Re: CHECK_STRUCTS/dmpstruct.h mechanism is broken.

[Paul Eggert <eggert@cs.ucla.edu>]

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Richard Stallman wrote:
> The code only has to be written once; then people will copy it into
> other programs that use the same general approach with GNU Make.

After writing a patch along these lines, I somewhat doubt whether it will be 
worth the trouble. But if it causes trouble I suppose we can always go back to 
what Emacs 25 and 26 do. So I installed the patch into master; see attached.

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From 6fa8d3c894062e7d3bde2d1ed35b40f2272e59f5 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 22 Apr 2019 20:44:11 -0700
Subject: [PATCH] =?UTF-8?q?Let=20plain=20=E2=80=98make=E2=80=99=20work=20e?=
 =?UTF-8?q?ven=20not=20GNU=20Make?=
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Content-Transfer-Encoding: 8bit

* Makefile.in (top_distclean): Clean makefile as well as Makefile.
* configure.ac: If not using plain ‘make’, create a makefile
so that plain ‘make’ simply calls $(MAKE).
---
 Makefile.in  |  2 +-
 configure.ac | 10 +++++++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/Makefile.in b/Makefile.in
index 53703638c4..6b99d24da4 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -869,7 +869,7 @@ top_bootclean=
 top_distclean=\
 	${top_bootclean}; \
 	rm -f config.status config.log~ \
-	  Makefile lib/gnulib.mk ${SUBDIR_MAKEFILES}
+	  Makefile makefile lib/gnulib.mk ${SUBDIR_MAKEFILES}
 
 distclean_dirs = $(clean_dirs) leim lisp
 
diff --git a/configure.ac b/configure.ac
index 0ecb8c40e6..8b363c7fca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5814,4 +5814,12 @@ m4_define
   esac
 fi
 
-test "$MAKE" = make || AC_MSG_NOTICE([Now you can run '$MAKE'.])
+# Let plain 'make' work.
+test "$MAKE" = make || test -f makefile || cat >makefile <<EOF
+.POSIX:
+MAKE = $MAKE
+all:
+	\$(MAKE) -f Makefile \$?
+.DEFAULT:
+	\$(MAKE) -f Makefile \$<
+EOF
-- 
2.17.1