在Windows上编译PHP扩展组件的问题

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在Windows上编译PHP扩展组件的问题

这两天需要编译一个PHP扩展来实现特定的功能，参考了网上N多文章，最后发现两件宝贝，其一是php_screw，另外一件是Cygwin。
首先编译php_screw，以便有个感性的印象，编译通过没问题，然后自己试图往里增加一些代码，磕磕碰碰地最后也编译成功了。可是放到Apache上试用时，却经常出现内存读写异常，修修改改了好久还没无法解决。

于是，想自己重头开始做，参考php_screw往里一点点添代码，看看能不能解决问题。
根据网上教程，在Cygwin里用命令：
php ext_skel_win32.php --extname=mytest
生成测试用程序框架，然后直接编译框架，一切都很顺利，再往里增加一个功能函数，放到Apache测试，也都正常，但到了往下面两个函数：
PHP_MINIT_FUNCTION(mytest)
和
PHP_MSHUTDOWN_FUNCTION(mytest)
的 return SUCCESS 前面增加
CG(extended_info) = 1;
，然后再编译，则出现了编译错误：

Cpp代码

1. 1.Deleting intermediate files and output files for project 'mytest - Win32 Debug_TS'.   
   
2. 2.--------------------Configuration: mytest - Win32 Debug_TS--------------------   
   
3. 3.Compiling...   
   
4. 4.mytest.c   
   
5. 5.Linking...   
   
6. 6.   Creating library Debug_TS/php_mytest.lib and object Debug_TS/php_mytest.exp   
   
7. 7.mytest.obj : error LNK2001: unresolved external symbol _compiler_globals_id   
   
8. 8...\..\Debug_TS/php_mytest.dll : fatal error LNK1120: 1 unresolved externals   
   
9. 9.Error executing link.exe.   
   
10. 10.Creating browse info file...   
    
11. 11.  
    
12. 12.php_mytest.dll - 2 error(s), 0 warning(s)  
    
13. Deleting intermediate files and output files for project 'mytest - Win32 Debug_TS'.
    
14. --------------------Configuration: mytest - Win32 Debug_TS--------------------
    
15. Compiling...
    
16. mytest.c
    
17. Linking...
    
18.    Creating library Debug_TS/php_mytest.lib and object Debug_TS/php_mytest.exp
    
19. mytest.obj : error LNK2001: unresolved external symbol _compiler_globals_id
    
20. ..\..\Debug_TS/php_mytest.dll : fatal error LNK1120: 1 unresolved externals
    
21. Error executing link.exe.
    
22. Creating browse info file...
    
23. 
    
24. php_mytest.dll - 2 error(s), 0 warning(s)

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网上搜索了好久，我试了都不行，所以怀疑是编译器配置的问题，于是打开php_screw和mytest两个工程，对编译参数一项项比对，最后发现：

1. 自动生成的编译参数如下Project --> Setting --> C/C++ -->Preprocessor definitions:：
   
2. ZEND_DEBUG=1,WIN32,NDEBUG,_WINDOWS,_MBCS,_USRDLL,MYTEST_EXPORTS, COMPILE_DL_MYTEST,ZTS=1,ZEND_WIN32,PHP_WIN32,HAVE_MYTEST=1,LIBZEND_EXPORTS
   
3. 而php_screw的对应参数则如下：
   
4. ZEND_DEBUG=0,WIN32,NDEBUG,_WINDOWS,_MBCS,_USRDLL,SCREW_EXPORTS, COMPILE_DL_SCREW, ZTS=1,ZEND_WIN32,PHP_WIN32,HAVE_SCREW=1

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,对比可以发现：
1、自动生成框架的 ZEND_DEBUG=1， 而php_screw的 ZEND_DEBUG=0;
2、自动生成框架的参数中多一个 LIBZEND_EXPORTS ;
我于是对这两个参数分别测试：
1、把 ZEND_DEBUG=1 改成 ZEND_DEBUG=0，再编译，报错如下：

Cpp代码

1. 1.Deleting intermediate files and output files for project 'mytest - Win32 Debug_TS'.   
   
