Simplify test dependency generation

Generate default dependencies by using GNU extensions to ‘make’
rather than via a hacky auxiliary program and script.
* .gitignore: Remove test/make-test-deps.mk.
* test/Makefile.in (ELFILES, LOGFILES, TESTS):
Use :=, not =, to avoid multiple redundant invocations of ‘find’.
(test_template): Infer dependency directly instead of via
make-test-deps.mk.
(check-doit): Prepend ‘@’ to avoid excessively long ‘make’ output.
(clean): No need to clean make-test-deps.mk.
(make-test-deps.mk): Remove rule.
* test/make-test-deps.emacs-lisp: Remove.

3 files changed, 11 insertions, 119 deletions

diff --git a/.gitignore b/.gitignore
index ce1866d616b..aa9e1ff709e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -141,7 +141,6 @@ src/*.map
 
 # Tests.
 test/indent/*.new
-test/make-test-deps.mk
 test/manual/biditest.txt
 test/manual/etags/srclist
 test/manual/etags/regexfile
diff --git a/test/Makefile.in b/test/Makefile.in
index c0056b6f44d..d218b640057 100644
--- a/test/Makefile.in
+++ b/test/Makefile.in
@@ -124,12 +124,12 @@ endif
         $(emacs) -l ert -l $$loadfile \
           --eval "(ert-run-tests-batch-and-exit ${SELECTOR_ACTUAL})" ${WRITE_LOG}
 
-ELFILES = $(shell find ${srcdir} -path "${srcdir}/manual" -prune -o \
-                -path "*resources" -prune -o -name "*el" -print)
+ELFILES := $(shell find ${srcdir} -path "${srcdir}/manual" -prune -o \
+                -name "*resources" -prune -o -name "*.el" -print)
 ## .log files may be in a different directory for out of source builds
-LOGFILES = $(patsubst %.el,%.log, \
+LOGFILES := $(patsubst %.el,%.log, \
                 $(patsubst $(srcdir)%,.%,$(ELFILES)))
-TESTS = $(subst ${srcdir}/,,$(LOGFILES:.log=))
+TESTS := $(subst ${srcdir}/,,$(LOGFILES:.log=))
 
 ## If we have to interrupt a hanging test, preserve the log so we can
 ## see what the problem was.
@@ -141,6 +141,11 @@ TESTS = $(subst ${srcdir}/,,$(LOGFILES:.log=))
 ## Define an alias both with and without the directory name for ease
 ## of use.
 define test_template
+  ifeq (,$(patsubst $(srcdir)/src/%,,$(1)))
+    $(1): $(srcdir)/../src/$(1:.log=.c)
+  else
+    $(1): $(srcdir)/../lisp/$(1:.log=.el)
+  endif
 $(1):
         @test ! -f ./$(1).log || mv ./$(1).log ./$(1).log~
         @${MAKE} ./$(1).log WRITE_LOG=
@@ -157,11 +162,6 @@ $(foreach test,${TESTS},$(eval $(call test_template,${test})))
 check-no-automated-subdir:
         test ! -d $(srcdir)/automated
 
-## Include dependencies between test files and the files they test.
-## We could do this without the file and eval directly, but then we
-## would have to run Emacs for every make invocation, and it might not
-## be available during clean.
--include make-test-deps.mk
 ## Rerun all default tests.
 check: mostlyclean check-no-automated-subdir
         @${MAKE} check-doit SELECTOR="${SELECTOR_ACTUAL}"
@@ -175,7 +175,7 @@ check-expensive: mostlyclean check-no-automated-subdir
 ## logfile is out-of-date with either the test file, or the source
 ## files that the tests depend on. The source file dependencies are
 ## determined by a heuristic and does not identify the full dependency
-## graph. See make-test-deps.emacs-lisp for details.
+## graph. See test_template for details.
 .PHONY: check-maybe
 check-maybe: check-no-automated-subdir
         @${MAKE} check-doit SELECTOR="${SELECTOR_ACTUAL}"
@@ -183,7 +183,7 @@ check-maybe: check-no-automated-subdir
 ## Run the tests.
 .PHONY: check-doit
 check-doit: ${LOGFILES}
-        $(emacs) -l ert -f ert-summarize-tests-batch-and-exit $^
+        @$(emacs) -l ert -f ert-summarize-tests-batch-and-exit $^
 
