fix_poco_shared_build

[SnowinterCat]

• Fix Poco libraries cannot compile with shared build on Windows
• Fix: Compiling Poco's xml module has some problems due to missing macros with the expat static library. Appending macros directly will cause to fail to compile Poco with a dynamic expat library. Change some previous code to be executed only when expat is a static library.
• Fix: Compiling Poco's foundation module has some problems due to missing macros with the pcre2 static library. Appending macros directly will cause to fail to compile Poco with a dynamic pcre2 library. Change some previous code to be executed only when pcre2 is a static library.
• Refine the Poco library modules so that you don't need to install the entire Poco library if you only need a small part of it.
• Provide the option of mariadb when using the MySql module in Poco (not selectable at the same time as mysql).

[SnowinterCat]

Poco库的mysql模块本身是支持Mysql或者MariaDB的，不过它的头文件里面写死了使用

#include <mysql/mysql.h>

但是xmake-repo编译出来的MariaDB的头文件是: mariadb/mysql.h 我为了进行支持，在用户选择Poco中的mariadb选项的时候，将Poco/Data/MySQL模块中所有用到了

#include <mysql/mysql.h>

都改成了

#include <mariadb/mysql.h>

来进行支持。 这样子做好吗？如果不好的话，有没有别的办法？ @waruqi

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The mysql module of the Poco library itself supports Mysql or MariaDB, but its use is hard-coded in its header file.

#include <mysql/mysql.h>

But the header file of MariaDB compiled by xmake-repo is: mariadb/mysql.h In order to provide support, when the user selects the mariadb option in Poco, I use all the modules in the Poco/Data/MySQL module.

#include <mysql/mysql.h>

All changed to

#include <mariadb/mysql.h>

to support. Is this a good idea? If it's not good, is there any other way? @waruqi

[waruqi]

Poco库的mysql模块本身是支持Mysql或者MariaDB的，不过它的头文件里面写死了使用

#include <mysql/mysql.h>

但是xmake-repo编译出来的MariaDB的头文件是: mariadb/mysql.h 我为了进行支持，在用户选择Poco中的mariadb选项的时候，将Poco/Data/MySQL模块中所有用到了

#include <mysql/mysql.h>

都改成了

#include <mariadb/mysql.h>

来进行支持。 这样子做好吗？如果不好的话，有没有别的办法？ @waruqi

可以

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The mysql module of the Poco library itself supports Mysql or MariaDB, but its use is hard-coded in its header file.

#include <mysql/mysql.h>

But the header file of MariaDB compiled by xmake-repo is: mariadb/mysql.h. For support, when the user selects the mariadb option in Poco, all the modules in Poco/Data/MySQL are used.

#include <mysql/mysql.h>

All changed to

#include <mariadb/mysql.h>

for support. Is this a good idea? If it's not good, is there any other way? @waruqi

Can

[waruqi]

@star-hengxing https://github.com/xmake-io/xmake-repo/commit/9b9642fe7120272115020c065734b1ad6a3f3da9

这个 patch break 了 boost

error: ./packages/b/boost/xmake.lua:285: 'then' expected near '!'

[SnowinterCat]

在android平台上的armeabi-v7a架构r22中，会因为pcre2需要大于r22的ndk而失败，但是在arm64-v8a架构r22下不会，这个是什么原因呢？

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In the armeabi-v7a architecture r22 on the android platform, it will fail because pcre2 requires an ndk larger than r22, but it will not fail in the arm64-v8a architecture r22. What is the reason for this?

[SnowinterCat]

这个Wasm平台会出现poco找不到pcre2，这就很奇怪了。我手动指定了pcre2的路径也不行，我只能暂时让poco不支持wasm了

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This Wasm platform will show that poco cannot find pcre2, which is very strange. Even if I manually specify the path to pcre2, it doesn't work. I can only temporarily disable poco from supporting wasm.

[star-hengxing]

在android平台上的armeabi-v7a架构r22中，会因为pcre2需要大于r22的ndk而失败，但是在arm64-v8a架构r22下不会，这个是什么原因呢？

因为 pcre2 加了 on_check 过滤 ci https://github.com/xmake-io/xmake-repo/pull/4173

[star-hengxing]

这个Wasm平台会出现poco找不到pcre2，这就很奇怪了。我手动指定了pcre2的路径也不行，我只能暂时让poco不支持wasm了

这个不知道是 cmake or xmake 的原因，很多包在 wasm 平台上总是 find_package 失败

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This Wasm platform will show that poco cannot find pcre2, which is very strange. Even if I manually specify the path to pcre2, it doesn't work. I can only temporarily disable poco from supporting wasm.

I don’t know if this is caused by cmake or xmake. Many packages always fail to find_package on the wasm platform.

[SnowinterCat]

在android平台上的armeabi-v7a架构r22中，会因为pcre2需要大于r22的ndk而失败，但是在arm64-v8a架构r22下不会，这个是什么原因呢？

因为 pcre2 加了 on_check 过滤 ci #4173

我其实是奇怪，为什么armeabi-v7a架构r22会报错 need ndk > 22，但是arm64-v8a架构r22 不会报错 need ndk > 22。就不是很方便做检查。不过既然pcre2已经有这个检查了，那poco应该就没必要加了吧

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In the armeabi-v7a architecture r22 on the android platform, it will fail because pcre2 requires an ndk larger than r22, but not in the arm64-v8a architecture r22. What is the reason for this?

Because pcre2 added on_check filtering ci #4173

I am actually curious why the armeabi-v7a architecture r22 will report the error need ndk > 22, but the arm64-v8a architecture r22 will not report the error need ndk > 22. It is not very convenient for inspection. But since pcre2 already has this check, there should be no need for poco to add it.

[SnowinterCat]

@waruqi 这下应该正式完工了，如果只有三个因为pcre2的ndk版本导致的失败的话

[SnowinterCat]

最后的on_test中注释掉的那5个是exe，没有头文件我不清楚怎么测试。等以后别人来补充吧

[SnowinterCat]

所以如果全部编译，应该是22个dll（MySql模块和MariaDB模块冲突），加上Windows特供的NetSSL_Win.dll，一共23个；加上5个exe

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@waruqi It should be officially completed now, if there are only three failures caused by the ndk version of pcre2

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The 5 commented out in the last on_test are exe. I don’t know how to test without the header file. Let others add it later.

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So if you compile them all, there should be 22 dlls (the MySql module conflicts with the MariaDB module), plus NetSSL_Win.dll specially provided for Windows, a total of 23; plus 5 exes