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Add information compilation instructions for support on ARM

This commit is contained in:
Ondřej Surý 2018-10-22 11:43:29 +02:00
parent 8ae6280165
commit b6368ffdad

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@ -67,3 +67,34 @@ These are platforms on which BIND is known *not* to build or run:
* Platforms that don't support IPv6 Advanced Socket API (RFC 3542)
* Platforms that don't support atomic operations (via compiler or library)
* Linux without NPTL (Native POSIX Thread Library)
## Platform quirks
### ARM
If the compilation ends with following error:
```
Error: selected processor does not support `yield' in ARM mode
```
You will need to set `-march` compiler option to `native`, so the compiler
recognizes `yield` assembler instruction. The proper way to set `-march=native`
would be to put it into `CFLAGS`, e.g. run `./configure` like this:
`CFLAGS="-march=native -Os -g" ./configure` plus your usual options.
If that doesn't work, you can enforce the minimum CPU and FPU (taken from Debian
armhf documentation):
* The lowest worthwhile CPU implementation is Armv7-A, therefore the recommended
build option is `-march=armv7-a`.
* FPU should be set at VFPv3-D16 as they represent the miminum specification of
the processors to support here, therefore the recommended build option is
`-mfpu=vfpv3-d16`.
The configure command should look like this:
```
CFLAGS="-march=armv7-a -mfpu=vfpv3-d16 -Os -g" ./configure
```