使用预编译的头文件减少clang编译时间 [英] Decrease clang compile time with precompiled headers

问题描述

我正在做一个数据库项目，该项目将查询（以某种高级语言表示）编译成c ++代码。此代码由数据库编译和执行。那部分工作得很好。

I am working on a database project that compiles queries (expressed in some higher level language) into c++ code. This code is compiled and executed by the database. That part works perfectly fine.

现在，我正在尝试减少C ++查询代码的编译时间。我想知道我是否可以使用预编译的标头来提高性能。

Right now, I am trying to reduce the compile time for the C++ query code. I was wondering whether I can use precompiled headers to gain performance here.

查询被转换为一个名为Query.cpp的文件，该文件包括library / src / Database.hpp。 Database.hpp文件包含更多文件，例如StandardTypes.hpp等。我可以预编译所有这些头文件以加快Query.cpp的编译速度吗？如果是，我该怎么做？到目前为止，我找不到任何预编译标头的好例子，只有一些非常基本的东西。

The query is translated into a file called Query.cpp which includes library/src/Database.hpp. The Database.hpp file includes further files like StandardTypes.hpp and so on. Can I precompile all those header files to speed up the compilation of Query.cpp? If yes, how can I do that? I could not find any good example for precompiled headers so far, only some really basic stuff.

我使用以下命令来编译Query.cpp：

I use the following command to compile Query.cpp:

clang++ -fPIC -std=c++11 Query.cpp -I./library/src/ -shared -o libquery.so;

推荐答案

来创建预编译的头文件，包括您所拥有的所有头文件不要更改为Query.h并使用：

to create pre-compiled header include all the headers you don't change into Query.h and use:

clang -cc1 Query.h -emit-pch -o Query.h.pch

使用预编译的标头类型：

to use the pre-compiled header type:

clang -cc1 -include-pch Query.h.pch Query.cpp -shared -o libquery.so;

Query.cpp需要包含Query.h

Query.cpp needs to include Query.h

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