Cross compile for ARM

[sachin chadha]

Hi,

I am trying to cross compile protocol buffers for ARM on a docker container (x86 Linux). I have a pre-compiled version of protoc and the container has only cross build tools installed with no host g++ / gcc available. During ./configure i see the following error:

checking whether we are using the GNU C++ compiler... (cached) yes

checking whether g++ accepts -g... yes

checking dependency style of g++... (cached) gcc3

checking how to run the C++ preprocessor... /lib/cpp

configure: error: in `protocol_buffer_3.3.0_arm_cross_compile/protobuf':

configure: error: C++ preprocessor "/lib/cpp" fails sanity check

See `config.log' for more details

Why do protocol buffer needs Host g++ ? Is it for gmock ? And can this be disabled somehow ?

Sachin

[Adam Cozzette]

The build ordinarily relies on the host g++ to build protoc. I believe you can work around this problem by running "./configure --with-protoc=<path to your prebuilt protoc>" and then the build will use the provided protoc and not attempt to build a new one.

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[sachin chadha]

No. That's not it. I was using a precompiled protoc but still it requires g++. Any other pointers ?

On Friday, 19 July 2019 18:25:24 UTC+2, Adam Cozzette wrote:

The build ordinarily relies on the host g++ to build protoc. I believe you can work around this problem by running "./configure --with-protoc=<path to your prebuilt protoc>" and then the build will use the provided protoc and not attempt to build a new one.

On Fri, Jul 19, 2019 at 1:41 AM sachin chadha <sachin...@gmail.com> wrote:

Hi,

I am trying to cross compile protocol buffers for ARM on a docker container (x86 Linux). I have a pre-compiled version of protoc and the container has only cross build tools installed with no host g++ / gcc available. During ./configure i see the following error:

checking whether we are using the GNU C++ compiler... (cached) yes

checking whether g++ accepts -g... yes

checking dependency style of g++... (cached) gcc3

checking how to run the C++ preprocessor... /lib/cpp

configure: error: in `protocol_buffer_3.3.0_arm_cross_compile/protobuf':

configure: error: C++ preprocessor "/lib/cpp" fails sanity check

See `config.log' for more details

Why do protocol buffer needs Host g++ ? Is it for gmock ? And can this be disabled somehow ?

Sachin

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