Please review the inlined news item. I'd like to publish it when LLVM-3.9 is unmasked.
-- Title: LLVM 3.9 with LLVM_TARGETS Author: Michał Górny <mgo...@gentoo.org> Content-Type: text/plain Posted: 2016-..-.. Revision: 1 News-Item-Format: 1.0 Display-If-Installed: <sys-devel/llvm-3.9 The newest release of LLVM 3.9 has undergone major Gentoo changes, and may require explicit action prior to the upgrade. In this release, the semi-implicit target choice has been replaced with an explicit LLVM_TARGETS flag set. If you did not enable USE=multitarget, no action should be required. The targets for your host CPU, Berkeley Packet Filter (used by some packages) and possibly two major GPUs (AMDGPU and NVPTX) will be enabled by default which is a superset of the previous default. However, you may want to disable some of those targets if you do not intend to install packages requiring them (dev-util/bcc, dev-libs/libclc). If you enabled USE=multitarget, you will now need to specify all the requested targets explicitly. The old flag will be preserved for some time for compatibility reasons; however, it will only enforce explicitly selecting all targets. In order to enable all targets, add the following to your /etc/portage/package.use or equivalent file: sys-devel/llvm LLVM_TARGETS: * sys-devel/clang LLVM_TARGETS: * If you had to use USE=multitarget to enable some of the targets you needed, you can now disable the flag and specify those targets explicitly. Please also note that starting with LLVM-4.0, sys-devel/clang will be built as a separate package and the enabled LLVM_TARGETS for that package will actually enforce requested targets. Setting LLVM_TARGETS globally is discouraged as it can cause bootstrap issues with sys-libs/compiler-rt in the future. -- Best regards, Michał Górny <http://dev.gentoo.org/~mgorny/>
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