Date: Sun, 16 Apr 2017 21:32:25 -0700 From: Mark Millard <markmi@dsl-only.net> To: Ed Maste <emaste@freebsd.org> Cc: FreeBSD Toolchain <freebsd-toolchain@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org>, FreeBSD Ports <freebsd-ports@freebsd.org> Subject: Re: FYI: amd64 built with WITH_LLD_IS_LD= vs. devel/libunwind : cannot preempt symbol (for various symbols) Message-ID: <6C9833F3-8DA6-4D79-A076-F4B78C47CC72@dsl-only.net> In-Reply-To: <CAPyFy2C3vrDm5L_6k_2bY_12wH5oHN62EuB2HzMKTE7cVzPmKw@mail.gmail.com> References: <37CB2849-A509-4C1D-AB93-A1FBFF70E959@dsl-only.net> <CAPyFy2C3vrDm5L_6k_2bY_12wH5oHN62EuB2HzMKTE7cVzPmKw@mail.gmail.com>
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On 2017-Apr-16, at 7:01 PM, Ed Maste <emaste@freebsd.org> wrote: > On 16 April 2017 at 04:10, Mark Millard <markmi@dsl-only.net> wrote: >> Context: amd64 FreeBSD -r316952 as a VirtualBox guest >> that was built using WITH_LLD_IS_LD=3D . ports -r438577. >>=20 >> x11/xorg-minimal indirectly gets to devel/libunwind and >> devel/libunwind fails to build from source: >>=20 >>=20 >> --- Lperf-simple --- >> libtool: link: cc -O2 -pipe -g -fstack-protector -fno-strict-aliasing = -fexceptions -Wall -Wsign-compare -fstack-protector -o = .libs/Lperf-simple Lperf-simple.o ../src/.libs/libunwind.so -lgcc = -llzma -Wl,-rpath -Wl,/usr/local/lib >> /usr/bin/ld: error: ./Gperf-simple.c:195: cannot preempt symbol = '_ULx86_64_init_local' defined in ../src/.libs/libunwind.so >=20 > The LLD ports exp-run identified the "cannot preempt symbol" issue as > being responsible for the largest number of failed or skipped ports. > You can find a description of the issue in LLVM PR 30960 > (https://bugs.llvm.org//show_bug.cgi?id=3D30960). This is a tricky > issue, and one for which there's not a clear right answer, but is > arguably a problem that needs to be addressed in the individual pieces > of software (libunwind, openal-soft, etc.) Good to know. > As a temporary workaround you can add CFLAGS+=3D -fPIC to the port's > Makefile, as in > = https://github.com/emaste/freebsd-ports/commit/4857444b31ca546e29e221dce2a= 41092765e6062 I've set this up for the next time I try using WITH_LLD_IS_LD=3D on amd64. Thanks. When I reverted earlier to binutils based ld a later qt5-widgets vs. libQt5Core.so ended up with: "multiple definition of" for __bss_start@Qt_5 _edata@Qt_5 _end@Qt_5 and this stoped the build that I was attempting. (I did not make to to the x11/lumina that I explicitly specified as to be built.) So my -fPIC experiment using WITH_LLD_IS_LD=3D on amd64 will not likely happen until Qt5 can build what is involved in its supporting x11/lumina . (Having at least x11/xorg-minimal also helps with using x11/lumina . But until I can have x11/lumina I've no intended use for x11/xorg-minimal .) =3D=3D=3D Mark Millard markmi at dsl-only.net
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