[SOLVED] qt6 and pkgconfig files

Keith Hedger · 05-29-2023, 10:09 AM

Has any one built qt6 on lfs yet, and did you manage to generate the .pc pkgconfig files, if so how, I can build qt6 fine just cant get the pc files.

using this script to build
https://github.com/KeithDHedger/LFSP...6/qt6.LFSBuild

arch-linq · 05-30-2023, 02:53 AM

I have qt 6.5.0 working fine. That script has too many exports and other unncecessary stuff imo.

Trim it down to a combo of arch and blfs. Here's mine:

Code:

 mkdir ~/qt-build
cd ~/qt-build

 cmake -DCMAKE_INSTALL_PREFIX=/usr \
    -DINSTALL_BINDIR=lib/qt6/bin \
    -DINSTALL_PUBLICBINDIR=usr/bin \
    -DINSTALL_LIBEXECDIR=lib/qt6 \
    -DINSTALL_DOCDIR=share/doc/qt6 \
    -DINSTALL_ARCHDATADIR=lib/qt6 \
    -DINSTALL_DATADIR=share/qt6 \
    -DINSTALL_INCLUDEDIR=include/qt6 \
    -DINSTALL_MKSPECSDIR=lib/qt6/mkspecs \
    -DINSTALL_EXAMPLESDIR=share/doc/qt6/examples \
    -DFEATURE_journald=ON \
    -DFEATURE_openssl_linked=ON \
    -DFEATURE_system_sqlite=ON \
    -DFEATURE_system_xcb_xinput=ON \
    -DFEATURE_no_direct_extern_access=ON \
    -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON \
    -DCMAKE_MESSAGE_LOG_LEVEL=STATUS  \
    -G Ninja ..

Keith Hedger · 05-30-2023, 04:17 AM

but does it install the pkg config files?

arch-linq · 05-31-2023, 02:29 AM

Lots of them in /usr/lib/pkgconfig.

Keith Hedger · 05-31-2023, 06:36 AM

well tried manually building the only dif is setting jounld to off but that is onky for logging also setting webengine to off and wayland to off which should not affect pkgconfig files but still no pc files.
are u actually building on LFS > or on arch the arch pkg list says pc files are installed, tried setting the install to /usr makes no difference.
i'm stumped

bryan_S · 05-31-2023, 12:57 PM

I've built qt 6.5.0 (need to upgrade to 6.5.1) on a current LFS system and can verify the pkgconfig files are installed. I'm using (mostly) the same build options as arch-linq, but I'm doing a modular build, not a monolithic build like you are doing. At least with qt6-base (haven't checked the other modules) it installed 13 .pc files in the 'standard location' /usr/lib/pkgconfig. Okay - I check qt6-tools. It installed 5 .pc files in the same location.

Is this a multilib system or regular? Why do you need lib${LIBDIRSUFFIX}? LFS puts libs in lib/.

Keith Hedger · 06-01-2023, 05:32 AM

Well fixed it, although qt6 built fine ( no build errors ) there is a stupid test in one file here:
qtbase-everywhere-src-6.5.1/cmake/QtPkgConfigHelpers.cmake

Which tests for shared libs and unix but really stupidly also tests the cmake version and fails if its too low ( I have tested building the pc files with a lower cmake version by commenting out the test, and it works fine ), no warnings no logging whats the point of putting the version test there, anyway the fix is to upgrade cmake wich I did and all is now working as expected, so for anyone else upgrade cmake >= 3.20
Marking as solved

bryan_S · 06-02-2023, 06:09 AM

Glad you got it tracked down. Qt6 build system played a 'trick' on me as well. With my CPU i can build my complete system with -march=bdver2 in CFLAGS (it's an AMD 'piledriver' CPU). Only with Qt6, the build stops right away and i had to switch to -march=x86_64-v2. Using -march=native didn't work either.