msvc-reduce-qt-binary-file-size.md

msvc reduce qt binary file size

IMPORTANT NOTE: file size ≈ performance, so reduce file size ≈ reduce performance, so it's not recommended to reduce Qt binary file size.

• Optimize for size instead of speed

  call configure.bat -optimize-size

  or change qtbase\mkspecs\common\msvc-desktop.conf

  QMAKE_CFLAGS_OPTIMIZE = -O1 -Os

• Enable link time code generation

  call configure.bat -ltcg

• Disable RTTI

  change qtbase\mkspecs\common\msvc-desktop.conf

  QMAKE_CXXFLAGS_RTTI_ON =

• Use VC-LTL to reduce MSVCRT library size

• Disable C/C++ exception

  change qtbase\mkspecs\common\msvc-desktop.conf

  QMAKE_CXXFLAGS_STL_ON =
  QMAKE_CXXFLAGS_EXCEPTIONS_ON =

• Use UPX to compress binary files

  upx --best "*.dll"

  or

  upx --ultra-brute "*.dll"