config.mk generator

Makefile

Q := $(if $(filter 1,$(V) $(VERBOSE)),,@)

NAME := config.mk

$(NAME): variable_cc.mk variable_diagnostics.mk
	$Qrm -f tmp_$@
	$Qcat variable_*.mk > tmp_$@
	$Qmv tmp_$@ $@
	$Qecho "Configure OK!"
	$Qmake --no-print-directory clean
all: $(NAME)
clean:
	$Qrm -f tmp_*
fclean: clean
	$Qrm -rf $(NAME) variable_*.mk
re: fclean all
.PHONY: all clean fclean re

SUPPORTED_CC := $(foreach V,14 13 12 11 10 9 8 7,clang-$V) clang $(foreach V,11 10 9 8 7,gcc-$V) gcc
variable_cc.mk:
	$Qrm -f $@
	$Qecho "int main() {}" > tmp_$@.c
	$Q$Q${foreach CC,$(SUPPORTED_CC),($(CC) -c tmp_$@.c -o tmp_$@.o && echo "CC := $(CC)" >> $@) || }(echo "Failed to find any supported C compiler." && false)
	$Qrm -f tmp_$@.c tmp_$@.o

.PHONY: variable_diagnostics
# TODO: add diagnostics https://clang.llvm.org/docs/DiagnosticsReference.html#w-pragma-messages
DIAGNOSTICS_TO_USE := all extra extra-tokens ambiguous-member-template bind-to-temporary-copy
variable_diagnostics.mk: variable_cc.mk
	$Qrm -f tmp_$@
	$Qecho "int main() {}" > tmp_$@.c
	$Qecho "DIAGNOSTICS :=" > tmp_$@
	$Q$Q(sh -c "\$$(cut -c 7- < variable_cc.mk) -Werror -Wunknown-warning-option -Wthis-should-not-be-done-because-this-is-an-unknown-option -c tmp_$@.c -o tmp_$@.o" && echo "-Wunknown-warning-option not supported, skip detecting supported diagnostics") || (${foreach DIAGNOSTICS,$(DIAGNOSTICS_TO_USE),sh -c "\$$(cut -c 7- < variable_cc.mk) -Werror -Wunknown-warning-option -W$(DIAGNOSTICS) -c tmp_$@.c -o tmp_$@.o" && echo "DIAGNOSTICS += $(DIAGNOSTICS)" >> tmp_$@ ; })
	$Qmv tmp_$@ $@
	$Qrm -f tmp_$@.c tmp_$@.o