我正在尝试使用cmake为windows构建assimp。多亏了这里的一些伟人，我已经解决了/MD早期的一些问题。目前的问题是输出文件(.lib和DLL(很大。
我遵循了关于缩小文件大小的一般建议。已禁用测试、导出和使用-O。以下是CMakeLists文件的一部分：
# All supported options ###############################################
OPTION( BUILD_SHARED_LIBS
"Build package with shared libraries."
OFF
)
OPTION( ASSIMP_BUILD_FRAMEWORK
"Build package as Mac OS X Framework bundle."
OFF
)
OPTION( ASSIMP_DOUBLE_PRECISION
"Set to ON to enable double precision processing"
OFF
)
OPTION( ASSIMP_OPT_BUILD_PACKAGES
"Set to ON to generate CPack configuration files and packaging targets"
OFF
)
OPTION( ASSIMP_ANDROID_JNIIOSYSTEM
"Android JNI IOSystem support is active"
OFF
)
OPTION( ASSIMP_NO_EXPORT
"Disable Assimp's export functionality."
ON
)
OPTION( ASSIMP_BUILD_ZLIB
"Build your own zlib"
OFF
)
OPTION( ASSIMP_BUILD_ASSIMP_TOOLS
"If the supplementary tools for Assimp are built in addition to the library."
OFF
)
OPTION ( ASSIMP_BUILD_SAMPLES
"If the official samples are built as well (needs Glut)."
OFF
)
OPTION ( ASSIMP_BUILD_TESTS
"If the test suite for Assimp is built in addition to the library."
OFF
)
OPTION ( ASSIMP_COVERALLS
"Enable this to measure test coverage."
OFF
)
OPTION( ASSIMP_INSTALL
"Disable this if you want to use assimp as a submodule."
ON
)
OPTION ( ASSIMP_ERROR_MAX
"Enable all warnings."
OFF
)
OPTION ( ASSIMP_ASAN
"Enable AddressSanitizer."
OFF
)
OPTION ( ASSIMP_UBSAN
"Enable Undefined Behavior sanitizer."
OFF
)
OPTION ( ASSIMP_BUILD_DOCS
"Build documentation using Doxygen."
OFF
)
OPTION( ASSIMP_INJECT_DEBUG_POSTFIX
"Inject debug postfix in .a/.so/.dll lib names"
ON
)
OPTION ( ASSIMP_IGNORE_GIT_HASH
"Don't call git to get the hash."
OFF
)
结合以下cmake命令
mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS="-Os" -DCMAKE_CXX_FLAGS="/MD /EHsc" ..
这会发出一些警告，但不会失败。这是日志：
-- Building for: Visual Studio 16 2019
-- Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.19042.
-- The C compiler identification is MSVC 19.29.30038.1
-- The CXX compiler identification is MSVC 19.29.30038.1
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30037/bin/Hostx64/x64/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30037/bin/Hostx64/x64/cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30037/bin/Hostx64/x64/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30037/bin/Hostx64/x64/cl.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Shared libraries disabled
-- Looking for ZLIB...
-- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
-- Could not locate ZLIB
-- compiling zlib from sources
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for stdint.h
-- Looking for stdint.h - found
-- Looking for stddef.h
-- Looking for stddef.h - found
-- Check size of off64_t
-- Check size of off64_t - failed
-- Looking for fseeko
-- Looking for fseeko - not found
-- Looking for unistd.h
-- Looking for unistd.h - not found
-- Build an import-only version of Assimp.
-- Enabled importer formats: AMF 3DS AC ASE ASSBIN B3D BVH COLLADA DXF CSM HMP IRRMESH IRR LWO LWS M3D MD2 MD3 MD5 MDC MDL NFF NDO OFF OBJ OGRE OPENGEX PLY MS3D COB BLEND IFC XGL FBX Q3D Q3BSP RAW SIB SMD STL TERRAGEN 3D X X3D GLTF 3MF MMD
-- Disabled importer formats:
-- Configuring done
-- Generating done
结果产生了一个高达122 MB的.lib文件。相比之下，在安卓系统上，我得到了一个12MB.so的文件。已经在没有/MD的情况下进行了尝试，结果大小相当。
知道如何缩小.lib文件吗？VS编译器中有什么设置可以试用吗？
.lib文件是静态库或Windows上DLL的导入库。so文件是一个共享对象库，相当于Windows上的DLL。
根据您的CMakeLists文件和生成的库的大小，您正在构建静态库。要构建assimp的DLL版本，您需要将BUILD_SHARED_LIBS设置为ON。这可以在64位Visual Studio 2019版本的CMake命令行上完成，例如：
cmake -S <sourcedir> -B <builddir> -DBUILD_SHARED_LIBS=ON -G "Visual Studio 16 2019" -A x64