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| author | Tavian Barnes <tavianator@tavianator.com> | 2024-07-27 19:01:18 -0400 |
|---|---|---|
| committer | Tavian Barnes <tavianator@tavianator.com> | 2024-07-27 19:01:18 -0400 |
| commit | 3552b793e3b30f2bba0e77fbda45a86575f4dae6 (patch) | |
| tree | 1d42f3b79cde76874dcddb948c5c733e6b4bdcbb | |
| parent | bd8a345bed6b00f40547de44a1f76be2796f11be (diff) | |
| download | bfs-3552b793e3b30f2bba0e77fbda45a86575f4dae6.tar.xz | |
build/flags: Infrastructure to detect compiler flag support
Use it to detect -MD -MP support.
| -rw-r--r-- | build/deps.mk | 5 | ||||
| -rwxr-xr-x | build/flags-if.sh | 16 | ||||
| -rw-r--r-- | build/flags.mk | 20 | ||||
| -rw-r--r-- | build/flags/deps.c | 8 |
4 files changed, 44 insertions, 5 deletions
diff --git a/build/deps.mk b/build/deps.mk index a6ea673..b49e592 100644 --- a/build/deps.mk +++ b/build/deps.mk @@ -11,8 +11,5 @@ include build/exports.mk gen/deps.mk:: ${MSG} "[ GEN] $@" @printf '# %s\n' "$@" >$@ - @if build/cc.sh -MD -MP build/empty.c -o gen/.deps.out; then \ - printf '_CPPFLAGS += -MD -MP\n'; \ - fi >>$@ 2>$@.log - ${VCAT} $@ @printf -- '-include %s\n' ${OBJS:.o=.d} >>$@ + ${VCAT} $@ diff --git a/build/flags-if.sh b/build/flags-if.sh new file mode 100755 index 0000000..098b2d3 --- /dev/null +++ b/build/flags-if.sh @@ -0,0 +1,16 @@ +#!/bin/sh + +# Copyright © Tavian Barnes <tavianator@tavianator.com> +# SPDX-License-Identifier: 0BSD + +# Add flags to a makefile if a build succeeds + +set -eu + +FLAGS=$(sed -n '\|^///|{s|^/// ||; s|[^=]*= ||; p}' "$1") + +if build/cc.sh "$@" $FLAGS; then + sed -n 's|^/// \(.*=.*\)|\1|p' "$1" +else + exit 1 +fi diff --git a/build/flags.mk b/build/flags.mk index c50b077..95d5673 100644 --- a/build/flags.mk +++ b/build/flags.mk @@ -103,7 +103,11 @@ _LDLIBS := ${LDLIBS} ${EXTRA_LDLIBS} ${_LDLIBS} include build/exports.mk -gen/flags.mk:: +# Conditionally-supported flags +AUTO_FLAGS := \ + gen/flags/deps.mk + +gen/flags.mk: ${AUTO_FLAGS} ${MSG} "[ GEN] $@" @printf '# %s\n' "$@" >$@ @printf '_CPPFLAGS := %s\n' "$$XCPPFLAGS" >>$@ @@ -112,4 +116,18 @@ gen/flags.mk:: @printf '_LDLIBS := %s\n' "$$XLDLIBS" >>$@ @printf 'NOLIBS := %s\n' "$$XNOLIBS" >>$@ @test "${OS}-${SAN}" != FreeBSD-y || printf 'POSTLINK = elfctl -e +noaslr $$@\n' >>$@ + @cat ${.ALLSRC} >>$@ ${VCAT} $@ +.PHONY: gen/flags.mk + +# The short name of the config test +SLUG = ${@:gen/%.mk=%} +# The source file to build +CSRC = build/${SLUG}.c +# The hidden output file name +OUT = ${SLUG:flags/%=gen/flags/.%.out} + +${AUTO_FLAGS}:: + @${MKDIR} ${@D} + @build/flags-if.sh ${CSRC} -o ${OUT} >$@ 2>$@.log; \ + build/msg-if.sh "[ CC ] ${SLUG}.c" test $$? -eq 0 diff --git a/build/flags/deps.c b/build/flags/deps.c new file mode 100644 index 0000000..1c8c309 --- /dev/null +++ b/build/flags/deps.c @@ -0,0 +1,8 @@ +// Copyright © Tavian Barnes <tavianator@tavianator.com> +// SPDX-License-Identifier: 0BSD + +/// _CPPFLAGS += -MD -MP + +int main(void) { + return 0; +} |