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Date: Fri, 14 Jun 2019 08:55:10 -0400 (EDT) From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com> To: Florian Weimer <fweimer@...hat.com> Cc: carlos <carlos@...hat.com>, Joseph Myers <joseph@...esourcery.com>, Szabolcs Nagy <szabolcs.nagy@....com>, libc-alpha <libc-alpha@...rceware.org>, Thomas Gleixner <tglx@...utronix.de>, Ben Maurer <bmaurer@...com>, Peter Zijlstra <peterz@...radead.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Boqun Feng <boqun.feng@...il.com>, Will Deacon <will.deacon@....com>, Dave Watson <davejwatson@...com>, Paul Turner <pjt@...gle.com>, Rich Felker <dalias@...c.org>, linux-kernel <linux-kernel@...r.kernel.org>, linux-api <linux-api@...r.kernel.org> Subject: Re: [PATCH 1/5] glibc: Perform rseq(2) registration at C startup and thread creation (v10) ----- On Jun 14, 2019, at 1:35 PM, Florian Weimer fweimer@...hat.com wrote: > * Mathieu Desnoyers: > >> * Makefile: >> >> LIBCPATH=/home/efficios/glibc-test/lib >> KERNEL_HEADERS=/home/efficios/git/linux-percpu-dev/usr/include >> CFLAGS=-I${KERNEL_HEADERS} -L${LIBCPATH} -Wl,--rpath=${LIBCPATH} >> -Wl,--dynamic-linker=${LIBCPATH}/ld-linux-x86-64.so.2 >> >> all: >> gcc ${CFLAGS} -o a a.c >> gcc ${CFLAGS} -shared -fPIC -o s.so s.c > > For me, that does not correctly link against the built libc because the > system dynamic loader seeps into the link. I have the same issue. I tried adding "-B${LIBCPATH}" as well, but it did not seem to help. I still have this ldd output: ldd a ./a: /lib64/ld-linux-x86-64.so.2: version `GLIBC_2.30' not found (required by ./a) linux-vdso.so.1 (0x00007fffaa7e9000) libc.so.6 => /home/efficios/glibc-test/lib/libc.so.6 (0x00007fac5d479000) /home/efficios/glibc-test/lib/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 (0x00007fac5da33000) Still no luck there. Any idea what compiler/linker flag I am missing ? > >> specifically this commit: >> https://github.com/compudj/glibc-dev/commit/c49a286497d065a7fc00aafd846e6edce14f97fc > > This commit links __rseq_handled into libc.so.6 via rseq-sym.c, but does > not export it from there. Moving __rseq_handled to elf/dl-support.c and elf/rtld.c was part a commit on top. I've force-pushed on the dev branch, and the commit moving __rseq_handled to the dynamic linker it now appears as: https://github.com/compudj/glibc-dev/commit/f0d4e60e5d0ceb0c2642f99da5af61b6ad988531 Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
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