[Replicate] compatibility with PHP 5.x (#97)

original: #96

- Make sure run the test... Run the test for php5.5
- Add readme section about the mismatch of libcrypto from php and awscrt. 

---------

Co-authored-by: Remi Collet <remi@remirepo.net>

.github/workflows/ci.yml

@@ -37,13 +37,12 @@ jobs:
       run: |
         phpize
         ./configure
-        make
-
-    - name: Install dependencies
-      # get path to composer.phar so we can run it with custom php.ini
-      run: |
-        COMPOSER_PHAR=$(realpath $(which composer))
-        php -c php.ini $COMPOSER_PHAR update --no-interaction
+        # Normally, CRT uses the system's default libcrypto.so.
+        # But in this CI run, PHP 5.5 is using a different older libcrypto.so, as PHP 5.5 cannot build with openssl >=1.1.1.
+        # When an applications uses two different libcrypto.so at the same time, things tend to explode.
+        # Therefore, in this CI run we build AWS-LC statically, and use its libcrypto.a instead.
+        USE_OPENSSL=OFF make
+        ./dev-scripts/run_tests.sh
 
   php-linux-x64:
     runs-on: ubuntu-latest

Makefile.frag

@@ -16,8 +16,19 @@ ifneq (OFF,$(USE_OPENSSL))
 	ifneq (ON,$(USE_OPENSSL))
     	CMAKE_PREFIX_PATH=-DCMAKE_PREFIX_PATH=$(USE_OPENSSL)
 	endif
+else
+	# Hide symbols from libcrypto.a
+	# This avoids problems when an application ends up using both libcrypto.a and libcrypto.so.
+	#
+	# An example of this happening is the aws-c-io tests.
+	# All the C libs are compiled statically, but then a PKCS#11 library is
+	# loaded at runtime which happens to use libcrypto.so from OpenSSL.
+	# If the symbols from libcrypto.a aren't hidden, then SOME function calls use the libcrypto.a implementation
+	# and SOME function calls use the libcrypto.so implementation, and this mismatch leads to weird crashes.
+	EXTRA_LDFLAGS="-Wl,--exclude-libs,libcrypto.a"
 endif
 
+
 CMAKE_CONFIGURE = $(CMAKE) \
     -DCMAKE_SOURCE_DIR=$(srcdir) \
     -DCMAKE_BINARY_DIR=$(CMAKE_BUILD_DIR) \

README.md

@@ -1,6 +1,7 @@
 # AWS Common Runtime PHP bindings
 
 ## Requirements
+
 * PHP 5.5+ on UNIX platforms, 7.2+ on Windows
 * CMake 3.x
 * GCC 4.4+, clang 3.8+ on UNIX, Visual Studio build tools on Windows
@@ -17,7 +18,7 @@ pecl install awscrt
 composer require aws/aws-crt-php
 ```
 
-On Windows, you need to build from source as instruction written below for the native extension `php_awscrt.dll`. And, follow https://www.php.net/manual/en/install.pecl.windows.php#install.pecl.windows.loading to load extension. After that:
+On Windows, you need to build from source as instruction written below for the native extension `php_awscrt.dll` . And, follow https://www.php.net/manual/en/install.pecl.windows.php#install.pecl.windows.loading to load extension. After that:
 
 ```
 composer require aws/aws-crt-php
@@ -46,7 +47,7 @@ $ ./dev-scripts/run_tests.sh
 
 From Command Prompt (not powershell). The instruction is based on Visual Studio 2019 on 64bit Windows.
 
-``` bat
+```bat
 > git clone --recursive https://github.com/awslabs/aws-crt-php.git
 > git clone https://github.com/microsoft/php-sdk-binary-tools.git C:\php-sdk
 > C:\php-sdk\phpsdk-vs16-x64.bat
@@ -80,6 +81,7 @@ set CMAKE_GENERATOR_PLATFORM=x64
 ```
 
 ## Debugging
+
 Using [PHPBrew](https://github.com/phpbrew/phpbrew) to build/manage multiple versions of PHP is helpful.
 
 Note: You must use a debug build of PHP to debug native extensions.
@@ -96,13 +98,20 @@ $ ./configure
 $ make CMAKE_BUILD_TYPE=Debug
 ```
 
-Ensure that the php you launch from your debugger is the result of `which php`, not just
+Ensure that the php you launch from your debugger is the result of `which php` , not just
 the system default php.
 
 ## Security
 
 See [CONTRIBUTING](CONTRIBUTING.md#security-issue-notifications) for more information.
 
+## Known OpenSSL related issue (Unix only)
+
+* When your php loads a different version of openssl than your system openssl version, awscrt may fail to load or weirdly crash. You can find the openssl version php linked via: `php -i | grep 'OpenSSL'`, and awscrt linked from the build log, which will be `Found OpenSSL: * (found version *)`
+
+The easiest workaround to those issue is to build from source and get aws-lc for awscrt to depend on instead.
+TO do that, same instructions as [here](#building-from-github-source), but use `USE_OPENSSL=OFF make` instead of `make`
+
 ## License
 
 This project is licensed under the Apache-2.0 License.

ext/php_aws_crt.h

@@ -60,6 +60,8 @@ ZEND_EXTERN_MODULE_GLOBALS(awscrt)
 #    define XRETURN_STRING(s) RETURN_STRING(s, 1)
 #    define XRETVAL_STRINGL(s, l) RETVAL_STRINGL(s, l, 1)
 #    define XRETVAL_STRING(s) RETVAL_STRING(s, 1)
+/* zend_error_noreturn is not public until PHP7, but may still be visible with some PHP 5.X distributions */
+#    define zend_error_noreturn zend_error
 #endif /* PHP 5.x */
 
 #include "api.h"