Date: Sun, 10 Feb 2019 11:24:32 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Mark Millard <marklmi@yahoo.com> Cc: Dimitry Andric <dim@freebsd.org>, freebsd-toolchain@freebsd.org Subject: Re: clang broken on current? Message-ID: <20190210192432.GA35876@troutmask.apl.washington.edu> In-Reply-To: <59881520-AB59-49C3-810F-C0676C3B037C@yahoo.com> References: <20190210050003.GA31811@troutmask.apl.washington.edu> <F26ACA01-4132-4020-8089-FB862347F37E@FreeBSD.org> <20190210184656.GD35569@troutmask.apl.washington.edu> <59881520-AB59-49C3-810F-C0676C3B037C@yahoo.com>
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On Sun, Feb 10, 2019 at 11:13:09AM -0800, Mark Millard wrote: > > On 2019-Feb-10, at 10:46, Steve Kargl <sgk at troutmask.apl.washington.edu> wrote: > > > > On Sun, Feb 10, 2019 at 12:03:55PM +0100, Dimitry Andric wrote: > >> On 10 Feb 2019, at 06:00, Steve Kargl <sgk at troutmask.apl.washington.edu> wrote: > >> > >> How did you arrive at the conclusion that this has anything to do with > >> the specific compiler? From these errors, I think it is more likely > >> something in Qt5 that is erroneously convinced that those qt_memfillXY > >> functions exist. Or they get referenced, but not compiled at all, for > >> some reason. > >> > > > > If I have "CFLAGS+= -march=i686 -mmmx -msse" in /etc/make.conf > > qt5-gui builds without issue. If I add -msse2 to CFLAGS, then > > the build dies. > > > > So, either clang is miscompiling qt5-gui with -mmse2 or the > > qt5-gui port is being too smart for its own good. > > That lead to an old memory of getting results like ((armv6 > time frame I think, before the armv7 addition to FreeBSD): > > image/qimage.cpp:(.text+0x1e14): undefined reference to `qt_memfill32(unsigned int*, unsigned int, int)' > image/qimage.cpp:(.text+0x1f34): undefined reference to `qt_memfill32(unsigned int*, unsigned int, int)' > > where it turned out that arm NEON was not supported by various > parts of qt5. > It is definitely some problem between clang and the qt5-gui port. It seems qt5-gui tries to auto-detect sse2. Don't know if qt5-gui has a bogus auto-detect code, clang miscompiles the auto-detect code, or FreeBSD is lying about the features of my cpu (although x86info says it found sse2). In poking around the qt5-gui sources, I found that configure can be given a -sse2 argument. I tried to force sse2, but I'm seeing qt5-gui is doing % find qtbase-everywhere-src-5.12.0 -name config.\* | xargs grep -i sse2 qtbase-everywhere-src-5.12.0/config.log:Command line: -no-eglfs -sse2 -no-evdev -no-libudev -system-harfbuzz -c++std c++14 -opensource -confirm-license -no-pch -prefix /usr/local -bindir /usr/local/lib/qt5/bin -headerdir /usr/local/include/qt5 -libdir /usr/local/lib/qt5 -plugindir /usr/local/lib/qt5/plugins -importdir /usr/local/lib/qt5/imports -datadir /usr/local/share/qt5 -docdir /usr/local/share/doc/qt5 -translationdir /usr/local/share/qt5/translations -sysconfdir /usr/local/etc/xdg -nomake examples -nomake tests -platform freebsd-clang -archdatadir /usr/local/lib/qt5 -libexecdir /usr/local/libexec/qt5 -qmldir /usr/local/lib/qt5/qml -examplesdir /usr/local/share/examples/qt5 -testsdir /usr/local/share/qt5/tests -no-sse2 -no-use-gold-linker -recheck-all -release -no-separate-debug-info qtbase-everywhere-src-5.12.0/config.opt:-sse2 qtbase-everywhere-src-5.12.0/config.opt:-no-sse2 Note my -sse2 is followed by a -no-sse2! -- Steve 20170425 https://www.youtube.com/watch?v=VWUpyCsUKR4 20161221 https://www.youtube.com/watch?v=IbCHE-hONow
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