无法通过cmake在Windows上编译libpng 1.6：无法打开包含文件：'zlib.h'：无此类文件或目录 [英] Can't compile libpng 1.6 on windows via cmake: Cannot open include file: 'zlib.h': No such file or directory

问题描述

VS 2015 Update1。
预构建的zlib被提取到project / zlib中。 find_package使用提供的适当的var可以很好地找到它。
它添加了包含在cl调用中的目录：

C：\Program Files（x86）\Microsoft Visual Studio 14.0\VC\bin＼ 86x86_amd64\CL.exe / c / IC：\project\zlib\include / IC：\project\libpng / nologo / W3 / WX- / O2 / Ob2 / D WIN32 / D _WINDOWS / D NDEBUG / D _CRT_SECURE_NO_DEPRECATE / D CMAKE_INTDIR = \发布\ / D _MBCS / Gm- / MD / GS / fp：precise / Zc：wchar_t / Zc：forScope / Zc：inline /Fo\"png16_static.dir\ Release\\ /Fd\"png16_static.dir\发布\png16_static.pdb / Gd / TC / errorReport：队列C：\project\libpng\png.c C：\project\libpng errorpngerror.c C：\project\libpng\pngget.c C：\project\libpng\pngmem.c C：\project\libpng\pngpread.c C：\project＼ ＼libpng\pngread.c C：\project\libpng\pngrio.c C：\project\libpng\pngrtran.c C：\project\libpng\pngrutil.c C：\ C：\project\libpng\pngset.c C：\project\libpng\pngtrans.c C：\project\libpng\pngwio.c C：\project\libpng\pngwrite.c C： Cproject\libpng\pngwtran.c C：\project\libpng\pngwutil.c


VS 2015 Update 1. Prebuilt zlib is extracted into project/zlib. find_package finds it alright with proper vars supplied. It adds the dir as include in cl invocation: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\CL.exe /c /IC:\project\zlib\include /IC:\project\libpng /nologo /W3 /WX- /O2 /Ob2 /D WIN32 /D _WINDOWS /D NDEBUG /D _CRT_SECURE_NO_DEPRECATE /D "CMAKE_INTDIR=\"Release\"" /D _MBCS /Gm- /MD /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"png16_static.dir\Release\\" /Fd"png16_static.dir\Release\png16_static.pdb" /Gd /TC /errorReport:queue C:\project\libpng\png.c C:\project\libpng\pngerror.c C:\project\libpng\pngget.c C:\project\libpng\pngmem.c C:\project\libpng\pngpread.c C:\project\libpng\pngread.c C:\project\libpng\pngrio.c C:\project\libpng\pngrtran.c C:\project\libpng\pngrutil.c C:\project\libpng\pngset.c C:\project\libpng\pngtrans.c C:\project\libpng\pngwio.c C:\project\libpng\pngwrite.c C:\project\libpng\pngwtran.c C:\project\libpng\pngwutil.c

但它在编译过程中失败：

but it fails during compilation with:

c：\project\libpng\pngstruct.h（30）：致命错误C1083：无法打开包含文件：'zlib.h'：没有这样的文件或目录等。

看不到有什么问题。肯定在 C：\project\zlib\include

Can't see what's could be wrong. There is definitely zlib.h inside C:\project\zlib\include

推荐答案

我不敢相信原因是多么愚蠢。问题是在CI上，zlib的内容被提取到一个额外的zlib文件夹中（所以它是zlib / zlib），因为存档已经包含zlib文件夹。

I can't believe how stupid the reason was. The problem was that on CI zlib contents got extracted into one extra zlib folder (so it was zlib/zlib) since archive already contained zlib folder.

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