Date: Tue, 11 Aug 2020 15:56:35 +0400 From: Gleb Popov <arrowd@freebsd.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: =?UTF-8?Q?T=C4=B3l_Coosemans?= <tijl@freebsd.org>, toolchain@freebsd.org Subject: Re: Undefined reference to __atomic_store_8 Message-ID: <CALH631=7M6J3L7AzgHqEwtyBo6f-9SPM4w3PDAULUACVwJMVyg@mail.gmail.com> In-Reply-To: <20200809154312.GH2551@kib.kiev.ua> References: <CALH631msD2jEwaH2ejzdE5RCYd=CA2GYV-o-%2BfC6sPSskXdkTg@mail.gmail.com> <20200807212855.GB2551@kib.kiev.ua> <CALH631=FxoEdp_akV-szxTuLVrZ4oFgHWKcWJNOGEuLwqJ3Hyw@mail.gmail.com> <20200808133000.GC2551@kib.kiev.ua> <CALH631nqdHq02xYM4cnOaPhmB5L3O5TJyZiKVNrUJu7kHg0uFQ@mail.gmail.com> <20200809143742.430764e7@FreeBSD.org> <20200809154312.GH2551@kib.kiev.ua>
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On Sun, Aug 9, 2020 at 7:43 PM Konstantin Belousov <kostikbel@gmail.com> wrote: > I do not believe there were any change in the toolchain between p2 and p7, > this is more likely indicates some fluctuation in the build. The only > change that could be even remotely declared as possibly related is > EN-20:10.build r360473. > Right, I was using a wrong set of port's OPTIONS that hide the problem. Indeed you need to look at the .o files that reference _8 symbol. I would > closely look at the compilation command used for them, for start. > After digging it a bit I found that the following command cc -x c /wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/libraries/ghc-prim/cbits/atomic.c -o /tmp/ghc_1.s -fno-PIC -Wimplicit -S \ -include /wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/includes/dist-install/build/ghcversion.h -I/usr/local/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/libraries/base/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/libraries/base/dist-install/build/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/libraries/base/dist-install/build/dist-install/build/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/libraries/integer-gmp/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/libraries/integer-gmp/dist-install/build/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/libraries/integer-gmp/dist-install/build/dist-install/build/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/rts/dist/build -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/includes \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/includes/dist-derivedconstants/header \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/includes/dist-install/build \ -march=i686 -U__i686 produce an assembly file with calll __atomic_load_8 instruction. The value of -march flag seems to be ignored. Interestingly, previous version of GHC calls C compiler in the following way: cc -U__i686 '-march=i686' -fno-stack-protector -DTABLES_NEXT_TO_CODE '-march=i686' -x c /wrkdirs/usr/ports/lang/ghc/work/ghc-8.10.1/libraries/ghc-prim/cbits/atomic.c -o /tmp/ghc_1.s -Wimplicit -S \ -include /wrkdirs/usr/ports/lang/ghc/work/ghc-8.6.5-boot/lib/ghc-8.6.5/include/ghcversion.h \ -I/usr/local/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.6.5-boot/lib/ghc-8.6.5/base-4.12.0.0/include \ -I/wrkdirs/usr/ports/lang/ghc/work/ghc-8.6.5-boot/lib/ghc-8.6.5/include And this command produces an assembly without calls to __atomic_load_8 Any ideas what makes it appear?
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