[Buildroot] [PATCH] package/protobuf: uses fork(), not available on no-MMU platforms
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Sat Aug 27 13:12:11 UTC 2016
Hello,
On Sat, 27 Aug 2016 02:17:03 +0200, Jörg Krause wrote:
> Propagate the dependency to the packages mosh and ola.
>
> Fixes:
> http://autobuild.buildroot.net/results/2c1/2c151e84d7854a810465dc16869023e0ada2d586/
>
> Signed-off-by: Jörg Krause <joerg.krause at embedded.rocks>
At first, I was a bit surprised as to why we're seeing this only now,
so I investigated a bit, and came to the following conclusion, which I
added to the commit log:
"""
This was not noticed until now because:
1/ The older Blackfin toolchain doesn't have libatomic, so it didn't
provide the atomic operations that protobuf needs, so protobuf was
never built.
2/ The ARM Cortex-M toolchain is static-only, and protobuf requires
dynamic library support.
So it's only with the new Blackfin toolchain, which is based on gcc
6.x (and therefore provides libatomic) and is FDPIC-based (and therefore
has dynamic library support) that this problem appeared.
"""
> diff --git a/package/protobuf/Config.in b/package/protobuf/Config.in
> index 3215a07..4a8d1ef 100644
> --- a/package/protobuf/Config.in
> +++ b/package/protobuf/Config.in
> @@ -33,6 +33,7 @@ config BR2_PACKAGE_PROTOBUF
> depends on BR2_INSTALL_LIBSTDCPP
> depends on BR2_TOOLCHAIN_HAS_THREADS
> depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS
> + depends on BR2_USE_MMU # fork()
> depends on !BR2_STATIC_LIBS
> help
> Protocol buffers are Google's language-neutral, platform-neutral,
When you add a new dependency, you must also propagate it to the
Config.in comment so that those comments don't appear on no-MMU
platforms.
*However*, in this specific case, there was already a
BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS, to which it makes a lot of sense to
add the BR2_USE_MMU dependency: it's an architecture dependency, and by
doing so, it's automatically propagated to the existing comments and
reverse dependencies.
Applied with those changes. Thanks!
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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