Bug 1294803 - Move MOZ_SYSTEM_FFI to moz.configure in preparation for moving libffi to our build system. r=glandium

This patch introduces a small change in behavior: we now unconditionally
require libffi > 3.0.9 when using system ffi, rather than accepting 3.0.9
when using GCC, as 3.0.10 was released 5 years ago, and should be widely
available.


MozReview-Commit-ID: DtSDPoZSPcx

build/autoconf/ffi.m4

@@ -2,26 +2,6 @@ dnl This Source Code Form is subject to the terms of the Mozilla Public
 dnl License, v. 2.0. If a copy of the MPL was not distributed with this
 dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-AC_DEFUN([MOZ_CONFIG_FFI], [
-
-MOZ_ARG_ENABLE_BOOL(system-ffi,
-[  --enable-system-ffi       Use system libffi (located with pkgconfig)],
-    MOZ_SYSTEM_FFI=1 )
-
-if test -n "$MOZ_SYSTEM_FFI"; then
-    # Vanilla libffi 3.0.9 needs a few patches from upcoming version 3.0.10
-    # for non-GCC compilers.
-    if test -z "$GNU_CC"; then
-        PKG_CHECK_MODULES(MOZ_FFI, libffi > 3.0.9)
-    else
-        PKG_CHECK_MODULES(MOZ_FFI, libffi >= 3.0.9)
-    fi
-fi
-
-AC_SUBST(MOZ_SYSTEM_FFI)
-
-])
-
 AC_DEFUN([MOZ_SUBCONFIGURE_FFI], [
 if test "$MOZ_BUILD_APP" != js -o -n "$JS_STANDALONE"; then
 

build/moz.configure/ffi.configure

@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+js_option('--with-system-ffi',
+          help='Use system libffi (located with pkgconfig)')
+
+use_system_ffi = depends_if('--with-system-ffi')(lambda _: True)
+
+system_ffi = pkg_check_modules('MOZ_FFI', 'libffi > 3.0.9', use_system_ffi)
+
+set_config('MOZ_SYSTEM_FFI', system_ffi)
+add_old_configure_assignment('MOZ_SYSTEM_FFI', system_ffi)

build/moz.configure/old.configure

@@ -234,7 +234,6 @@ def old_configure_options(*options):
     '--enable-synth-pico',
     '--enable-system-cairo',
     '--enable-system-extension-dirs',
-    '--enable-system-ffi',
     '--enable-system-pixman',
     '--enable-system-sqlite',
     '--enable-tasktracer',

js/src/old-configure.in

@@ -1538,11 +1538,6 @@ if test -n "$ZLIB_IN_MOZGLUE"; then
 fi
 AC_SUBST(ZLIB_IN_MOZGLUE)
 
-dnl ========================================================
-dnl system libffi Support
-dnl ========================================================
-MOZ_CONFIG_FFI()
-
 dnl ========================================================
 dnl =
 dnl = Application

moz.configure

@@ -101,6 +101,8 @@ include_when('build/moz.configure/headers.configure',
              when='--enable-compile-environment')
 include_when('build/moz.configure/warnings.configure',
              when='--enable-compile-environment')
+include_when('build/moz.configure/ffi.configure',
+             when='--enable-compile-environment')
 
 @dependable
 @imports(_from='mozbuild.backend', _import='backends')

old-configure.in

@@ -2297,11 +2297,6 @@ fi # SKIP_LIBRARY_CHECKS
 
 AC_SUBST(MOZ_PNG_ARM_NEON)
 
-dnl ========================================================
-dnl system libffi Support
-dnl ========================================================
-MOZ_CONFIG_FFI()
-
 dnl ========================================================
 dnl =
 dnl = Application