Date: Wed, 8 Jul 2015 19:53:33 -0700 From: NGie Cooper <yaneurabeya@gmail.com> To: Dimitry Andric <dim@freebsd.org> Cc: 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: <CAGHfRMA%2BpybAf=snW_NdjyQ0Amnw%2Bz2aGEp8_F-eVKy9eqGRzg@mail.gmail.com> In-Reply-To: <F5CD87E5-92B5-4E87-8DAF-18F4510CD113@FreeBSD.org> 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>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, Jul 8, 2015 at 3:18 PM, Dimitry Andric <dim@freebsd.org> wrote: > Check whether the path starts with /usr/bin, maybe? Normally, you would > check for the existence of a random header in a configure script. But > from within a C source file, it's not that easy. > > That said, immintrin.h is available for all usable versions of clang, > and should be available in all versions of gcc >= 4.4 (at least, if I > read gcc's commit history correctly). And gcc in base is definitely not > 4.4. :-) $ cat ~/has_immintrin.c #include <sys/cdefs.h> #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" Sadly this macro wasn't added until gcc 5.x: https://gcc.gnu.org/gcc-5/changes.html Cheers, -NGie
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAGHfRMA%2BpybAf=snW_NdjyQ0Amnw%2Bz2aGEp8_F-eVKy9eqGRzg>