QMake variables

Michael Sumulong

I'm currently developing in Qt 5.5.0 w/ the MinGW version in Windows. In my .pro file, I'd like to know where the MinGW toolchain is installed (ie. C:\Qt\Qt5.5.0\Tools\mingw492_32\bin) but I can't seem to find an environment variable that points to it...

I've only been able to find these QMAKE variables:

c:\Qt\Qt5.5.0\5.5\mingw492_32\bin>qmake.exe -query
QT_SYSROOT:
QT_INSTALL_PREFIX:C:/Qt/Qt5.5.0/5.5/mingw492_32
QT_INSTALL_ARCHDATA:C:/Qt/Qt5.5.0/5.5/mingw492_32
QT_INSTALL_DATA:C:/Qt/Qt5.5.0/5.5/mingw492_32
QT_INSTALL_DOCS:C:/Qt/Qt5.5.0/Docs/Qt-5.5
QT_INSTALL_HEADERS:C:/Qt/Qt5.5.0/5.5/mingw492_32/include
QT_INSTALL_LIBS:C:/Qt/Qt5.5.0/5.5/mingw492_32/lib
QT_INSTALL_LIBEXECS:C:/Qt/Qt5.5.0/5.5/mingw492_32/bin
QT_INSTALL_BINS:C:/Qt/Qt5.5.0/5.5/mingw492_32/bin
QT_INSTALL_TESTS:C:/Qt/Qt5.5.0/5.5/mingw492_32/tests
QT_INSTALL_PLUGINS:C:/Qt/Qt5.5.0/5.5/mingw492_32/plugins
QT_INSTALL_IMPORTS:C:/Qt/Qt5.5.0/5.5/mingw492_32/imports
QT_INSTALL_QML:C:/Qt/Qt5.5.0/5.5/mingw492_32/qml
QT_INSTALL_TRANSLATIONS:C:/Qt/Qt5.5.0/5.5/mingw492_32/translations
QT_INSTALL_CONFIGURATION:
QT_INSTALL_EXAMPLES:C:/Qt/Qt5.5.0/Examples/Qt-5.5
QT_INSTALL_DEMOS:C:/Qt/Qt5.5.0/Examples/Qt-5.5
QT_HOST_PREFIX:C:/Qt/Qt5.5.0/5.5/mingw492_32
QT_HOST_DATA:C:/Qt/Qt5.5.0/5.5/mingw492_32
QT_HOST_BINS:C:/Qt/Qt5.5.0/5.5/mingw492_32/bin
QT_HOST_LIBS:C:/Qt/Qt5.5.0/5.5/mingw492_32/lib
QMAKE_SPEC:win32-g++
QMAKE_XSPEC:win32-g++
QMAKE_VERSION:3.0
QT_VERSION:5.5.0

Is there anywhere else I can look?

SGaist

Hi,

There's no pre-made Qt variable for that.

Out of curiosity, why do you need that ?

Michael Sumulong

@SGaist I'm currently using protobuf in my application and I use MSYS & Qt's MinGW toolchain to compile protobuf.
Using a .pri file similar to this: https://github.com/bitcoin/bitcoin/blob/master/share/qt/protobuf.pri

Compiling protobuf under MSYS places the protoc.exe compiler in C:\Qt\Qt5.5.0\Tools\mingw492_32\bin. I'd like to have a way of not hard coding the path because some team members may not be at the same Qt version.

SGaist

If don't have a windows with MinGW at hand but check the Build panel for the PATH environment variable, this one will probably contain C:\Qt\Qt5.5.0\Tools\mingw492_32\binso you don't need to set a particular path from your pro file.

Michael Sumulong

@SGaist Yea, I did see that but I use the following to test to make sure protoc.exe exists (using a hard-coded path):

win32:PROTOC_FILENAME=protoc.exe
unix:PROTOC_FILENAME=protoc
PROTOC = C:/Qt/Qt5.5.0/Tools/mingw492_32/bin/$$PROTOC_FILENAME
exists( $$PROTOC )

I'm not certain how to go about using PATH to look for the protoc executable.

SGaist

That's the thing, since the build environment PATH variable contains the path for MinGW, you shouldn't need the full path to protoc.exe

Michael Sumulong

@SGaist I understand that protoc.exe will run since it's in the PATH. My problem is that I want to be able to make sure it is installed in the system first. The exists() function doesn't seem like it uses the PATH environment variable and requires and absolute full path to protoc.exe. I think my only solution is to iterate through each entry in PATH and test for protoc.exe that way.

SGaist

You could also try with system