Date: Mon, 22 Aug 2016 09:21:44 +0100 From: David Chisnall <theraven@FreeBSD.org> To: Mark Millard <markmi@dsl-only.net> Cc: FreeBSD Toolchain <freebsd-toolchain@freebsd.org>, freebsd-arm <freebsd-arm@freebsd.org>, freebsd-stable@freebsd.org, FreeBSD Ports <freebsd-ports@freebsd.org> Subject: Re: Problems with our libgcc_s.so in base [FYI: armv6 C++/g++6 example under stable/11 -r304029] Message-ID: <C092CBD5-39DE-4E82-A7ED-6A65A3FA80FB@FreeBSD.org> In-Reply-To: <65040FD8-1CDF-4D39-9D8B-19480E23CD31@dsl-only.net> References: <65040FD8-1CDF-4D39-9D8B-19480E23CD31@dsl-only.net>
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--Apple-Mail=_E19F0EEC-3A77-456F-9729-D6DB9ED6362B Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 On 21 Aug 2016, at 22:23, Mark Millard <markmi@dsl-only.net> wrote: >=20 > On armv6 (an rpi2) C++ by itself can have /lib/libgcc_s.so.1 not being = sufficient, for example with g++6 being used:=20 >=20 >> # g++6 -std=3Dc++14 -O2 cpp_clocks_investigation.cpp >> # ldd a.out >> a.out: >> libstdc++.so.6 =3D> /usr/local/lib/gcc6/libstdc++.so.6 = (0x20100000) >> libm.so.5 =3D> /lib/libm.so.5 (0x20053000) >> libgcc_s.so.1 =3D> /lib/libgcc_s.so.1 (0x20076000) >> libc.so.7 =3D> /lib/libc.so.7 (0x20300000) >> # ./a.out >> /usr/local/lib/gcc6/libstdc++.so.6: Undefined symbol = "__aeabi_uldivmod" >=20 The problem appears to be that we=E2=80=99ve not imported (all of?) the = ARM-specific bits of compiler-rt. For example, this function is = provided upstream: = http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/builtins/arm/aea= bi_uldivmod.S?revision=3D273500&view=3Dmarkup David --Apple-Mail=_E19F0EEC-3A77-456F-9729-D6DB9ED6362B Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIK5jCCBPww ggPkoAMCAQICECJrrb9nBol9MHok/UZg/AYwDQYJKoZIhvcNAQELBQAwdTELMAkGA1UEBhMCSUwx FjAUBgNVBAoTDVN0YXJ0Q29tIEx0ZC4xKTAnBgNVBAsTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24g QXV0aG9yaXR5MSMwIQYDVQQDExpTdGFydENvbSBDbGFzcyAxIENsaWVudCBDQTAeFw0xNjA0MTkw OTI3NDJaFw0xNzA0MTkwOTI3NDJaMEQxHTAbBgNVBAMMFHRoZXJhdmVuQGZyZWVic2Qub3JnMSMw IQYJKoZIhvcNAQkBFhR0aGVyYXZlbkBmcmVlYnNkLm9yZzCCASIwDQYJKoZIhvcNAQEBBQADggEP ADCCAQoCggEBALsL5pEhrGjrswHVdMHWhgxb8ARKDYRePSqpDLmjJ40bpx+n1zrvIwjC2Vk2IpoD 04rg5Pog2IrhnX+Qk2NSXzBXWj2JAaTc9OtSeAY0BtgJYXONGONQbRKVy97QBdzd1SbMEzDrOgH5 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