From 749468ac63042820bc3da85ece5bed64b0c15d62 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at>
Date: Mon, 28 Mar 2016 19:44:19 -0700
Subject: [PATCH] automake: port better to future gzip
* lib/am/distdir.am (dist-gzip, dist-shar, distcheck):
Port better to future versions of gzip, which are planned to
deprecate the GZIP environment variable (Bug#20132).
---
lib/am/distdir.am | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/lib/am/distdir.am b/lib/am/distdir.am
index d4dd8cc..87c6730 100644
--- a/lib/am/distdir.am
+++ b/lib/am/distdir.am
@@ -309,6 +309,16 @@ endif %?TOPDIR_P%
## We order DIST_TARGETS by expected duration of the compressors,
## slowest first, for better parallelism in "make dist". Do not
## reorder DIST_ARCHIVES, users may expect gzip to be first.
+##
+## Traditionally, gzip prepended the contents of the GZIP environment
+## variable to its arguments, and the commands below formerly used
+## this by invoking 'GZIP=$(GZIP_ENV) gzip'. The GZIP environment
+## variable is now considered to be obsolescent, so the commands below
+## now use 'eval GZIP= gzip $(GZIP_ENV)' instead; this should work
+## with both older and newer gzip implementations. The 'eval' is to
+## support makefile assignments like 'GZIP_ENV = "-9 -n"' that quote
+## the GZIP_ENV right-hand side because that was needed with the
+## former invocation pattern.
if %?TOPDIR_P%
@@ -316,7 +326,7 @@ if %?TOPDIR_P%
GZIP_ENV = --best
.PHONY: dist-gzip
dist-gzip: distdir
- tardir=$(distdir) && $(am__tar) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).tar.gz
+ tardir=$(distdir) && $(am__tar) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).tar.gz
$(am__post_remove_distdir)
?BZIP2?DIST_ARCHIVES += $(distdir).tar.bz2
@@ -352,7 +362,7 @@ dist-shar: distdir
@echo WARNING: "Support for shar distribution archives is" \
"deprecated." >&2
@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
- shar $(distdir) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).shar.gz
+ shar $(distdir) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).shar.gz
$(am__post_remove_distdir)
?ZIP?DIST_ARCHIVES += $(distdir).zip
@@ -412,7 +422,7 @@ endif %?SUBDIRS%
distcheck: dist
case '$(DIST_ARCHIVES)' in \
*.tar.gz*) \
- GZIP=$(GZIP_ENV) gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
+ eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).tar.gz | $(am__untar) ;;\
*.tar.bz2*) \
bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
*.tar.lz*) \
@@ -422,7 +432,7 @@ distcheck: dist
*.tar.Z*) \
uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
*.shar.gz*) \
- GZIP=$(GZIP_ENV) gzip -dc $(distdir).shar.gz | unshar ;;\
+ eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).shar.gz | unshar ;;\
*.zip*) \
unzip $(distdir).zip ;;\
esac
--
2.7.4