Date: Thu, 9 Jul 2015 09:44:03 +0100 From: David Chisnall <theraven@FreeBSD.org> To: NGie Cooper <yaneurabeya@gmail.com> Cc: Dimitry Andric <dim@freebsd.org>, Adrian Chadd <adrian.chadd@gmail.com>, Pedro Giffuni <pfg@freebsd.org>, Luigi Rizzo <luigi@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org> Subject: Re: svn commit: r285284 - head/lib/liblzma Message-ID: <E1605BA4-DBE6-4F7B-BC5E-15E78671DF9B@FreeBSD.org> In-Reply-To: <CAGHfRMA%2BpybAf=snW_NdjyQ0Amnw%2Bz2aGEp8_F-eVKy9eqGRzg@mail.gmail.com> References: <201507081836.t68IacJu069563@repo.freebsd.org> <559D9172.9040305@FreeBSD.org> <CAJ-Vmo=m0Y%2BE0oi5ec5RzyziqObOj=fKY1K-8HzqK8x7D_TcKg@mail.gmail.com> <F5CD87E5-92B5-4E87-8DAF-18F4510CD113@FreeBSD.org> <CAGHfRMA%2BpybAf=snW_NdjyQ0Amnw%2Bz2aGEp8_F-eVKy9eqGRzg@mail.gmail.com>
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On 9 Jul 2015, at 03:53, NGie Cooper <yaneurabeya@gmail.com> wrote: >=20 > $ cat ~/has_immintrin.c > #include <sys/cdefs.h> >=20 > #if __has_include(<immintrin.h>) > #error "I have immintrin.h" > #else > #error "I don't have immintrin.h" > #endif > $ clang -c ~/has_immintrin.c > /home/ngie/has_immintrin.c:4:2: error: "I have immintrin.h" > #error "I have immintrin.h" > ^ > 1 error generated. > $ gcc -c ~/has_immintrin.c > /home/ngie/has_immintrin.c:6:2: error: #error "I don't have = immintrin.h" >=20 > Sadly this macro wasn't added until gcc 5.x: > https://gcc.gnu.org/gcc-5/changes.html cdefs.h defines __has_include(x) to 0 if the compiler does not provide = __has_include(), so this will also work with gcc in base (always = claiming not to have immintrin.h). David
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