如何从VCL重新编译特定单元？
我想将 QC 的修复应用到 Delphi 2009 单元（碰巧是 DBClient）。 我知道我需要将该单元复制到另一个目录并对副本进行更改。 然后我如何让 Delphi 编译该单元并使用它来支持已经存在的 DCU？
I want to apply a fix from QC to a Delphi 2009 unit (DBClient as it happens). I know I need to copy the unit to another directory and make the change to the copy. How do I then get Delphi to compile that unit and use it in favour of the DCU that already exists?
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如果您不想修改原始 .Pas 文件，我可以将 .Pas 文件复制到我的应用程序文件夹中，然后选择构建项目，它将在我的应用程序文件夹中创建新的 dcu 文件，该文件将用来代替原来的。
If you don't want to modify the original .Pas file, I do this by copy the .Pas file into my application folder, then choose built project, it will create new dcu file in my application folder, which will be used instead of the original one.
这是最后的手段（CodeGear 不支持），但必要时我会做类似于 Mohammed 的事情。 除了没有将任何修改过的单元放入应用程序文件夹中之外，我将它们与库代码的其余部分一起放入自己的文件夹中，并将此文件夹包含在我的库路径中，我的所有项目都将在其中使用它。 它还可以防止我拥有多个（可能略有不同）副本。
我还特意检查所有更新，看看发生了什么变化，这样我就可以删除修改过的单元，或者将更改重新应用到 CodeGear 中较新（并且可能更好）的单元。
It's kind of a last resort (and not supported by CodeGear), but I do something similar to Mohammed when necessary. Except instead of putting any modified units into the application folder, I put them into their own folder with the rest of my library code and include this folder in my library path where it will be used by all of my projects. It also prevents me from having multiple (possibly slightly different) copies hanging around.
I also make a point of checking any updates to see what has changed so I can either remove the modified units or re-apply the changes to the newer (and presumably better) units from CodeGear.
我自己从未这样做过，但
{RAD}\source\rtl中有项目以及批量构建脚本。 我相信这使得重新编译 RTL 函数变得容易。 其他单元应该更容易重新编译。如果您想要进行的更改是本地的，并且这些单元没有被其他 RTL/VCL 单元广泛使用，那么最简单的方法是将修改单元的副本与其标准位置分开放置。
另一种选择是运行时修补，也称为绕道。
I've never did this myself but there are projects in
{RAD}\source\rtlalong with batch build script. I believe this makes recompiling RTL functions easy. Other units should be recompiled easier.If the changes you want to do are local and the units aren't widely used by other RTL/VCL units, the simplest way is to place copies of modified units separately from their standard place.
Another option is run-time patching aka detouring.