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68 lines
3.1 KiB
68 lines
3.1 KiB
#!/bin/sh
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#
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# This file is part of dobuild.
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# Copyright (c) 2019 Contributors as noted in the AUTHORS file.
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#
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# SPDX-License-Identifier: MPL-2.0
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set -e
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# Derived based on https://stackoverflow.com/questions/4219255/how-do-you-get-the-list-of-targets-in-a-makefile
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#
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# Note: This relies on -p printing the database nonetheless, which is the case as of GNU make 3.82.
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# Sadly, GNU make offers no direct option to just print the database.
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#
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# Invokes make in order to print the database derived from a makefile:
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# -p prints the database
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# -Rr suppresses inclusion of built-in rules and variables
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# -q only tests the up-to-date-status of a target (without remaking anything), but that by itself doesn't
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# prevent execution of recipe commands in all cases
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# "$@" list of separate commandline parameters (additional make parameters)
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# : is a deliberately invalid target that is meant to ensure that no commands are executed;
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# 2>&1 1>&3
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# redirect stderr to stdout and stdout to fd 3 to allow filtering unwanted error message
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# grep -v '.*\s\+No rule to make target\s\+.*:.*' 1>&2
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# suppresses the resulting error message - "make: *** No rule to make target ':'. Stop." and redirect
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# other output to stderr
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# 3>&1 redirect fd 3 back to stdout
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print_make_db() {
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{ "$MAKE" -pRrq "$@" : 2>&1 1>&3 | grep -v '.*\s\+No rule to make target\s\+.*:.*' 1>&2; } 3>&1
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}
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export LANG=C
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export LC_ALL=C
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MAKE="${MAKE:-make}"
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print_make_db "$@" \
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| awk -v RS= -F: '/^# File/,/^# Finished Make database/ {if ($1 !~ "^[#.]") {print $1}}' \
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| sort \
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| grep -v -e '^[^[:alnum:]]' -e '[%]$'
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# Pipe-chain explanation:
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# awk -v RS= -F: '/^# File/,/^# Finished Make database/ {if ($1 !~ "^[#.]") {print $1}}'
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# v RS= this is an awk idiom that breaks the input into blocks of contiguous non-empty lines.
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# -F: input field speparator
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# /^# File/,/^# Finished Make database/
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# matches the range of lines in the output that contains all targets (true as of GNU make 3.82) - by limiting
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# parsing to this range, there is no need to deal with false positives from other output sections.
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# if ($$1 !~ "^[#.]")
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# selectively ignores blocks:
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# # ... ignores non-targets, whose blocks start with # Not a target:
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# . ... ignores special targets
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# all other blocks should each start with a line containing only the name of an explicitly defined target
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# followed by :
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# sort
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# sorts the resulting list of targets, which is the best option, since not sorting doesn't produce a helpful
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# ordering in that the order in which the targets appear in the makefile is not preserved.
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# grep -v -e '^[^[:alnum:]]' -e '[%]$$' removes unwanted targets from the output:
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# -v revert machtes
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# -e '^[^[:alnum:]]'
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# ... hidden targets, which - by convention - are targets that start neither with a letter nor a digit.
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# -e '[%]$$'
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# ... targets ending with % (pattern targets)
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