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Add some notes on armhf

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This commit is contained in:
Ximin Luo 2016-07-23 20:08:23 +02:00
parent 2542b74146
commit 71df2d626d
1 changed files with 15 additions and 0 deletions
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debian/README.Debian vendored
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@ -92,3 +92,18 @@ WARNING: This does not work yet
#apt-get source --compile --host-architecture=$new_arch rustc
-- Angus Lees <gus@debian.org>, Sun, 1 Feb 2015 16:16:44 +1100
Other notes
-----------
Rust armv7-unknown-linux-gnueabihf requires a machine that supports NEON
instructions which includes *most* ARMv7 chips these days.
Unfortunately, Debian's armhf port is supposed to work on machines without
NEON, which in practise means we can't generate or use NEON code in our armhf
binaries. This includes all of Debian's current armhf buildds, which error
with "Illegal instruction" when using the upstream stage0 bootstrap compiler.
We're currently unsure of the best way forward on this. rustc does build and
run (with all tests passing) on the armhf porterbox harris.debian.org, which
does support NEON instructions.