Date: Sun, 9 Aug 2020 14:37:42 +0200 From: =?UTF-8?B?VMSzbA==?= Coosemans <tijl@FreeBSD.org> To: Gleb Popov <arrowd@freebsd.org> Cc: Konstantin Belousov <kostikbel@gmail.com>, toolchain@freebsd.org Subject: Re: Undefined reference to __atomic_store_8 Message-ID: <20200809143742.430764e7@FreeBSD.org> In-Reply-To: <CALH631nqdHq02xYM4cnOaPhmB5L3O5TJyZiKVNrUJu7kHg0uFQ@mail.gmail.com> 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>
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On Sun, 9 Aug 2020 15:36:51 +0400 Gleb Popov <arrowd@freebsd.org> wrote: > On Sat, Aug 8, 2020 at 5:30 PM Konstantin Belousov <kostikbel@gmail.com> > wrote: >> For code generated by gcc or clang, yes. >> If the reference to the symbol was generated by ghc, then I do not know. > > This doesn't seem to work. > > The code referencing __atomic_load_n() is C and GHC buildsystem already > passes -march=i686. Still, the problem persists. > Interestingly, 12.1-RELEASE-p2 doesn't have this problem, but > 12.1-RELEASE-p7 does. > > What library provides these symbols when clang is used? And I'm a bit > obscured how -march flag can affect these symbols' visibility at all? There is no such library. i586 supports 64 bit atomic operations so the compiler should emit instructions for that instead of a function call. Check that *.o files that match "__atomic_load" are in fact built with -march. 12.1-RELEASE-p7 probably has a newer clang that fixed an issue where the compiler would always emit instructions, even for i386 and i486.
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