Merge branch 'ab/perl-makefile-cleanup'

Build procedure clean-up.

* ab/perl-makefile-cleanup:
  Makefile: make PERL_DEFINES recursively expanded
  perl: use mock i18n functions under NO_GETTEXT=Y
  Makefile: regenerate *.pm on NO_PERL_CPAN_FALLBACKS change
  Makefile: regenerate perl/build/* if GIT-PERL-DEFINES changes
  Makefile: don't re-define PERL_DEFINES

Author: gitster

Makefile

@@ -1987,6 +1987,7 @@ ETC_GITCONFIG_SQ = $(subst ','\'',$(ETC_GITCONFIG))
 ETC_GITATTRIBUTES_SQ = $(subst ','\'',$(ETC_GITATTRIBUTES))
 
 DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
+NO_GETTEXT_SQ = $(subst ','\'',$(NO_GETTEXT))
 bindir_SQ = $(subst ','\'',$(bindir))
 bindir_relative_SQ = $(subst ','\'',$(bindir_relative))
 mandir_SQ = $(subst ','\'',$(mandir))
@@ -2271,10 +2272,13 @@ perl_localedir_SQ = $(localedir_SQ)
 
 ifndef NO_PERL
 PERL_HEADER_TEMPLATE = perl/header_templates/fixed_prefix.template.pl
-PERL_DEFINES = $(PERL_PATH_SQ):$(PERLLIB_EXTRA_SQ):$(perllibdir_SQ)
-
-PERL_DEFINES := $(PERL_PATH_SQ) $(PERLLIB_EXTRA_SQ) $(perllibdir_SQ)
+PERL_DEFINES =
+PERL_DEFINES += $(PERL_PATH_SQ)
+PERL_DEFINES += $(PERLLIB_EXTRA_SQ)
+PERL_DEFINES += $(perllibdir_SQ)
 PERL_DEFINES += $(RUNTIME_PREFIX)
+PERL_DEFINES += $(NO_PERL_CPAN_FALLBACKS)
+PERL_DEFINES += $(NO_GETTEXT)
 
 # Support Perl runtime prefix. In this mode, a different header is installed
 # into Perl scripts.
@@ -2676,9 +2680,10 @@ endif
 NO_PERL_CPAN_FALLBACKS_SQ = $(subst ','\'',$(NO_PERL_CPAN_FALLBACKS))
 endif
 
-perl/build/lib/%.pm: perl/%.pm
+perl/build/lib/%.pm: perl/%.pm GIT-PERL-DEFINES
 	$(QUIET_GEN)mkdir -p $(dir $@) && \
 	sed -e 's|@@LOCALEDIR@@|$(perl_localedir_SQ)|g' \
+	    -e 's|@@NO_GETTEXT@@|$(NO_GETTEXT_SQ)|g' \
 	    -e 's|@@NO_PERL_CPAN_FALLBACKS@@|$(NO_PERL_CPAN_FALLBACKS_SQ)|g' \
 	< $< > $@
 

perl/Git/I18N.pm

@@ -16,9 +16,19 @@ BEGIN {
 our @EXPORT = qw(__ __n N__);
 our @EXPORT_OK = @EXPORT;
 
+# See Git::LoadCPAN's NO_PERL_CPAN_FALLBACKS_STR for a description of
+# this "'@@' [...] '@@'" pattern.
+use constant NO_GETTEXT_STR => '@@' . 'NO_GETTEXT' . '@@';
+use constant NO_GETTEXT => (
+	q[@@NO_GETTEXT@@] ne ''
+	and
+	q[@@NO_GETTEXT@@] ne NO_GETTEXT_STR
+);
+
 sub __bootstrap_locale_messages {
 	our $TEXTDOMAIN = 'git';
 	our $TEXTDOMAINDIR ||= $ENV{GIT_TEXTDOMAINDIR} || '@@LOCALEDIR@@';
+	die "NO_GETTEXT=" . NO_GETTEXT_STR if NO_GETTEXT;
 
 	require POSIX;
 	POSIX->import(qw(setlocale));