changes in code not making any difference in output

[sh123]

previously when i had this problem it somehow got solved after restarting.but this problem arises after a regular interval of time.This time restarting is also not helping.I am compiling in the right directory.saving changes of right file,right directory.can u please help.

[wysota]

Are you using Visual Studio? It is known to play such tricks.

[sh123]

No I am not using visual studio.I am using notepad & textpad

[wysota]

Maybe you somehow operated on different files? Could you verify that the size/access date of the appropriate files get changed and calling make afterwards doesn't rebuild them?

[sh123]

I am operating on the correct file.I also verified the modified date is shown the latest.i.e.I modified it today so it is showing todays date.but after make there is no change in the output. make returned the following:
D:\Qt\4.4.3\AnalogWidgets\analogwidgets\code>make
mingw32-make -f Makefile.Release all
mingw32-make[1]: Entering directory `D:/Qt/4.4.3/AnalogWidgets/analogwidgets/cod
e'
g++ -c -march=pentium3 -Os -Wall -pipe -mfpmath=sse -Wall -frtti -fexceptions -m
threads -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_NO_DEBUG -DQT_SCRIPT_LIB -DQT_SVG_
LIB -DQT_XML_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -I"..\..\..\incl
ude\QtCore" -I"..\..\..\include\QtCore" -I"..\..\..\include\QtGui" -I"..\..\..\i
nclude\QtGui" -I"..\..\..\include\QtXml" -I"..\..\..\include\QtXml" -I"..\..\..\
include\QtSvg" -I"..\..\..\include\QtSvg" -I"..\..\..\include\QtScript" -I"..\..
\..\include\QtScript" -I"..\..\..\include" -I"..\analogwidgets" -I"d:\Qt\4.4.3\i
nclude\ActiveQt" -I"tmp\moc\release_shared" -I"." -I"..\..\..\mkspecs\win32-g++"
-o ..\objects\thermometer.o thermometer.cpp
ar -M < object_script.libanalogwidgets.Release
mingw32-make[1]: Leaving directory `D:/Qt/4.4.3/AnalogWidgets/analogwidgets/code
'
mingw32-make -f Makefile.Debug all
mingw32-make[1]: Entering directory `D:/Qt/4.4.3/AnalogWidgets/analogwidgets/cod
e'
mingw32-make[1]: Nothing to be done for `all'.
mingw32-make[1]: Leaving directory `D:/Qt/4.4.3/AnalogWidgets/analogwidgets/code
'

[wysota]

From what I see thermometer.cpp was recreated, so there definitely is some change in the output. "ar" is used to build static libraries. If you use the library for any projects, you have to rebuild those projects as well.