C++ cmake - CMakeLists.txt 不在根文件夹中（但包含在源代码中）
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cmake - CMakeLists.txt is not in root folder (but is included in source)
提问by dvdkouril
I'm trying to compile a libpng library. The thing is that I need a specific version of this library - 1.2.37 - because the project I'm using it in is written with this version. I've found the source code of this version here(GnuWin32 project).
我正在尝试编译一个 libpng 库。问题是我需要这个库的特定版本 - 1.2.37 - 因为我正在使用它的项目是用这个版本编写的。我发现这个版本的源代码在这里（的GnuWin32项目）。
But the folder structure looks something like this:
但是文件夹结构看起来像这样：
libpng-1.2.37-src/
contrib/
projects/
scripts/
CMakeLists.txt
png.h
pngread.c
pngwrite.c
...
See, the CMakeLists.txt is one level deeper than the source files.
看，CMakeLists.txt 比源文件更深一层。
I've tried:
我试过了：
- source directory libpng-1.2.37-src/-> resulted in error: The source directory does not appear to contain CMakeLists.txt
- source directory libpng-1.2.37-src/scripts-> resulted in multiple errors: File libpng-1.2.37-src/scripts/scripts/libpng.pc.in does not exist.
- copy CMakeLists.txt from /scriptsto /libpng-1.2.37-srcand set source directory to /libpng-1.2.37-src-> resulted in error: The source "/libpng-1.2.37-src/CMakeLists.txt" does not match the source "/libpng-1.2.37-src/scripts/CMakeLists.txt" used to generate cache.
- 源目录libpng-1.2.37-src/-> 导致错误：源目录似乎不包含 CMakeLists.txt
- 源目录libpng-1.2.37-src/scripts-> 导致多个错误：文件 libpng-1.2.37-src/scripts/scripts/libpng.pc.in 不存在。
- 将 CMakeLists.txt 从/scripts复制到/libpng-1.2.37-src并将源目录设置为/libpng-1.2.37-src-> 导致错误：源“/libpng-1.2.37-src/CMakeLists.txt " 与用于生成缓存的源 "/libpng-1.2.37-src/scripts/CMakeLists.txt" 不匹配。
What should I do to make it work? I don't know why the CMakeLists.txt file would be included if it can't be used.
我该怎么做才能让它发挥作用？我不知道为什么不能使用 CMakeLists.txt 文件。
采纳答案by Silex
The INSTALLfile explicitely says:
该INSTALL文件明确指出：
If you want to use "cmake" (see www.cmake.org), copy CMakeLists.txt
from the "scripts" directory to this directory and type
cmake . [-DPNG_MMX=YES] -DCMAKE_INSTALL_PREFIX=/path
make
make install
And as a side note, before this it says that the classic way to install it is:
作为旁注，在此之前它说安装它的经典方法是：
On Unix/Linux and similar systems, you can simply type
./configure [--prefix=/path]
make check
make install
It sounds like you did right with 3), however you forgot to cleanup the build dir before trying again.
听起来您对 3) 的处理是正确的，但是您在重试之前忘记清理构建目录。
回答by Vaclav P.
If it's library which you use in your project you can build it automatically via technique called 'superbuild' (use ExternalProject_Add). By specifying SOURCE_SUBDIR as is described hereto subdirectory with CMakeLists.txt you can do something like this
如果它是您在项目中使用的库，则可以通过称为“superbuild”的技术（使用 ExternalProject_Add）自动构建它。通过将此处描述的 SOURCE_SUBDIR 指定为CMakeLists.txt 的子目录，您可以执行以下操作
ExternalProject_Add(libpng
GIT_REPOSITORY url-to-your-repository.git
GIT_TAG v1.2.37
SOURCE_SUBDIR "scripts"
