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[Emacs-diffs] master 88e0125: Avoid unnecessary regeneration of the enti
From: |
Eli Zaretskii |
Subject: |
[Emacs-diffs] master 88e0125: Avoid unnecessary regeneration of the entire loaddefs.el |
Date: |
Thu, 13 Apr 2017 03:04:20 -0400 (EDT) |
branch: master
commit 88e012511ac6bfd7eb31b14d792ab0005e3693a8
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>
Avoid unnecessary regeneration of the entire loaddefs.el
* lisp/Makefile.in (autoloads .PHONY): Add commentary explaining
why $(lisp)/loaddefs.el is a dependency of '.PHONY'.
($(lisp)/loaddefs.el): Copy an existing loaddefs.el to
loaddefs.tmp before running 'batch-update-autoloads' on it, to
avoid slow regeneration of the full contents. (Bug#26459)
Use 'move-if-change' instead of 'mv', to avoid producing a new
Emacs binary when not necessary.
---
lisp/Makefile.in | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/lisp/Makefile.in b/lisp/Makefile.in
index 334f2a4..ec9ea16 100644
--- a/lisp/Makefile.in
+++ b/lisp/Makefile.in
@@ -182,15 +182,25 @@ $(lisp)/finder-inf.el:
#
# Write to a temporary file in case we're doing a parallel build and a
# CANNOT_DUMP-mode Emacs needs to read loaddefs at startup.
+#
+# We make $(lisp)/loaddefs.el a dependency of .PHONY to cause Make to
+# ignore its time stamp. That's because the real dependencies of
+# loaddefs.el aren't known to Make, they are implemented in
+# batch-update-autoloads, which only updates the autoloads whose
+# sources have changed. We start by copying an existing loaddefs.el
+# to loaddefs.tmp to avoid regenerating the entire file anew, which is
+# slow; starting from an almost-correct content will enable the "only
+# update where necessary" feature of batch-update-autoloads.
autoloads .PHONY: $(lisp)/loaddefs.el
$(lisp)/loaddefs.el: $(LOADDEFS)
@echo Directories for loaddefs: ${SUBDIRS_ALMOST}
+ @if test -f $@ ; then cp $@ $(lisp)/loaddefs.tmp ; fi
$(AM_V_GEN)$(emacs) -l autoload \
--eval '(setq autoload-ensure-writable t)' \
--eval '(setq autoload-builtin-package-versions t)' \
--eval '(setq generated-autoload-file (expand-file-name
(unmsys--file-name "$(lisp)/loaddefs.tmp")))' \
-f batch-update-autoloads ${SUBDIRS_ALMOST}
- mv -f $(lisp)/loaddefs.tmp $@
+ $(top_srcdir)/build-aux/move-if-change $(lisp)/loaddefs.tmp $@
# autoloads only runs when loaddefs.el is nonexistent, although it
# generates a number of different files. Provide a force option to enable
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