commit: 6d9336278643e0ad9fc99cfd497d50c3a8f30319 Author: Sam James <sam <AT> gentoo <DOT> org> AuthorDate: Sat Nov 30 02:59:57 2024 +0000 Commit: Sam James <sam <AT> gentoo <DOT> org> CommitDate: Sat Nov 30 05:10:29 2024 +0000 URL: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=6d933627
toolchain.eclass: wire up offloading for nvptx 'crossdev -t nvptx-none' creates a standalone cross-compiler which is needed anyway, but by itself, it's less useful than offloading support within host gcc, where GCC can choose to offload into that cross-compiler as appropriate. This could include amdgcn-amdhsa support in the future. Bug: https://bugs.gentoo.org/945296 Signed-off-by: Sam James <sam <AT> gentoo.org> eclass/toolchain.eclass | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass index bcc47ffb9635..5b68c5acbc49 100644 --- a/eclass/toolchain.eclass +++ b/eclass/toolchain.eclass @@ -1312,8 +1312,30 @@ toolchain_src_configure() { ;; nvptx*) needed_libc=newlib - # "LTO is not supported for this target" - confgcc+=( --disable-lto ) + confgcc+=( + # "LTO is not supported for this target" + --disable-lto + ) + + # --enable-as-accelerator-for= seems to disable + # installing nvtpx-none-cc etc, so we have to + # avoid passing that for the stage1-build that + # crossdev does. If we pass it unconditionally, + # we can't build newlib after building stage1 gcc. + if has_version ${CATEGORY}/${PN} ; then + confgcc+=( + # It's unlikely that anyone will want + # to build nvptx-none as a pure standalone + # toolchain (which will be single-threaded, etc). + # + # If someone really wants it, we can see about + # adding a USE=offload or similar based on CTARGET + # for cross targets. But for now, we always assume + # we're being built as an offloading compiler (accelerator). + --enable-as-accelerator-for=${CHOST} + --disable-sjlj-exceptions + ) + fi ;; esac @@ -1547,6 +1569,12 @@ toolchain_src_configure() { [[ ${CTARGET} == *-darwin* ]] && \ confgcc+=( --enable-version-specific-runtime-libs ) + # TODO: amdgcn-amdhsa? + [[ ${CTARGET} == x86_64* ]] && confgcc+=( + --enable-offload-defaulted + --enable-offload-targets=nvptx-none + ) + ### library options if in_iuse openmp ; then
