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From:	Richard H Lee <ricardohenrylee AT gmail DOT com>
Subject:	Re: Composer segfault on multiple configurations
To:	cygwin AT cygwin DOT com
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Date:	Mon, 22 May 2017 19:38:30 +0100
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On 18/05/2017 08:42, Sky Diver wrote:
> I may compile php from cygports

Just in case Sky Diver or anyone else is interested in compiling php 
from Cygports, here are some simple steps to do so. It's not really 
difficult and most of the time it takes up is downloading the packages 
and compiling php. You'll probably want to do the compilation step 
during a lunch break or something.

If you just want to get a patched php running, just skip to the steps below.

But I'm also putting putting these instructions out here in case anyone 
wants to do some testing. The php devs asked for confirmation that (a) 
the bug exists and (b) this patch actually fixes it, before committing 
the patch.

The devs ask this as they have had problems setting up a dev environment 
for php. So they are unable recreate this bug or test the patch 
themselves. This is why I feel any Cygwin-specific patches for php 
should, for the moment be submitted to Cygwin rather than going to php.

To recreate the bug, create a 4096 bytes php file.
$ for i in $(seq 4096); do echo; done > test.php
Then execute it.
$ php test.php
This should immediately segfault. You can also test it through apache as 
there are two ways this bug can occur, through the php cli and through 
the apache php module. That is why the patch is against two different 
points in the source. By running apache in debug mode, you can see when 
the segfault occurs.
$ /usr/sbin/apachectl -X

Steps
=====

1. Install the php source from cygwin
Install php from the Cygwin installer as normal, except check the Src 
checkbox as well as the Bin checkbox.

2. cd into the source directory
$ cd /usr/src/php-7.0.19-1.src

3. Copy the attachments over in that directory
- dependencies
- php-7.0.19-page-size.patch
- php-cygport-page-size.patch

5. Install the dependencies
There are 59 packages required to build php with cygport, listed in the 
attachment "dependencies". You'll probably use the command line for this 
rather than manually pick out the packages by hand in Cygwin's setup. 
You can either use setup's command line -P option or apt-cyg.
I used apt-cyg, so for me I run:
$ xargs apt-cyg install < dependencies
It will take a while to download all these packages.

4. Patch the cygport file
$ patch < php-cygport-page-size.patch

6. Prepare the source for compilation
$ cygport php.cygport prep

7. Compile php
$ cygport php.cygport compile
Depending on your cpu, this will take a significant amount of time.

8. Install your compiled php into a staging directory
$ cygport php.cygport install

9. Copy the files over from staging into root
$ rsync -varlI php-7.0.19-1.x86_64/inst/. /

10. Rebase the dlls in cygwin
$ rebase-trigger full
Exit all Cygwin processes, command line and services.
Run Cygwin's setup to actually perform the rebase.

If you rerun "php test.php" you now should get 4096 newlines instead of 
a segfault.

Should the patch miss php 7.0.20 or whatever the next version of php is 
for Cygwin, you can rerun the steps and just change the path names in 
steps 2 and 9. But hopefully the path will be merged in by then.




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