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Use PROJECT_SOURCE_DIR for cmake include_directories #471

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Use PROJECT_SOURCE_DIR for cmake include_directories #471

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schultetwin1
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The current usage of the CMAKE_SOURCE_DIR variable causes build breaks
when compiling zlib in a subdirectory of the CMake tree. Instead of
using CMAKE_SOURCE_DIR, we can use PROJECT_SOURCE_DIR to represent the
root directory of where the ZLIB cmake project was declared.

Note, this removes the need to special case include directories for
MSVC.

The current usage of the CMAKE_SOURCE_DIR variable causes build breaks
when compiling zlib in a subdirectory of the CMake tree. Instead of
using CMAKE_SOURCE_DIR, we can use PROJECT_SOURCE_DIR to represent the
root directory of where the ZLIB cmake project was declared.

Note, this removes the need to special case include directories for
MSVC.
@DenizThatMenace
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I would have used CMAKE_CURRENT_SOURCE_DIR instead of PROJECT_SOURCE_DIR but other than that I also recommend to merge this simple PR, because it fixes long standing build problems with the add_subdirectory case and does not break the "build-alone" case.

wantehchang added a commit to wantehchang/zlib that referenced this pull request May 25, 2023
When zlib is built via an add_subdirectory() call, ${CMAKE_SOURCE_DIR}
is the source directory of the parent project. Use
${CMAKE_CURRENT_SOURCE_DIR} instead to refer to the source directory of
the zlib project.

Remove a redundant include_directories(${CMAKE_CURRENT_SOURCE_DIR}) call
in the if(MSVC) block.

Note: This pull request is essentially the same as
madler#471. The only difference is to use
MAKE_CURRENT_SOURCE_DIR instead of PROJECT_SOURCE_DIR.
@wantehchang
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wantehchang commented May 25, 2023

Hi schultetwin1,

I came up with the changes in this pull request (plus the change Bagira80 suggested) independently. I just uploaded #818. If you make the change Bagira80 suggested, I will abandon my pull request.

Thanks,
Wan-Teh

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3 participants