[Interest] Qt 5.12.3 build generates absolute library paths in .prl files

[Simon Holmberg]

I'm not well versed in qmake, nor could I find much information about the
.prl files that qmake generates along with its library outputs. But as I've
understood it, they are generated so that future linking against the Qt
libraries (when using qmake) will know which additional library
dependencies are needed.

This has apparently been working fine in the past for us, where a .prl file
would look like this:

[...]
> QMAKE_PRL_VERSION = 5.10.1
> QMAKE_PRL_LIBS = -lmpr -lnetapi32 -luserenv -lversion -lws2_32 -lkernel32
> -luser32 -lshell32 -luuid -lole32 -ladvapi32 -lwinmm -L$$[QT_INSTALL_LIBS]
> $$[QT_INSTALL_LIBS]\\qtpcre2.lib
>

This is all fine and dandy. However, after attempting to upgrade to 5.12.3,
the generated .prl's now look like this for us:

[...]
> QMAKE_PRL_VERSION = 5.12.3
> QMAKE_PRL_LIBS =
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\mpr.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\netapi32.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\userenv.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\version.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\ws2_32.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\kernel32.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\user32.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\shell32.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\uuid.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\ole32.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\advapi32.lib
> C:\\Needy\\cache\\3rdparty\\WinSDK\\WinSDK-10.0.17134.0.1.1.1.1452640\\Win64\\10\\Lib\\10.0.17134.0\\um\\x64\\winmm.lib
> $$[QT_INSTALL_LIBS]/qtpcre2.lib
>

All library paths are now absolute paths! Why is this? Is there some
compilation flag I can use to disable this behaviour?
This is causing us great pain in building PyQt when linking with our local
build of Qt, since the libraries needed to build are in completely
different locations on our build machines.
This article mentions
<https://doc.qt.io/qt-5/qmake-advanced-usage.html#library-dependencies> the
.prl files not being portable between platforms, but surely they're
intended to be between machines?

Thanks!





* Simon Holmberg I Graduate Tools Programmer*

*AVALANCHE STUDIOS*
*Malmö* I *Stockholm **I New York*
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