128 lines
2 KiB
Bash
Executable file
128 lines
2 KiB
Bash
Executable file
#!/usr/bin/env sh
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# simple and flexible configure script for people who don't like to waste time
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# licensed to the public domain
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set -e
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mkf=config.mk
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# these also apply to all libraries in external/
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cflags='-std=c99'
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cppflags='-DLUA_USE_POSIX'
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ldflags='-lm'
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#
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## utility functions
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#
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present () {
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command -v "$1" 1>/dev/null 2>/dev/null
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}
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using () {
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printf "using $1\n"
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}
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throw () {
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>&2 printf "$(basename $0): $1\n"
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exit 1
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}
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#
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## flag generators
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#
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## C compiler
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gen_CC () {
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if ! [ -z "$cc" ]; then
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using "$cc"
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return 0
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fi
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if present clang; then
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cc=clang
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elif present cc; then
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cc=cc
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elif present gcc; then
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cc=gcc
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else
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throw "C compiler not found, please acquire a copy of LLVM Clang or the GNU C compiler"
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fi
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using "$cc"
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}
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## flags used in the compilation step
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gen_CFLAGS () {
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if [ -z "$debug" ]; then
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cflags="$cflags -O3"
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else
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cflags="$cflags -O0 -g"
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fi
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for flag in $cflags; do
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using "$flag"
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done
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}
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## flags used in the linking step
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gen_LDFLAGS () {
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if pkg-config readline; then
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ldflags="$ldflags $(pkg-config --libs readline)"
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fi
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if present ld.lld; then
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ldflags="$ldflags -fuse-ld=lld"
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elif present ld.gold; then
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ldflags="$ldflags -fuse-ld=gold"
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fi
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[ -z "$debug" ] && ldflags="$ldflags -Wl,--gc-sections"
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for flag in $ldflags; do
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using "$flag"
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done
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}
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#
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## command line interface
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#
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while getopts c:dhr ch; do
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case "$ch" in
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c) cc="$OPTARG" ;;
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d) debug=1 ;;
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r) unset debug ;;
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h)
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cat <<EOF
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configure: create an optimised makefile for the current environment
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options:
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-c: force use of a particular compiler
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-d: build in debug mode, with debug symbols enabled
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-r: build in release mode with optimisation flags enabled (default)
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-h: show this help message
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EOF
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exit 0
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;;
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?) exit 1 ;;
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:) exit 1 ;;
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esac
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done
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#
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## create the makefile
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#
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cd $(dirname $0)
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gen_CC
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gen_CFLAGS
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gen_LDFLAGS
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printf '# generated by configure
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_CC = %s
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_CFLAGS = %s
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_CPPFLAGS = %s
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_LDFLAGS =%s
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' \
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"$cc" \
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"$cflags" \
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"$cppflags"\
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"$ldflags" \
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>"$mkf"
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