Failed loading xdebug did found mach-o, but wrong architecture for php7

Question

Whether I install via homebrew:

brew install homebrew/php/php70-xdebug

or compile from source located at http://xdebug.org using either just ./configure or the following:

./configure --enable-xdebug CC="gcc -arch i386" CXX="g++ -arch i386"
make

I still receive the following when running php7 that is bundled with Acquia DevDesktop:

Failed loading /Applications/DevDesktop/php7_0/ext/xdebug.so:  dlopen(/Applications/DevDesktop/php7_0/ext/xdebug.so, 9): no suitable image found.  Did find:
    /Applications/DevDesktop/php7_0/ext/xdebug.so: mach-o, but wrong architecture

Things I have confirmed:

• I am copying the xdebug.so into the proper directory either from /usr/local/Cellar/php70-xdebug/2.4.0 (in the case of the homebrew install)
• or from the newly compiled one from xdebug-2.4.0/module
• which php returns /Applications/DevDesktop/php7_0/bin/php
• php -i shows the correct .ini file (/Applications/DevDesktop/php7_0/bin/php.ini) and no others
• opcache.so is turned off
• zend_extension="/Applications/DevDesktop/php7_0/ext/xdebug.so" is in the php.ini

The full message php --version returns is:

$ php --version
Failed loading /Applications/DevDesktop/php7_0/ext/xdebug.so:  dlopen(/Applications/DevDesktop/php7_0/ext/xdebug.so, 9): no suitable image found.  Did find:
    /Applications/DevDesktop/php7_0/ext/xdebug.so: mach-o, but wrong architecture
PHP 7.0.4 (cli) (built: Mar 18 2016 02:12:27) ( ZTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies

The OS is a brand-new install of Mac OS 10.11.5 on a MacBook Air.

Does anyone know why is it complaining about the wrong architecture?

Answer 1

This is what worked for me for DevDesktop:

1. Download and extract the xdebug source code (I used xdebug-2.5.5).
2. $ cd xdebug-2.5.5
3. $ /Applications/DevDesktop/php7_0/bin/phpize

and now the step that was the one that caused most grief figuring out...

4. $ ./configure --with-php-config=/Applications/DevDesktop/php7_0/bin/php-config CC="gcc -arch i386" CXX="g++ -arch i386"
5. $ make

6. $ cp modules/xdebug.so /Applications/DevDesktop/php7_0/ext/

7. open the php7_0/bin/php.ini file and (assuming it is the default) replace:

   zend_extension="/Applications/DevDesktop/php5_6/ext/opcache.so"

with

;zend_extension="/Applications/DevDesktop/php5_6/ext/opcache.so"
[Xdebug]
zend_extension="/Applications/DevDesktop/php7_0/ext/xdebug.so"
xdebug.remote_enable=1
xdebug.remote_host=localhost
xdebug.remote_port=9000

8. Stop and Start the server instance in DevDesktop and debug away.