Build Qt in "Release with Debug Info" mode?

Question

Is there a way to build Qt in "Release with Debug info" mode ? My application crashes only in "release" mode (works fine in Debug mode) and seems the issue comes from Qt (may be a bug in Qt).So I want to see the debug info of Qt.

Qt docs has "debug" , "release" but not "release with debug" mode.

[Upate]

My application works fine with Mingw 32bit Release/Debug and VSC++ Compiler 64bit Debug.

Only crashes on VSC++ 64Bit Release

Any tips ?

Answer 1

Old question, I know. But nowadays, you can simply use

CONFIG += force_debug_info 

to get debug symbols even in release mode. When you use QMake via the command line, I usually do this to get a release build with debug info:

qmake CONFIG+=release CONFIG+=force_debug_info path/to/sources 

this will enable below conditions of Qt5/mkspecs/features/default_post.prf:

force_debug_info|debug: CONFIG += debug_info force_debug_info {     QMAKE_CFLAGS_RELEASE = $$QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO     QMAKE_CXXFLAGS_RELEASE = $$QMAKE_CXXFLAGS_RELEASE_WITH_DEBUGINFO     QMAKE_LFLAGS_RELEASE = $$QMAKE_LFLAGS_RELEASE_WITH_DEBUGINFO } 

which would even work for Qt 4.x but we would need to manually append above conditions into default_post.prf for Qt 4.x

Answer 2

I use this in my qmake files to build my release versions with debuginfo:

QMAKE_CXXFLAGS_RELEASE = $$QMAKE_CXXFLAGS_RELEASE_WITH_DEBUGINFO QMAKE_CFLAGS_RELEASE = $$QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO QMAKE_LFLAGS_RELEASE = $$QMAKE_LFLAGS_RELEASE_WITH_DEBUGINFO 

This way you can at least check if the crash happens in your code. Building Qt with this mode is not supported, see this bug. You can only do it manually by changing vcproj-files or Makefiles like in the answer of Macke.