From 50e8259639936c867c486917aba8d9f748a35d2c Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 24 Feb 2023 07:38:19 -0500
Subject: build: Use AC_CONFIG_SUBDIRS()

But explain why Automake's SUBDIRS can't be used.

Also, exclude instructions to generate files from generated files.
---
(limited to '3rdparty')

diff --git a/3rdparty/local.mk b/3rdparty/local.mk
index 2fcd50b..40a8490 100644
--- a/3rdparty/local.mk
+++ b/3rdparty/local.mk
@@ -1,8 +1,19 @@
 if EMBEDDED_XCF2PNG
+## Yes, SUBDIRS should be used instead, except that these lines are still needed
+## in case boukengine's default verbosity differs from that of xcftools:
 VV   = $(VV_$(V))
 VV_  = $(AM_DEFAULT_VERBOSITY)
 VV_1 = 1
 VV_0 = 0
+## Plus this is needed:
+##     AM_MAKEFLAGS = V=$(VV)
+## But this is still not enough, for two reasons:
+##  1. xcftools needs a "distdir" target [1] in its makefile, which would mean
+##     copying the source tree, which xcftools currently avoids with a symbolic
+##     link and manifest file, and
+##  2. Installing boukengine also installs xcftools, which is unnecessary.
+## [1]:
+##    https://gnu.org/s/automake/manual/html_node/Third_002dParty-Makefiles.html
 $(XCF2PNG):
 	$(AM_V_at)(cd %reldir%/xcftools/ && $(MAKE) V=$(VV))
 clean-local:
--
cgit v0.9.1