GNU bug report logs - #23764
[bug-gnu-emacs] emacs-25.0.95 fails to build on DragonFlyBSD, and an easy repair

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: "Nelson H. F. Beebe" <beebe <at> math.utah.edu>
Subject: bug#23764: closed (Re: bug#23764: [bug-gnu-emacs] emacs-25.0.95
 fails to build on DragonFlyBSD, and an easy repair)
Date: Tue, 14 Jun 2016 17:41:02 +0000

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Your bug report

#23764: [bug-gnu-emacs] emacs-25.0.95 fails to build on DragonFlyBSD, and an easy repair

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 23764 <at> debbugs.gnu.org.

-- 
23764: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23764
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Glenn Morris <rgm <at> gnu.org>
To: 23764-done <at> debbugs.gnu.org
Subject: Re: bug#23764: [bug-gnu-emacs] emacs-25.0.95 fails to build on
 DragonFlyBSD, and an easy repair
Date: Tue, 14 Jun 2016 13:40:49 -0400

Version: 25.0.96

Thanks; fixed.
I see DragonFly BSD has known about this for months, eg

https://github.com/DragonFlyBSD/DPorts/blob/master/editors/emacs-devel/dragonfly/patch-src_alloc.c

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From: "Nelson H. F. Beebe" <beebe <at> math.utah.edu>
To: bug-gnu-emacs <at> gnu.org
Cc: beebe <at> math.utah.edu
Subject: [bug-gnu-emacs] emacs-25.0.95 fails to build on DragonFlyBSD, and an
 easy repair
Date: Mon, 13 Jun 2016 14:10:07 -0600

emacs-25.0.95 fails to build on DragonFlyBSD 3.8, 3.9, 4.0, 4.2, 4.4,
and 4.6, independent of the compiler (various gcc or clang versions)
used.

On each system, src/alloc.c fails to compile:

	CC       alloc.o
	alloc.c:474:32: error: macro "ALIGN" passed 2 arguments, but takes just 1
	 ALIGN (void *ptr, int alignment)
					^
	alloc.c:475:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '' token
	 {
	 ^
	alloc.c: In function 'pure_alloc':
	alloc.c:5171:66: error: macro "ALIGN" passed 2 arguments, but takes just 1
	       result = ALIGN (purebeg + pure_bytes_used_lisp, GCALIGNMENT);
									  ^
	alloc.c:5171:16: error: 'ALIGN' undeclared (first use in this function)
	       result = ALIGN (purebeg + pure_bytes_used_lisp, GCALIGNMENT);
			^
	alloc.c:5171:16: note: each undeclared identifier is reported only once for each function it appears in
	Makefile:378: recipe for target 'alloc.o' failed
	gmake[1]: [alloc.o] Error 1 (ignored)

The conflict with the all-to-generic macro name ALIGN() appears to
come from these DragonFlyBSD definitions:

	% find /usr/include -type f | xargs grep '[^_A-Z]_ALIGN[^_A-Z]'
	/usr/include/cpu/param.h:#define _ALIGN(p)      (((unsigned long)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
	/usr/include/cpu/param.h:#define ALIGN(p)       _ALIGN(p)

whereas alloc.c has

	static void *
	ALIGN (void *ptr, int alignment)
	{
	  return (void *) ROUNDUP ((uintptr_t) ptr, alignment);
	}

As an experiment, I made these patches to alloc.c on DragonFlyBSD 4.6:

	% diff alloc.c.org alloc.c
	474c474
	< ALIGN (void *ptr, int alignment)
	---
	> EMACS_ALIGN (void *ptr, int alignment)
	1245c1245
	<       abase = ALIGN (base, BLOCK_ALIGN);
	---
	>       abase = EMACS_ALIGN (base, BLOCK_ALIGN);
	5171c5171
	<       result = ALIGN (purebeg + pure_bytes_used_lisp, GCALIGNMENT);
	---
	>       result = EMACS_ALIGN (purebeg + pure_bytes_used_lisp, GCALIGNMENT);

That solved the build problem on DragonFlyBSD 4.6, and I've installed
the new emacs on that system.  The same fix repaired all of the five
other versions of that O/S in my lab.

Another, and simpler solution, would be to insert

	#undef ALIGN

before the first use of ALIGN() in alloc.c.

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe <at> math.utah.edu  -
- 155 S 1400 E RM 233                       beebe <at> acm.org  beebe <at> computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
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