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build: Add variable printing target to Makefiles

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I kept finding myself needing these to debug our build system, since
they are innocuous and are very helpful they probably belong in the
codebase.

Source: John Graham-Cumming
https://www.cmcrossroads.com/article/printing-value-makefile-variable
This commit is contained in:
Carl Dong
2019-10-09 11:12:55 -04:00
parent 1c11e53bb6
commit 181989f6c9
2 changed files with 8 additions and 0 deletions
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4
Makefile.am
View File

@@ -2,6 +2,10 @@
# Distributed under the MIT software license, see the accompanying # Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php. # file COPYING or http://www.opensource.org/licenses/mit-license.php.
# Pattern rule to print variables, e.g. make print-top_srcdir
print-%:
@echo $* = $($*)
ACLOCAL_AMFLAGS = -I build-aux/m4 ACLOCAL_AMFLAGS = -I build-aux/m4
SUBDIRS = src SUBDIRS = src
if ENABLE_MAN if ENABLE_MAN

4
depends/Makefile
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@@ -1,5 +1,9 @@
.NOTPARALLEL : .NOTPARALLEL :
# Pattern rule to print variables, e.g. make print-top_srcdir
print-%:
@echo $* = $($*)
SOURCES_PATH ?= $(BASEDIR)/sources SOURCES_PATH ?= $(BASEDIR)/sources
WORK_PATH = $(BASEDIR)/work WORK_PATH = $(BASEDIR)/work
BASE_CACHE ?= $(BASEDIR)/built BASE_CACHE ?= $(BASEDIR)/built