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