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ccache 3.2.2 发布，高速的 C/C++编译工具

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ccache 3.2.2 发布，此版本主要包括以下更新：

新特性及性能改善：

Added support for CCACHE_COMPILERCHECK=string:<value>. This is a faster alternative to CCACHE_COMPILERCHECK=<command> if the command’s output can be precalculated by the build system.
Add support for caching code coverage results (compiling for gcov).

Bug 修复：

Fixed bug which could result in false cache hits when source code contains '"' followed by " /*" or " //" (with variations).
Made hash of cached result created with and without CCACHE_CPP2 different. This makes it possible to rebuild with CCACHE_CPP2 set without having to clear the cache to get new results.
Don’t try to reset a non-existing stats file. This avoids “No such file or directory” messages in the ccache log when the cache directory doesn’t exist.
Fixed a bug where ccache deleted clang diagnostics after compiler failures.
Avoid performing an unnecessary copy of the object file on a cache miss.
Bail out on too hard compiler option -fmodules.
Bail out on too hard compiler option -fplugin=libcc1plugin (interaction with GDB).
Fixed build error when compiling ccache with recent clang versions.
Removed signal-unsafe code from signal handler.
Corrected logic for when to output cached stderr.
Wipe the whole cached result on failure retrieving a cached file.
Fixed build error when compiling ccache with recent clang versions.

详细信息请查看发行页面。

此版本现已提供下载：

https://github.com/jrosdahl/ccache/archive/v3.2.2.zip

ccache（“compiler cache”的缩写）是一个编译器缓存，该工具会高速缓存编译生成的信息，并在编译的特定部分使用高速缓存的信息，比如头文件，这样就节省了通常使用 cpp 解析这些信息所需要的时间。如果您编译清单 2 中的文件，假定 foobar.h 中包含对其他头文件的引用，ccache 会用那个文件的 cpp-parsed 版本来取代 include 声明。就那么简单。不是真正去读取、理解并解释其内容，ccache 只是将最终的文本拷贝到文件中，使得它可以立即被编译。

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