diff options
Diffstat (limited to 'build/flags-if.sh')
| -rwxr-xr-x | build/flags-if.sh | 73 |
1 files changed, 61 insertions, 12 deletions
diff --git a/build/flags-if.sh b/build/flags-if.sh index 81eb345..4cbfbc9 100755 --- a/build/flags-if.sh +++ b/build/flags-if.sh @@ -3,26 +3,75 @@ # Copyright © Tavian Barnes <tavianator@tavianator.com> # SPDX-License-Identifier: 0BSD -# Add flags to a makefile if a build succeeds +# Add flags to a makefile if a build succeeds. Source files can specify their +# own flags with lines like +# +# /// _CFLAGS += -Wmissing-variable-declarations +# +# which will be added to the makefile on success, or lines like +# +# /// -Werror +# +# which are just used for the current file. Lines like +# +# /// --- +# +# separate groups of flags, to try multiple ways to achieve something, e.g. +# +# /// CFLAGS += -pthread +# /// --- +# /// LDLIBS += -lpthread set -eu -build/cc.sh "$@" || exit 1 +# Any new flags we're using +FLAGS="" +# Any new makefile lines we're printing +OUTPUT="" -# If the build succeeded, print any lines like -# -# /// _CFLAGS += -foo -# -# (unless they're already set) -OLD_FLAGS="$XCC $XCPPFLAGS $XCFLAGS $XLDFLAGS $XLDLIBS" +# Check the existing flags so we don't add duplicates +OLD_FLAGS=" $XCPPFLAGS $XCFLAGS $XLDFLAGS $XLDLIBS " + +add_flag() { + if [ "${OLD_FLAGS#* $1 }" = "$OLD_FLAGS" ]; then + FLAGS="${FLAGS}${FLAGS:+ }$1" + else + return 1 + fi +} + +try_cc() { + build/cc.sh "$@" $FLAGS || return $? + printf '%s' "$OUTPUT" + exit +} while IFS="" read -r line; do case "$line" in - ///*=*) - flag="${line#*= }" - if [ "${OLD_FLAGS#*"$flag"}" = "$OLD_FLAGS" ]; then - printf '%s\n' "${line#/// }" + "/// "*) + line="${line#/// }" + ;; + *) + continue + ;; + esac + + case "$line" in + ---) + try_cc "$@" || : + FLAGS= + OUTPUT= + ;; + *=*) + if add_flag "${line#*= }"; then + OUTPUT="${OUTPUT}${line} +" fi ;; + *) + add_flag "$line" || : + ;; esac done <"$1" + +try_cc "$@" |