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make: Place most configuration macros in a separate file instead of on the command linepr/spi.typo
Joakim Nohlgård
7 years ago
committed by
GitHub
6 changed files with 131 additions and 21 deletions
@ -0,0 +1,14 @@
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genconfigheader.sh |
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------------------ |
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Usage: `genconfigheader.sh <output_header_file> [CFLAGS]` |
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Generate a build configuration header from CFLAGS arguments |
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- Arguments on the form `-Dmacro_name=macro_value` will be converted to |
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the form `#define macro_name macro_value` |
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- Arguments given on the form `-Dmacro_name` will be converted to the form `#define macro_name 1` |
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- The output file will be overwritten if it already exists _and_ the new output file's contents differs from the old file. |
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By not replacing the output file on every run, make can still use the file |
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modification times for dependency calculations. |
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@ -0,0 +1,84 @@
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#!/bin/sh |
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# |
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# Copyright (C) 2016 Eistec AB |
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# |
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# This file is subject to the terms and conditions of the GNU Lesser General |
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# Public License v2.1. See the file LICENSE in the top level directory for more |
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# details. |
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# |
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DEBUG=0 |
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if [ "${QUIET}" != "1" ]; then |
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DEBUG=1 |
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fi |
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if [ $# -lt 1 ]; then |
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echo "Usage: $0 <output.h> [CFLAGS]..." |
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echo "Extract all macros from CFLAGS and generate a header file" |
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exit 1 |
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fi |
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OUTPUTFILE="$1" |
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shift |
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MD5SUM=md5sum |
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if [ "$(uname -s)" = "Darwin" ]; then |
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MD5SUM=md5 -r |
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fi |
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# atomically update the file |
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TMPFILE= |
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trap '[ -n "${TMPFILE}" ] && rm -f "${TMPFILE}"' EXIT |
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# Create temporary output file |
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TMPFILE=$(mktemp ${OUTPUTFILE}.XXXXXX) |
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if [ -z "${TMPFILE}" ]; then |
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echo "Error creating temporary file, aborting" |
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exit 1 |
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fi |
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# exit on any errors below this line |
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set -e |
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echo "/* DO NOT edit this file, your changes will be overwritten and won't take any effect! */" > "${TMPFILE}" |
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echo "/* Generated from CFLAGS: $@ */" >> "${TMPFILE}" |
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for arg in "$@"; do |
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case ${arg} in |
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-D*) |
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# Strip leading -D |
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d=${arg#-D} |
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if [ -z "${d##*=*}" ]; then |
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# key=value pairs |
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key=${d%%=*} |
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value=${d#*=} |
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echo "#define $key $value" >> "${TMPFILE}" |
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else |
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# simple #define |
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echo "#define $d 1" >> "${TMPFILE}" |
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fi |
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;; |
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-U*) |
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# Strip leading -U |
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d=${arg#-U} |
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echo "#undef $d" >> "${TMPFILE}" |
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;; |
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*) |
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continue |
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;; |
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esac |
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done |
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# Only replace old file if the new file differs. This allows make to check the |
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# date of the config header for dependency calculations. |
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NEWMD5=$(${MD5SUM} ${TMPFILE} | cut -c -32) |
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OLDMD5=$(${MD5SUM} ${OUTPUTFILE} 2>/dev/null | cut -c -32) |
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if [ "${NEWMD5}" != "${OLDMD5}" ]; then |
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if [ "${DEBUG}" -eq 1 ]; then echo "Replacing ${OUTPUTFILE} (${NEWMD5} != ${OLDMD5})"; fi |
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# Set mode according to umask |
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chmod +rw "${TMPFILE}" |
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mv -f "${TMPFILE}" "${OUTPUTFILE}" |
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else |
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if [ "${DEBUG}" -eq 1 ]; then echo "Keeping old ${OUTPUTFILE}"; fi |
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fi |
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# $TMPFILE will be deleted by the EXIT trap above if it still exists when we exit |
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