2. 2.--------------------Configuration: mytest - Win32 Debug_TS--------------------   
   
3. 3.Compiling...   
   
4. 4.mytest.c   
   
5. 5.Linking...   
   
6. 6.   Creating library Debug_TS/php_mytest.lib and object Debug_TS/php_mytest.exp   
   
7. 7.mytest.obj : error LNK2001: unresolved external symbol _compiler_globals_id   
   
8. 8...\..\Debug_TS/php_mytest.dll : fatal error LNK1120: 1 unresolved externals   
   
9. 9.Error executing link.exe.   
   
10. 10.Creating browse info file...   
    
11. 11.  
    
12. 12.php_mytest.dll - 2 error(s), 0 warning(s)  
    
13. Deleting intermediate files and output files for project 'mytest - Win32 Debug_TS'.
    
14. --------------------Configuration: mytest - Win32 Debug_TS--------------------
    
15. Compiling...
    
16. mytest.c
    
17. Linking...
    
18.    Creating library Debug_TS/php_mytest.lib and object Debug_TS/php_mytest.exp
    
19. mytest.obj : error LNK2001: unresolved external symbol _compiler_globals_id
    
20. ..\..\Debug_TS/php_mytest.dll : fatal error LNK1120: 1 unresolved externals
    
21. Error executing link.exe.
    
22. Creating browse info file...
    
23. 
    
24. php_mytest.dll - 2 error(s), 0 warning(s)

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2、再把 LIBZEND_EXPORTS 去掉，再编译，错误消失：

Cpp代码

1. 1.Deleting intermediate files and output files for project 'mytest - Win32 Debug_TS'.   
   
2. 2.--------------------Configuration: mytest - Win32 Debug_TS--------------------   
   
3. 3.Compiling...   
   
4. 4.mytest.c   
   
5. 5.Linking...   
   
6. 6.   Creating library Debug_TS/php_mytest.lib and object Debug_TS/php_mytest.exp   
   
7. 7.Creating browse info file...   
   
8. 8.  
   
9. 9.php_mytest.dll - 0 error(s), 0 warning(s)  
   
10. Deleting intermediate files and output files for project 'mytest - Win32 Debug_TS'.
    
11. --------------------Configuration: mytest - Win32 Debug_TS--------------------
    
12. Compiling...
    
13. mytest.c
    
14. Linking...
    
15.    Creating library Debug_TS/php_mytest.lib and object Debug_TS/php_mytest.exp
    
16. Creating browse info file...
    
17. 
    
18. php_mytest.dll - 0 error(s), 0 warning(s)

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3、再把 ZEND_DEBUG=0 重新改成 ZEND_DEBUG=1，再编译，无错：

Cpp代码

1. 1.Deleting intermediate files and output files for project 'mytest - Win32 Debug_TS'.   
   
2. 2.--------------------Configuration: mytest - Win32 Debug_TS--------------------   
   
3. 3.Compiling...   
   
4. 4.mytest.c   
   
5. 5.Linking...   
   
6. 6.   Creating library Debug_TS/php_mytest.lib and object Debug_TS/php_mytest.exp   
   
7. 7.Creating browse info file...   
   
8. 8.  
   
9. 9.php_mytest.dll - 0 error(s), 0 warning(s)  
   
10. Deleting intermediate files and output files for project 'mytest - Win32 Debug_TS'.
    
11. --------------------Configuration: mytest - Win32 Debug_TS--------------------
    
12. Compiling...
    
13. mytest.c
    
14. Linking...
    
15.    Creating library Debug_TS/php_mytest.lib and object Debug_TS/php_mytest.exp
    
16. Creating browse info file...
    
17. 
    
18. php_mytest.dll - 0 error(s), 0 warning(s)

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所以，问题是由于 LIBZEND_EXPORTS 参数引起的，但由于对VC不熟且对Zend API更面生的缘故，只能是知其然而不可知其所以然也；

龙骑士-lq

哇  楼主 强大啊