头文件包含静态分析工具？ [英] Header file inclusion static analysis tools?

问题描述

近日透露，我认为我们的一个单一来源文件包括在编译时超过3400头一个同事。我们有获得在构建编过1000翻译单元，产生了巨大的性能损失超过了肯定不是所有的头文件。

A colleague recently revealed to me that a single source file of ours includes over 3,400 headers during compile time. We have over 1,000 translation units that get compiled in a build, resulting in a huge performance penalty over headers that surely aren't all used.

是否有任何静态分析工具，将能够以这样的森林树木阐明，特别是给我们来决定哪些我们应该削出来的工作能力？

Are there any static analysis tools that would be able to shed light on the trees in such a forest, specifically giving us the ability to decide which ones we should work on paring out?

更新

上找到，包括一个头文件的费用一些有趣的信息在这里（和类型，包括警卫，以优化其列入） ，从始发<一个href=\"http://stackoverflow.com/questions/6686836/how-expensive-it-is-for-the-compiler-to-process-an-include-guarded-header\">this问题。

Found some interesting information on the cost of including a header file (and the types of include guards to optimize its inclusion) here, originating from this question.

推荐答案

的输出GCC -w -H＆LT;文件＆gt; 可能是有用的（如果你解析并把一些计数）的 -w 在那里共进晚餐preSS的所有警告，这可能是笨拙的处理。

The output of gcc -w -H <file> might be useful (If you parse it and put some counts in) the -w is there to suppress all warnings, which might be awkward to deal with.

从海合会文档：

-H

打印使用的每个头文件的名称，除了其它正常活动。每名缩进显示在有多深
  的#include 栈是。 precompiled头文件还印，
  即使它们被发现是无效的;无效precompiled头
  文件打印与 ... X 和一个有效的与 ... <！/ code>。

Print the name of each header file used, in addition to other normal activities. Each name is indented to show how deep in the #include stack it is. Precompiled header files are also printed, even if they are found to be invalid; an invalid precompiled header file is printed with ...x and a valid one with ...!.

输出看起来是这样的：

. /usr/include/unistd.h
.. /usr/include/features.h
... /usr/include/bits/predefs.h
... /usr/include/sys/cdefs.h
.... /usr/include/bits/wordsize.h
... /usr/include/gnu/stubs.h
.... /usr/include/bits/wordsize.h
.... /usr/include/gnu/stubs-64.h
.. /usr/include/bits/posix_opt.h
.. /usr/include/bits/environments.h
... /usr/include/bits/wordsize.h
.. /usr/include/bits/types.h
... /usr/include/bits/wordsize.h
... /usr/include/bits/typesizes.h
.. /usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/include/stddef.h
.. /usr/include/bits/confname.h
.. /usr/include/getopt.h
. /usr/include/stdio.h
.. /usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/include/stddef.h
.. /usr/include/libio.h
... /usr/include/_G_config.h
.... /usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/include/stddef.h
.... /usr/include/wchar.h
... /usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/include/stdarg.h
.. /usr/include/bits/stdio_lim.h
.. /usr/include/bits/sys_errlist.h
Multiple include guards may be useful for:
/usr/include/bits/confname.h
/usr/include/bits/environments.h
/usr/include/bits/predefs.h
/usr/include/bits/stdio_lim.h
/usr/include/bits/sys_errlist.h
/usr/include/bits/typesizes.h
/usr/include/gnu/stubs-64.h
/usr/include/gnu/stubs.h
/usr/include/wchar.h

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