 .PHONY: mostlyclean clean bootstrap-clean distclean maintainer-clean
 
@@ -193,7 +193,6 @@ mostlyclean:
 
 clean:
         find . '(' -name '*.log' -o -name '*.log~' ')' $(FIND_DELETE)
-        rm -f make-test-deps.mk
 
 bootstrap-clean: clean
         find $(srcdir) -name '*.elc' $(FIND_DELETE)
@@ -202,11 +201,3 @@ distclean: clean
         rm -f Makefile
 
 maintainer-clean: distclean bootstrap-clean
-
-make-test-deps.mk: $(ELFILES) make-test-deps.emacs-lisp
-        $(EMACS) --batch -l $(srcdir)/make-test-deps.emacs-lisp \
-        --eval "(make-test-deps \"$(srcdir)\")" \
-        2> $@.tmp
-        # Hack to elide any CANNOT_DUMP=yes chatter.
-        sed '/\.log: /!d' $@.tmp >$@
-        rm -f $@.tmp
diff --git a/test/make-test-deps.emacs-lisp b/test/make-test-deps.emacs-lisp
deleted file mode 100644
index 609e9276186..00000000000
--- a/test/make-test-deps.emacs-lisp
+++ /dev/null
@@ -1,98 +0,0 @@
-;; -*- emacs-lisp -*-
-
-;; Copyright (C) 2015-2017 Free Software Foundation, Inc.
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs is free software: you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation, either version 3 of the License, or
-;; (at your option) any later version.
-
-;; GNU Emacs is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;; This file generates dependencies between test files and the files
-;; that they test.
-
-;; It has an .emacs-lisp extension because it makes the Makefile easier!
-
-(require 'seq)
-
-(defun make-test-deps (src-dir)
-  (let ((src-dir (file-truename src-dir)))
-    (message
-     "%s"
-     (concat
-      (make-test-deps-lisp src-dir)
-      (make-test-deps-src src-dir)))))
-
-(defun make-test-deps-lisp (src-dir)
-  (mapconcat
-   (lambda (file-without-suffix)
-     (format "./%s-tests.log: %s/../%s.el\n"
-             file-without-suffix
-             src-dir
-             file-without-suffix))
-   (make-test-test-files src-dir "lisp") ""))
-
-(defun make-test-deps-src (src-dir)
-  (mapconcat
-   (lambda (file-without-suffix)
-     (format "./%s-tests.log: %s/../%s.c\n"
-             file-without-suffix
-             src-dir
-             file-without-suffix))
-   (make-test-test-files src-dir "src") ""))
-
-(defun make-test-test-files (src-dir sub-src-dir)
-  (make-test-munge-files
-   src-dir
-   (directory-files-recursively
-    (concat src-dir "/"  sub-src-dir)
-    ".*-tests.el$")))
-
-(defun make-test-munge-files (src-dir files)
-  (make-test-sans-suffix
-   (make-test-de-stem
-    src-dir
-    (make-test-no-legacy
-     (make-test-no-test-dir
-      (make-test-no-resources
-       files))))))
-
-(defun make-test-sans-suffix (files)
-  (mapcar
-   (lambda (file)
-     (substring file 0 -9))
-   files))
-
-(defun make-test-de-stem (stem files)
-  (mapcar
-   (lambda (file)
-     (substring
-      file
-      (+ 1 (length stem))))
-   files))
-
-(defun make-test-no-legacy (list)
-  (make-test-remove list "legacy/"))
-
-(defun make-test-no-resources (list)
-  (make-test-remove list "-resources/"))
-
-(defun make-test-no-test-dir (list)
-  (make-test-remove list "-tests/"))
-
-(defun make-test-remove (list match)
-  (seq-remove
-   (lambda (file)
-     (string-match-p match file))
-   list))