Date: Wed, 13 Sep 2023 13:22:50 +0200 From: Jan Beich <jbeich@FreeBSD.org> To: Emmanuel Vadot <manu@bidouilliste.com> Cc: Gleb Popov <arrowd@freebsd.org>, "Tobias C. Berner" <tcberner@freebsd.org>, ports-committers@freebsd.org, dev-commits-ports-all@freebsd.org, dev-commits-ports-main@freebsd.org Subject: Re: git: 4df0e66a3662 - main - llvm.mk: add export/noexport to handle CC/CXX/CPP exports Message-ID: <zg1q-fhbp-wny@FreeBSD.org> In-Reply-To: <20230913102352.b641f29cd7cb76f2937d1a61@bidouilliste.com> (Emmanuel Vadot's message of "Wed, 13 Sep 2023 10:23:52 %2B0200") References: <202309130518.38D5INm2018105@gitrepo.freebsd.org> <CALH631mauenLxm13nmEo9SCyqGMu2yRJ9C-gjjJ9yS4Wg0L33g@mail.gmail.com> <20230913102352.b641f29cd7cb76f2937d1a61@bidouilliste.com>
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Emmanuel Vadot <manu@bidouilliste.com> writes: > On Wed, 13 Sep 2023 08:55:48 +0300 > Gleb Popov <arrowd@freebsd.org> wrote: > >> On Wed, Sep 13, 2023 at 8:20?AM Tobias C. Berner <tcberner@freebsd.org> wrote: >> > >> > + USES=llvm.mk now supports 'export' (default) and 'noexport' arguments. >> > + When export is set, CC, CXX and CPP will be set to the path corresponding >> > + to the chosen llvm-version. >> >> The choice for the default seems strange to me. Now every port that >> has USES=llvm will be switching to building with a non-base compiler. >> Is this really a sensible default? > > Isn't that what you want when you add USES=llvm ? Changing CC is USES=compiler job. Contributors starting using USES=llvm for changing Clang version because USES=compiler is poorly maintained. I predominantly add USES=llvm to satisfy libLLVM (mesa-devel, rpcs3) or libclang (USES=cargo + CARGO_CRATES=bindgen). In a few cases when I need newer Clang (for C++20 std:ranges, C++23) I also need newer libc++ but devel/llvm* maintainer refuses to provide libc++ (bug 260139). Forcing CC/CXX/CPP without testing all consumers has a chance of introducing regressions. For example, when using LTO it's important to make sure CMake doesn't pick up /usr/bin/llvm-ar or /usr/bin/llvm-ranlib because those may not support LLVM bitcode used by devel/llvm*. https://cgit.freebsd.org/ports/commit/?id=5e71e4d45129 https://cgit.freebsd.org/ports/commit/?id=2ce01a07d7c9 While the affected ports had LTO enabled by default there's also WITH_LTO knob handled by /usr/ports/Mk/Features/lto.mk.
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