#8341: Incorrect LLVM dependency in Mesa
-------------------------+--------------------------
Reporter: Krejzi | Owner: blfs-book@…
Type: enhancement | Status: new
Priority: normal | Milestone: 7.11
Component: BOOK | Version: SVN
Severity: normal | Resolution:
Keywords: |
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Description changed by Krejzi:
Old description:
> Note on the Mesa page states that LLVM and elfutils are required for
> several drivers.
>
> That's not entirely true.
>
> LLVM only is required for r300 (not elfutils).
>
> Neither LLVM or elfutils are needed for r600 unless one uses
> --enable-r600-llvm-compiler or enables OpenCL, neither which is default
> in BLFS; Former switch shouldn't be done anyways, SB is superior to llvm
> compiler.
>
> {{{
> --enable-r600-llvm-compiler: Use this switch to enable an experimental
> R600 LLVM backend for graphics shaders which claims to speed up the
> driver.
> }}}
>
> This statement should be reworked/removed, as it's no longer true (it may
> have been at one period in the past).
>
> Both elfutils and LLVM are required only for radeonsi.
>
> And still, only LLVM, without AMDGPU target, is needed for swr/llvmpipe.
> If llvm is not present, llvmpipe won't be built, but softpipe will be
> (both are different swrast implementations).
>
> https://cgit.freedesktop.org/mesa/mesa/tree/configure.ac#n2409
>
> https://cgit.freedesktop.org/mesa/mesa/tree/configure.ac#n2318
New description:
Note on the Mesa page states that LLVM and elfutils are required for
several drivers.
That's not entirely true.
LLVM only is required for r300 (not elfutils), and it doesn't need the
AMDGPU target.
Neither LLVM or elfutils are needed for r600 unless one uses --enable-r600
-llvm-compiler or enables OpenCL, neither which is default in BLFS, and
OCL requires additional deps not in the book; Former switch shouldn't be
used anyways, SB is superior to llvm compiler.
{{{
--enable-r600-llvm-compiler: Use this switch to enable an experimental
R600 LLVM backend for graphics shaders which claims to speed up the
driver.
}}}
This statement should be reworked/removed, as it's no longer true (it may
have been at one period in the past).
Both elfutils and LLVM are required only for radeonsi.
And still, only LLVM, without AMDGPU target, is needed for swr/llvmpipe.
If llvm is not present, llvmpipe won't be built, but softpipe will be
(both are different swrast implementations).
https://cgit.freedesktop.org/mesa/mesa/tree/configure.ac#n2409
https://cgit.freedesktop.org/mesa/mesa/tree/configure.ac#n2318
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Ticket URL: <http://wiki.linuxfromscratch.org/blfs/ticket/8341#comment:2>
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