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#!/usr/bin/env bash
set -e
# Ensure variables from the config aren't set before the config is read to
# avoid capturing transient state
unset {,T,H}{CC,CFLAGS,CPPFLAGS,LDFLAGS,LDLIBS} \
colour debug optimise verbose warn werror extra_targets
CFLAGS=(-std=c11)
TCFLAGS=(-fPIC)
warnings=(
-Wall -Wcast-align -Wcast-qual -Wextra -Wpedantic -Wformat=2
-Winit-self -Wmissing-prototypes -Wpointer-arith -Wshadow
-Wstrict-prototypes
)
declare -a {,T,H}{CFLAGS,CPPFLAGS,LDFLAGS,LDLIBS} extra_targets
if [ -e config.rc ]; then
redo-ifchange config.rc
. ./config.rc
else
redo-ifcreate config.rc
fi
check() {
what=$1
shift
for p do
if command -v "$p" >/dev/null 2>&1; then
echo "$p"
return
fi
done
echo "$what not set or found" >&2
return 1
}
CC=$(check '$CC, cc, gcc or clang' "$CC" cc gcc clang) || exit
if [[ $colour ]]; then
if [[ $colour != 1 ]]; then no=no-; fi
CFLAGS+=("-f${no}diagnostics-color")
LDFLAGS+=("-f${no}diagnostics-color")
fi
if [[ $debug ]]; then
CFLAGS+=(-Og -g)
LDFLAGS+=(-Og -g)
fi
if [[ $optimise ]]; then
TCFLAGS+=(-O2 -flto)
TLDFLAGS+=(-O2 -flto)
fi
if [[ $warn ]]; then
CFLAGS+=("${warnings[@]}")
if [[ $warn = 'gcc' ]]; then
CFLAGS+=(-Wsuggest-attribute=format -Wsuggest-attribute=noreturn)
fi
fi
if [[ $werror ]]; then
CFLAGS+=(-Werror)
fi
if [[ ! $TCC ]]; then TCC=$CC; fi
if [[ ! $HCC ]]; then HCC=$CC; fi
for p in T H; do
for v in CFLAGS CPPFLAGS LDFLAGS LDLIBS; do
eval "$p$v+=(\"\${$v[@]}\")"
done
done
{
echo "# generated by $0"
declare -p {T,H}{CC,CFLAGS,CPPFLAGS,LDFLAGS,LDLIBS} extra_targets
} >"$3"
if [[ $verbose ]]; then
echo "# Configuration regenerated:" >&2
cat "$3" >&2
fi
|
