make install after building qt
After building qt from source, you may want to install the build results by running “mingw32-make install”. But wait a minute, you do not really need to install the generated […]
Difference between qmake CONFIG and qtConfig
qmake variable CONFIG contains the conditions that are evaluated to true. CONFIG += abcdefg abcdefg:xxxxx qtConfig is a qmake test function which returns true if the tested feature is an […]
qmake module dependency – $$sort_depends and $$resolve_depends
There exists dependency relationship between qt modules. Some modules can only be built after some other modules are built. This is not only because some modules use the libs/header files […]
gcc error output format
When compiling, gcc may output many error messages which are dazzling. Although you can locate the error in the source code in the end, you may never notice the details […]
qmake spec file qmake.conf
In my previous post what .prf files are automatically loaded by qmake, you have known that qmake will read a spec file qmake.conf before reading your .pro file. This spec […]
How does qmake generate include path?
If you have read my post “Where does Qt find header files“, you have known that qmake will generate some include paths in the makefile to compile your project. For […]
make update makefile
I have a big misunderstanding about make. I thought if I run “make” or “make -f Makefile”, make will check the first target in the makefile and possibly update targets […]
Entering directory and Leaving directory messages in make output
If you ever build a large project, you may notice the entering/leaving directory messages in the output of make command, for example: mingw32-make[2]: Entering directory ‘C:/myproject’ … mingw32-make[2]: Leaving directory […]
qmake functions, variables, and conditions
Some qmake variables, functions, and conditions are hard to know their meanings. I list here for a memo. $$replace(variable, old_string, new_string): replace old_string in variable with new_string. $$unique(variable): remove duplicated […]
percent symbol in windows bat file
Percent symbols are confusing in Windows bat scripts because they are designed with different meanings in different situations. The most occurrences of percent symbols are like %xxx%, where xxx is […]