Mac OS: unable to build libprotobuf with libc++ and deployment target 10.7

[JakubBednar]

Hello,

I am trying to build libprotobuf for mac os x 10.7 using SDK for 10.9 with libc++. Here are my results so far:

1. Specifying CXXFLAGS="-mmacosx-version-min=10.9 -isysroot <path to 10.9 sdk>" ends with correct protobuf libraries linking only libc++

2. Specifying CXXFLAGS="-mmacosx-version-min=10.7 -isysroot <path to 10.9 sdk>" ends with incorrect protobuf libraries linking only libstdc++

3. Specifying CXXFLAGS="-mmacosx-version-min=10.7 -isysroot <path to 10.9 sdk> -stdlib=libc++" ends with compiler error when linking the libraries

4. Specifying CXXFLAGS="-mmacosx-version-min=10.7 -isysroot <path to 10.9 sdk> -stdlib=libc++" and LIBS=-lc++ ends with incorrect protobuf libraries linking both libc++ and libstdc++

I have tried with old protobuf 2.5.0 as well as new 3.3.0. Is there a way how to force the buildsystem to link only with libc++ with macosx-version-min set to 10.7?

Thanks a lot,

Jakub

[thomasvl]

When setting flags, are you doing it on the configure or the make?

For ObjC, we've got a wrapper script we use to build the protoc to use, so you might be able to steal some ideas from there.

[JakubBednar]

I was passing the options to configure. I am using the cpp version of protobuf source code packages so I can use configure directly without autogen.

I was trying to find a way how to tweak the linking during make, but was not able to. I think the problem is somewhere around the libtool wrapper you use for linking. It does not correctly propagate the -stdlib=libc++ option as I saw it being passed to compiler but not to linker.

[thomasvl]

@TeBoring sorry, I can't say I have any real experience sorting though the libtool/configure/automake side of things, I've done just the minimal work to get the conformance test building for ObjC.

I can help explain some of the macOS specific options the compiler can use, but getting them into the protobuf build is likely better handled by someone that knows that process.

[TeBoring]

@JakubBednar Do you still have problem?
I found this issue may be useful: nodejs/node-gyp#469
Besides, have you tried defining LDFLAGS="-mmacosx-version-min=10.7 in option 2?

[TeBoring]

Feel free to reopen if there is still problem.