[Buildroot] [Bug 14461] New: Qt5webenegine does not build due to fontconfig/freetype dependency problem

[Buildroot] [Bug 14461] New: Qt5webenegine does not build due to fontconfig/freetype dependency problem

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14461

            Bug ID: 14461
           Summary: Qt5webenegine does not build due to
                    fontconfig/freetype dependency problem
           Product: buildroot
           Version: 2021.08.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Other
          Assignee: unassigned@buildroot.uclibc.org
          Reporter: wojciech.ziniewicz@gmail.com
                CC: buildroot@uclibc.org
  Target Milestone: ---

Hello,
I'm experiencing the same qt5 webengine build problem on x86 64 bit
architecture with following combinations of gcc and buildroot:
- gcc8, gcc9, gcc10
- 2021.08.2, 2021.08.3, 2021.11

It seems that qt5webengine requires freetype2.pc file which exists (parallel to
other .pc files). Both pkg config/fontconfig and freetype are normally
available.
The freetype/fontconfig pair is compiled prior to qt5webengine and it does not
really matter whether I explicitly add them to the config file or not because
they are included via FONTCONFIG dependency in qt5webengine.


-------------------------------- the error:
ERROR at //build/config/linux/pkg_config.gni:103:17: Script returned non-zero
exit code.
    pkgresult = exec_script(pkg_config_script, args, "value")
                ^----------
Current dir:
/common_cache/nerves/artifacts/rzjb_system_dev-portable-1.1.0/build/qt5webengine-5.15.2/src/core/release/
Command:
/common_cache/nerves/artifacts/rzjb_system_dev-portable-1.1.0/host/bin/python2
/common_cache/nerves/artifacts/rzjb_system_dev-portable-1.1.0/build/qt5webengine-5.15.2/src/3rdparty/chromium/build/config/linux/pkg-config.py
-p
/common_cache/nerves/artifacts/rzjb_system_dev-portable-1.1.0/build/qt5webengine-5.15.2/host-bin/host-pkg-config
freetype2
Returned 1.
stderr:
Package freetype2 was not found in the pkg-config search path.
Perhaps you should add the directory containing `freetype2.pc'
to the PKG_CONFIG_PATH environment variable
Package 'freetype2', required by 'virtual:world', not found
Could not run pkg-config.
See //build/linux/BUILD.gn:24:3: whence it was called.
  pkg_config("freetype_from_pkgconfig") {
  ^--------------------------------------
See //build/config/freetype/BUILD.gn:10:24: which caused the file to be
included.
    public_configs = [ "//build/linux:freetype_from_pkgconfig" ]
                       ^--------------------------------------
Project ERROR: GN run error!
make[4]: *** [Makefile:82: sub-gn_run-pro-make_first] Error 3
make[3]: *** [Makefile:79: sub-core-make_first] Error 2
make[2]: *** [Makefile:49: sub-src-make_first] Error 2
make[1]: *** [package/pkg-generic.mk:270:
/common_cache/nerves/artifacts/rzjb_system_dev-portable-1.1.0/build/qt5webengine-5.15.2/.stamp_built]
Error 2
make: *** [Makefile:23: _all] Error 2
--------------

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[Buildroot] [Bug 14461] Qt5webenegine does not build due to fontconfig/freetype dependency problem

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14461

--- Comment #1 from Peter Seiderer <ps.report@gmx.net> ---
Known problem, see [1], [2], and [3] for workaround/hack for solving it (and
[4] for more discussion of the problem)...

[1] https://bugs.busybox.net/show_bug.cgi?id=12131

[2] https://bugs.busybox.net/show_bug.cgi?id=11776

[3] http://lists.busybox.net/pipermail/buildroot/2020-December/601542.html

[4] http://lists.busybox.net/pipermail/buildroot/2021-January/301496.html

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[Buildroot] [Bug 14461] Qt5webenegine does not build due to fontconfig/freetype dependency problem

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14461

--- Comment #2 from Wojciech Ziniewicz <wojciech.ziniewicz@gmail.com> ---
Hello Peter - thank you for the response. I think it still leads me to nowwhere
but your memory of the issues is impressive.

[1] describes a problem that looks similar but it refers to problem with
stdlib.h while I'm having a problem with pkg-config / freetype
[2] the problem from this one was already patched and I confirmed I'm using a
patched version with QMAKE_ISYSTEM set to blank string
[3] this problem is _exactly_ what I'm seeing but still - the fix is in the
main branch and I also explicitly added the `BR2_PACKAGE_QT5BASE_FONTCONFIG` in
addition to the fact that qt5webengine requires is as a dependency itself now
[4] this is exeactly what I've done (actually my change is unnecessary as these
dependencies are automatically sucked in after the changes)

So basically even after I explicitly add the deps for fontconfig, I still get
the error.

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[Buildroot] [Bug 14461] Qt5webenegine does not build due to fontconfig/freetype dependency problem

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14461

--- Comment #3 from Peter Seiderer <ps.report@gmx.net> ---
(In reply to Wojciech Ziniewicz from comment #2)

I am pretty sure patch [3] is not in mainline ;-),
the trick is not the enabling of the target fontconfig/libjepeg but to
force host-fontconfig/host-libjpeg to be available to fullfill the
qt5webengine host-pkg-search for all/some libs enabled only for the target...

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[Buildroot] [Bug 14461] Qt5webenegine does not build due to fontconfig/freetype dependency problem

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14461

--- Comment #4 from Peter Seiderer <ps.report@gmx.net> ---
(In reply to Peter Seiderer from comment #3)

And finally the corresponding patchwork link [5]...

[5]
https://patchwork.ozlabs.org/project/buildroot/patch/20201221203952.22168-3-ps.report@gmx.net/

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[Buildroot] [Bug 14461] Qt5webenegine does not build due to fontconfig/freetype dependency problem

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14461

--- Comment #5 from Wojciech Ziniewicz <wojciech.ziniewicz@gmail.com> ---
Wonderful - Peter - let me try to use that in my build system and get back with
comments.

What are the chances these patches are included in the mainline?

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