【发布时间】：2021-09-24 05:26:51
【问题描述】：
我正在尝试使用 cmake 为 Windows 构建 assimp。感谢这里的一些好人，我已经解决了 /MD 的一些早期问题。目前的问题是输出文件（.lib 和 DLL）很大。
我已遵循有关缩小文件大小的一般建议。禁用测试、导出和使用 -Os。这是 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
)
结合下面的cmake命令
mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS="-Os" -DCMAKE_CXX_FLAGS="/MD /EHsc" ..
这会给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
生成高达 122 MB 的 .lib 文件。作为比较，在 Android 上，我得到一个 12 MB 的 .so 文件。已经在不使用 /MD 的情况下尝试过，结果大小相当。
知道如何缩小 .lib 文件吗？ VS编译器里面有什么设置可以试试吗？
【问题讨论】：