Date: Sat, 21 Jul 2018 22:11:19 +0300 From: Yuri Pankov <yuripv@yuripv.net> To: Julian Elischer <julian@freebsd.org>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: gcc/clang interoperability problem with a custom "samba" build in recent -current. Message-ID: <3dd60a0d-7a5e-e9f0-3018-d09b5b8ac389@yuripv.net> In-Reply-To: <c77253cd-3fca-a3a6-2f98-73ecb8c656bc@yuripv.net> References: <abe47622-ba13-7c3f-9ddd-51c9fd3c40cd@freebsd.org> <bd0ad5d1-76ce-28b0-3813-4c11a82cd27d@freebsd.org> <c77253cd-3fca-a3a6-2f98-73ecb8c656bc@yuripv.net>
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Yuri Pankov wrote: > Julian Elischer wrote: >> I would really like ot get some pointers as to who are our tools >> committers at the moment, in particular who might know about these issues. >> The main issue for me at the moment is the ability to compile the >> aesni code in Samba from clang.. >> >> Julian >> >> >> On 20/7/18 7:32 pm, Julian Elischer wrote: >>> compiling our samba with gcc 4.2.1 in 12 gave us some off behaviour >>> when lld became the linker I think.. >>> >>> 1/ linking needed some directories added to some of the build >>> scripts because previously apparently it looked in $SYSROOT/usr/lib >>> by default and now it doesn't. >>> >>> 2/ compiling our samba produces a libtdb.so that has various symbols >>> in it, (according to nm(1) ), but when we try link against it we get >>> complaints about those symbols not being defined. >>> >>> 3/ an attempt to switch to using clang to compile everything leads to: >>> >>> >>> "--aes-accel=intelaesni selected and compiler rejects -Wp,-E,-lang-asm. >>> >>> One wonders whether there is a clang equivalent of "-Wp,-E,-lang-asm" >>> >>> The AES acceleration is a configure option for the samba package. >>> >>> Apparently turning it on requires -Wp,-E,-lang-asm. >>> >>> which apparently gcc 4.2.1 has, but clang doesn't have. >>> >>> FreeBSD clang version 6.0.1 (tags/RELEASE_601/final 335540) (based >>> on LLVM 6.0.1) >>> Target: x86_64-unknown-freebsd12.0 >>> Thread model: posix >>> InstalledDir: /usr/bin >>> >>> anyone know if there is a clang equivalent of -Wp, -E,-lang-asm? > > In later GCC versions the cpp's -lang-asm seems to be deprecated in > favor of -x assembler-with-cpp as it conflicts with -l option. > > Could you try changing the -Wp,-E,-lang-asm to -Wp,-E,-xassembler-with-cpp? Just tried it myself, and if you indeed mean the third_party/aesni-intel/aesni-intel_asm.c, the following seems to work for me: clang -xassembler-with-cpp -c third_party/aesni-intel/aesni-intel_asm.c >>> possible work arrounds include: >>> >>> 1/ Get gcc/lld to produce a library from which lld can find the symbols >>> >>> 2/ find a way to compile this with clang but everything else with gcc? >>> >>> 3/ find a way to allow clang to use >>> -Wp,-E,-lang-asm >>> >>> whatever that means >>> >>> >>> Thoughts from any tools people?
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