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bug#44774: 27.1; emacs build fails on M1 Mac

From: Nathan Hjelm
Subject: bug#44774: 27.1; emacs build fails on M1 Mac
Date: Fri, 20 Nov 2020 23:11:36 -0000

This bug report is being generated on a version of emacs built with the

below fix.

emacs 27.1 (and git master) fails to build on any ARM64 Mac. The error


./temacs Killed: 9

This issue is caused by an invalid code signature. ld signs a binary by

default with an ad-hoc signature. This signature is invalidated by the

make-fingerprint program. To restore the binary it is necessary to

re-sign the binary. This can be done by running codesign -s - on the

binary. This will re-sign the binary with an ad-hoc signature. The

following patch does just this but only on ARM64 systems. Legacy Intel

systems do not yet require a code signature to work (though this

wouldn't break them). See the attached patch.

diff --git a/configure.ac b/configure.ac

index 888b415148..6376e5e83e 100644

--- a/configure.ac

+++ b/configure.ac

@@ -5107,6 +5107,11 @@ case $opsys in

     dnl Not DARWIN, because Panther and lower CoreFoundation.h use DARWIN to

     dnl distinguish macOS from pure Darwin.

     AC_DEFINE(DARWIN_OS, [], [Define if the system is Darwin.])

+    case "${canonical}" in

+      arm-* | aarch64-* )

+        AC_CHECK_PROGS(CODESIGN, [codesign], [yes])

+        ;;

+    esac



   gnu-linux | gnu-kfreebsd )

diff --git a/src/Makefile.in b/src/Makefile.in

index c5fb2ea3ab..0874db6489 100644

--- a/src/Makefile.in

+++ b/src/Makefile.in

@@ -336,6 +336,8 @@ DUMPING=@DUMPING@






 # 'make' verbosity.



@@ -653,6 +655,12 @@ temacs$(EXEEXT): $(LIBXMENU) $(ALLOBJS) $(LIBEGNU_ARCHIVE) $(EMACSRES) \


 ifeq ($(HAVE_PDUMPER),yes)

        $(AM_V_at)$(MAKE_PDUMPER_FINGERPRINT) $@.tmp


+  ifneq ($(CODESIGN),)

+## make-fingerprint breaks the code signature. This code signature must

+## be valid for the executable to run on a ARM Mac.

+       $(CODESIGN) -s - $@.tmp

+  endif


        $(AM_V_at)mv $@.tmp $@

        $(MKDIR_P) $(etc)

In GNU Emacs 27.1 (build 1, arm-apple-darwin20.1.0)

 of 2020-11-20 built on Mac-mini.local

System Description:  macOS 11.0.1

Recent messages:

For information about GNU Emacs and the GNU system, type C-h C-a.

normal-splash-screen: Opening directory: Permission denied, /Users/hjelmn/.emacs.d/auto-save-list

Configured using:

 'configure --disable-silent-rules



 --prefix=/opt/homebrew/Cellar/emacs/27.1 --with-gnutls --without-x

 --with-xml2 --without-dbus --with-modules --without-ns


Configured features:



Important settings:

  locale-coding-system: nil

Major mode: Lisp Interaction

Minor modes in effect:

  tooltip-mode: t

  global-eldoc-mode: t

  eldoc-mode: t

  electric-indent-mode: t

  menu-bar-mode: t

  file-name-shadow-mode: t

  global-font-lock-mode: t

  font-lock-mode: t

  auto-composition-mode: t

  auto-encryption-mode: t

  auto-compression-mode: t

  line-number-mode: t

  transient-mark-mode: t

Load-path shadows:

None found.


(shadow regexp-opt sort mail-extr emacsbug message rmc puny dired

dired-loaddefs format-spec rfc822 mml easymenu mml-sec password-cache

epa derived epg epg-config gnus-util rmail tool-bar rmail-loaddefs

text-property-search time-date subr-x seq mm-decode mm-bodies mm-encode

mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs cl-lib

sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils

term/xterm xterm byte-opt gv bytecomp byte-compile cconv disp-table

tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type

tabulated-list replace newcomment text-mode elisp-mode lisp-mode

prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer

select mouse jit-lock font-lock syntax facemenu font-core

term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang

misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms

cp51932 hebrew greek romanian slovak czech european ethiopic indian

cyrillic chinese composite charscript charprop case-table epa-hook

jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs

button faces cus-face macroexp files text-properties overlay sha1 md5

base64 format env code-pages mule custom widget hashtable-print-readable

backquote threads kqueue multi-tty make-network-process emacs)

Memory information:

((conses 16 47079 7064)

 (symbols 48 6013 1)

 (strings 32 15896 1743)

 (string-bytes 1 514215)

 (vectors 16 7411)

 (vector-slots 8 79909 4622)

 (floats 8 22 251)

 (intervals 56 178 1)

 (buffers 1000 12))

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