cc-disable-warning# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)cc-disable-warning = $(call cc-option,-Wno-$(strip $1))
# gcc-min-version# Usage: cflags-$(call gcc-min-version, 110100) += -foogcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1)
# clang-min-version# Usage: cflags-$(call clang-min-version, 110000) += -fooclang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1)
# rustc-min-version# Usage: rustc-$(call rustc-min-version, 108500) += -Cfoorustc-min-version = $(call test-ge, $(CONFIG_RUSTC_VERSION), $1)
# ld-option# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
# __rustc-option# Usage: MY_RUSTFLAGS += $(call __rustc-option,$(RUSTC),$(MY_RUSTFLAGS),-Cinstrument-coverage,-Zinstrument-coverage)# TODO: remove RUSTC_BOOTSTRAP=1 when we raise the minimum GNU Make version to 4.4__rustc-option = $(call try-run,\ echo '$(pound)![allow(missing_docs)]$(pound)![feature(no_core)]$(pound)![no_core]' | RUSTC_BOOTSTRAP=1\ $(1) --sysroot=/dev/null $(KBUILD_RUSTFLAGS_OPTION_CHKS) $(filter-out --sysroot=/dev/null --target=%target.json,$(2)) $(3)\ --crate-type=rlib --out-dir=$(TMPOUT) --emit=obj=- - >/dev/null,$(3),$(4))
# rustc-option# Usage: rustflags-y += $(call rustc-option,-Cinstrument-coverage,-Zinstrument-coverage)rustc-option = $(call __rustc-option, $(RUSTC),\ $(KBUILD_RUSTFLAGS),$(1),$(2))
# rustc-option-yn# Usage: flag := $(call rustc-option-yn,-Cinstrument-coverage)rustc-option-yn = $(if $(call rustc-option,$1),y,n)