1# SPDX-License-Identifier: GPL-2.0-only 2# Kconfig helper macros 3 4# Convenient variables 5comma := , 6quote := " 7squote := ' 8empty := 9space := $(empty) $(empty) 10dollar := $ 11right_paren := ) 12left_paren := ( 13 14# $(if-success,<command>,<then>,<else>) 15# Return <then> if <command> exits with 0, <else> otherwise. 16if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)") 17 18# $(success,<command>) 19# Return y if <command> exits with 0, n otherwise 20success = $(if-success,$(1),y,n) 21 22# $(failure,<command>) 23# Return n if <command> exits with 0, y otherwise 24failure = $(if-success,$(1),n,y) 25 26# $(cc-probe,<flag>) 27# The command $(cc-option) and $(cc-option-str) test <flag> with. Not meant 28# to be called directly; use one of those two instead. 29cc-probe = trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(shell,echo $(1) | sed "s;^-Wno-;-W;") -c -x c /dev/null -o .tmp_$$/tmp.o 30 31# $(cc-option,<flag>) 32# Return y if the compiler supports <flag>, n otherwise 33cc-option = $(success,$(cc-probe,$(1))) 34 35# $(cc-option-str,<flag>[,<fallback>]) 36# Return <flag> if the compiler supports it, <fallback> otherwise. 37# <fallback> defaults to an empty string and is returned untested. 38cc-option-str = $(if-success,$(cc-probe,$(1)),$(1),$(2)) 39 40# $(ld-probe,<flag>) 41# The command $(ld-option) and $(ld-option-str) test <flag> with. Not meant 42# to be called directly; use one of those two instead. 43ld-probe = $(LD) -v $(1) 44 45# $(ld-option,<flag>) 46# Return y if the linker supports <flag>, n otherwise 47ld-option = $(success,$(ld-probe,$(1))) 48 49# $(ld-option-str,<flag>[,<fallback>]) 50# Return <flag> if the linker supports it, <fallback> otherwise. 51# <fallback> defaults to an empty string and is returned untested. 52ld-option-str = $(if-success,$(ld-probe,$(1)),$(1),$(2)) 53 54# $(as-instr,<instr>) 55# Return y if the assembler supports <instr>, n otherwise 56as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) $(2) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -o /dev/null -) 57as-instr64 = $(as-instr,$(1),$(m64-flag)) 58 59# check if $(CC) and $(LD) exist 60$(error-if,$(failure,command -v $(CC)),C compiler '$(CC)' not found) 61$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found) 62 63# Get the C compiler name, version, and error out if it is not supported. 64cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC)) 65$(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this C compiler is not supported.) 66cc-name := $(shell,set -- $(cc-info) && echo $1) 67cc-version := $(shell,set -- $(cc-info) && echo $2) 68 69# Get the assembler name, version, and error out if it is not supported. 70as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS)) 71$(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.) 72as-name := $(shell,set -- $(as-info) && echo $1) 73as-version := $(shell,set -- $(as-info) && echo $2) 74 75# Get the linker name, version, and error out if it is not supported. 76ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD)) 77$(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.) 78ld-name := $(shell,set -- $(ld-info) && echo $1) 79ld-version := $(shell,set -- $(ld-info) && echo $2) 80 81# machine bit flags 82# $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise. 83# $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise. 84m32-flag := $(cc-option-str,-m32) 85m64-flag := $(cc-option-str,-m64) 86 87# Test whether the compiler can link userspace applications 88cc_can_link_user = $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(1)) 89 90rustc-version := $(shell,$(srctree)/scripts/rustc-version.sh $(RUSTC)) 91rustc-llvm-version := $(shell,$(srctree)/scripts/rustc-llvm-version.sh $(RUSTC)) 92 93# $(rustc-option,<flag>) 94# Return y if the Rust compiler supports <flag>, n otherwise 95# If you are testing for unstable features, consider testing RUSTC_VERSION 96# instead, as features may have different completeness while available. 97rustc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(RUSTC) $(1) --crate-type=rlib /dev/null --out-dir=.tmp_$$ -o .tmp_$$/tmp.rlib) 98