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62 lines
1.7 KiB
62 lines
1.7 KiB
4 months ago
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#!/bin/sh
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# Copyright 2015 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Generates a header file with a named constant table made up of "name", value
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# entries by including several build target header files and emitting the list
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# of defines. Use of the preprocessor is needed to recursively include all
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# relevant headers.
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set -e
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if [ $# -ne 1 ] && [ $# -ne 2 ]; then
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echo "Usage: $(basename "$0") OUTFILE"
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echo "Usage: $(basename "$0") INFILE OUTFILE"
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exit 1
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fi
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BUILD="${CC} -dD ${SRC:-.}/gen_constants.c -E"
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GEN_DEPS=1
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if [ $# -eq 2 ]; then
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BUILD="cat $1"
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GEN_DEPS=0
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shift
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fi
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OUTFILE="$1"
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if [ ${GEN_DEPS} -eq 1 ]; then
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# Generate a dependency file which helps the build tool to see when it
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# should regenerate ${OUTFILE}.
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${BUILD} -M -MF "${OUTFILE}.d"
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fi
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# sed expression which extracts constants and converts them from:
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# #define AT_FDWCD foo
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# to:
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# #ifdef AT_FDCWD
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# { "AT_FDWCD", AT_FDCWD },
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# endif
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SED_MULTILINE='s@#define ([[:upper:]][[:upper:]0-9_]*).*@#ifdef \1\
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{ "\1", (unsigned long) \1 },\
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#endif // \1@'
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# Passes the previous list of #includes to the C preprocessor and prints out
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# all #defines whose name is all-caps. Excludes a few symbols that are known
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# macro functions that don't evaluate to a constant.
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cat <<-EOF > "${OUTFILE}"
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/* GENERATED BY MAKEFILE */
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#include "gen_constants-inl.h"
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#include "libconstants.h"
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const struct constant_entry constant_table[] = {
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$(${BUILD} | \
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grep -E '^#define [[:upper:]][[:upper:]0-9_]*[[:space:]]+[[:alnum:]_]' | \
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grep -Ev '(SIGRTMAX|SIGRTMIN|SIG_|NULL)' | \
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sort -u | \
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sed -Ee "${SED_MULTILINE}")
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{ NULL, 0 },
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};
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EOF
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