0c55d8b58186ba69fffc147cd02b174450dac578 depends: qt: Patch to remove dep on libX11 (Carl Dong)
222e6cc52075cf6f866ce4a2e5900f0d6358f903 gitignore: Actually pay attention to depends patches (Carl Dong)
65f8da08df601ac98bad6f638392343fd564c0b9 symbol-check: Disallow libX11-*.so.* shared libraries (Carl Dong)
924569914e6079763fd1692bed372ded2c63d685 depends: libXext isn't needed by anyone (Carl Dong)
689d3b4a030675b6de87a55463a8e155843293fb build-aux: Remove check for x11-xcb (Carl Dong)
aa53cb7a2f04a59a4722c662e67b7a6ec04e32b5 depends: libX11: Make package headers-only (Carl Dong)
9a01ab04e1125b37618266d7fd1c3a6e3bb7e3f8 depends: qt: Explicitly stop using Xlib/libX11 (Carl Dong)
1ec30b8fbe4a162d6e2e6a9711d83f1bafd9b645 depends: xproto is only directly needed by libXau (Carl Dong)
Pull request description:
Related to: #16150
We noticed that we could build QT without using XLib/libX11 as a library. XLib/libX11's headers are still used, and a minimal `configure.ac` has been added to eliminate overly-enthusiastic configure-time dependencies that aren't actually required to obtain the headers.
This also means that we eliminate XLib/libX11 as required shared libraries at runtime, which is desirable.
See commit messages for more details.
---
Reviewers: I am least sure about the minimal `configure.ac`, as I'm not too familiar with the autoconf syntax. Any improvements w/re robustness would be welcome.
ACKs for top commit:
theuni:
ACK 0c55d8b58186ba69fffc147cd02b174450dac578
fanquake:
ACK 0c55d8b58186ba69fffc147cd02b174450dac578
Tree-SHA512: 41f653a0f91bc0e0faac49713c0c6dfd8cb605f9c4e34eb75a790dd808ebf3e5c160f1dd40bc8fbc911ee718ea319313b526d63733c98ff62d8dffecb58caa01
See here for background: https://bugreports.qt.io/browse/QTBUG-34748
libxcb temporarily had an abi breakage which caused crashes when qt was
compiled against a non-compatible version. Building qt with -qt-xcb should have
shielded us from this issue, except that incompatible headers were used when
building qt's wrapper.
Make sure those headers aren't picked up by qt's build.
Details:
qt's build adds a wrapper around the xcb libs when -qt-xcb is used. This is
done to avoid having to link to a handful of different libs, which may not be
api/abi stable. This build depends on include-order, so that its files are
found before the real libxcb headers.
Our build (for other reasons related to qt's complicated build-system) injects
our prefix into CXXFLAGS. Because libxcb is found in this path, that reverses
the include-order, negating the purpose of the wrapper.
To fix, libxcb's includes are simply moved to a subdir. pkg-config ensures that
they're still found properly when needed.
To make things even more interesting, this behavior in qt's .pro files is broken:
INCLUDEPATH += $$QMAKE_CFLAGS_XCB
The INCLUDEPATH variable is processed by qmake which automatically prefixes each
entry with "-I". The QMAKE_CFLAGS_XCB variable comes from pkg-config and
already contains -I, making the path look like "-I-I/path/to/xcb/headers".
To work around that, CFLAGS/CXXFLAGS are used here rather than INCLUDEPATH.
