The sources generated by protoc do not vary by platform... protoc isn't a cross-compiler itself, it's just a source code generator.
The goal would be to get the protoc binary for your build environment, and use it to generate the sources to feed into your host/target platform. In other words, you'll need to build the protobuf suite once to get `protoc` for the builder. Then, you'll use that `protoc` to build a second time for the target. If you are using the autoconf-based build, you can pass `--with-protoc` to the configure script to point to pick the correct protoc binary to use. I was able to do this using two build trees. The "-build" tree is x86-64, and targets the builder: ~/protobuf-2.6.0-build$ (./autogen.sh && ./configure && make -j32) >& make.log Then, use that to build for ppc: ~/protobuf-2.6.0-build$ PROTOC=$PWD/src/protoc ~/protobuf-2.6.0-build$ cd ../protobuf-2.6.0 ~/protobuf-2.6.0$ (./autogen.sh && ./configure --with-protoc=$PROTOC --host=powerpc-linux-gnu && make -j32) >& make.log ~/protobuf-2.6.0$ readelf -h src/.libs/libprotobuf.so.9.0.0 ELF Header: Magic: 7f 45 4c 46 01 02 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement, big endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: DYN (Shared object file) Machine: PowerPC (etc.) (Of course, you can install the x86-64 build if you want, but I would recommend keeping it separate. Version 2.6.0 is really old, so you wouldn't want to use it for new projects.) On Friday, April 24, 2020 at 6:17:49 AM UTC-7, kerry crouse wrote: > > If I run the PowerPC cross compiler and create a Protoc with it, that > Protoc will only run on a PowerPC. I am trying to set up the PowerPC > Protobuf files, the .pb.cc files, on the x86 build machine to cross compile > the image for the PowerPC machine. Is not the cross compiled Protoc meant > to run directly on the PowerPC machine? > > On Thursday, April 23, 2020 at 1:36:40 PM UTC-4, kerry crouse wrote: >> >> I have been through the online documentation, readmes, and protoc help >> and I'm missing how to do this: generate big endian protobuf code on little >> endian machine. Can someone point me to a howto? My build machine is a >> Linux Debian x86 machine. My target machine is a 32 bit PowerPC device. >> Thanks! >> > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to protobuf+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/protobuf/e9937bb5-caab-4d3f-b244-e7efe631b86d%40googlegroups.com.
