Makefile: Use GNU tar if available (#1957)

Makefile

@@ -24,6 +24,13 @@ docker_%:
 ##
 PHPCS := $(BIN)/phpcs
 
+# Use GNU Tar where available
+ifneq (, $(shell which gtar))
+TAR := gtar
+else
+TAR := tar
+endif
+
 code_sniffer:
  @$(PHPCS)
 
@@ -115,9 +122,9 @@ build_frontend: frontend_dependencies
 ### generate a release tarball and include 3rd-party dependencies and translations
 release_tar: composer_dependencies htmldoc translate build_frontend
  git archive --prefix=$(ARCHIVE_PREFIX) -o $(ARCHIVE_VERSION).tar HEAD
- tar rvf $(ARCHIVE_VERSION).tar --transform "s|^vendor|$(ARCHIVE_PREFIX)vendor|" vendor/
- tar rvf $(ARCHIVE_VERSION).tar --transform "s|^doc/html|$(ARCHIVE_PREFIX)doc/html|" doc/html/
- tar rvf $(ARCHIVE_VERSION).tar --transform "s|^tpl|$(ARCHIVE_PREFIX)tpl|" tpl/
+ $(TAR) rvf $(ARCHIVE_VERSION).tar --transform "s|^vendor|$(ARCHIVE_PREFIX)vendor|" vendor/
+ $(TAR) rvf $(ARCHIVE_VERSION).tar --transform "s|^doc/html|$(ARCHIVE_PREFIX)doc/html|" doc/html/
+ $(TAR) rvf $(ARCHIVE_VERSION).tar --transform "s|^tpl|$(ARCHIVE_PREFIX)tpl|" tpl/
  gzip $(ARCHIVE_VERSION).tar
 
 ### generate a release zip and include 3rd-party dependencies and translations

doc/md/dev/Release-Shaarli.md

@@ -14,6 +14,7 @@ This guide assumes that you have:
  - create a new release
 - [Composer](https://getcomposer.org/) needs to be installed
 - The [venv](https://docs.python.org/3/library/venv.html) Python 3 module needs to be installed for HTML documentation generation.
+- Make sure you have GNU `tar` installed (not BSD `tar`). On macOS, you can install it with `brew install gnu-tar`.
 
 ## Release notes and `CHANGELOG.md`