| # SPDX-License-Identifier: GPL-2.0-only |
| # Kconfig helper macros |
| |
| # Convenient variables |
| comma := , |
| quote := " |
| squote := ' |
| empty := |
| space := $(empty) $(empty) |
| dollar := $ |
| right_paren := ) |
| left_paren := ( |
| |
| # $(if-success,<command>,<then>,<else>) |
| # Return <then> if <command> exits with 0, <else> otherwise. |
| if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)") |
| |
| # $(success,<command>) |
| # Return y if <command> exits with 0, n otherwise |
| success = $(if-success,$(1),y,n) |
| |
| # $(failure,<command>) |
| # Return n if <command> exits with 0, y otherwise |
| failure = $(if-success,$(1),n,y) |
| |
| # $(cc-option,<flag>) |
| # Return y if the compiler supports <flag>, n otherwise |
| cc-option = $(success,mkdir .tmp_$$$$; trap "rm -rf .tmp_$$$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$$$/tmp.o) |
| |
| # $(ld-option,<flag>) |
| # Return y if the linker supports <flag>, n otherwise |
| ld-option = $(success,$(LD) -v $(1)) |
| |
| # $(as-instr,<instr>) |
| # Return y if the assembler supports <instr>, n otherwise |
| as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -) |
| |
| # check if $(CC) and $(LD) exist |
| $(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found) |
| $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found) |
| |
| # Get the compiler name, version, and error out if it is not supported. |
| cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC)) |
| $(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not supported.) |
| cc-name := $(shell,set -- $(cc-info) && echo $1) |
| cc-version := $(shell,set -- $(cc-info) && echo $2) |
| |
| # Get the linker name, version, and error out if it is not supported. |
| ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD)) |
| $(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.) |
| ld-name := $(shell,set -- $(ld-info) && echo $1) |
| ld-version := $(shell,set -- $(ld-info) && echo $2) |
| |
| # machine bit flags |
| # $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise. |
| # $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise. |
| cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1)) |
| m32-flag := $(cc-option-bit,-m32) |
| m64-flag := $(cc-option-bit,-m64) |
