[R-SIG-Mac] build R for macOS with binary compatibility with CRAN

[Balamuta, James Joseph]

Simon,

This is great! Thank you for sharing. I think I noticed a bug with the fixpathR script: clang4 complier is hard coded.

https://svn.r-project.org/R-dev-web/trunk/QA/Simon/R-build/fixpathR

Instances:

    find . -name \*.dylib -or -name \*.so| xargs -n 1 install_name_tool -change /usr/local/clang4/lib/$gcclib $R/lib/$gcclib

and

	install_name_tool -change /usr/local/clang4/lib/$gcclib $R/lib/$gcclib $rbin

Could this be the reason for the ABI issues we're having with clang7?

Best,

JJB

On 1/9/20, 8:52 PM, "R-SIG-Mac on behalf of Simon Urbanek" <r-sig-mac-bounces using r-project.org on behalf of simon.urbanek using R-project.org> wrote:

    Jonathon,
    
    when you build R it requires the compiler runtime libraries from /usr/local. We don't want to require users to install compilers just to run R, so we supply copies of those runtime libraries in the lib directory.
    You can replicate the way CRAN R is built using the CRAN build scripts in https://svn.r-project.org/R-dev-web/trunk/QA/Simon/R-build
    
    There is a lot going on and there are many special cases for all the compiler generations we were using over the years, but I think the main part to look at for what you refer to is
    https://svn.r-project.org/R-dev-web/trunk/QA/Simon/R-build/fixpathR
    
    Cheers,
    Simon
    
    
    
    > On Jan 9, 2020, at 5:38 PM, Jonathon Love <jon using thon.cc> wrote:
    > 
    > hi,
    > 
    > i've successfully built R for macOS, and it all works well, however i'm wanting to achieve compatibility with the prebuilt .tgz CRAN R packages.
    > 
    > the compatibility issue i've been having is that the R produced lacks the Resources/lib/libc++.1.dylib. the prebuilt CRAN R packages link to this, and can't find it at runtime.
    > 
    > i'm wondering where this file (and a few other files in Resources/lib) that ship with the official CRAN R binary come from - because i don't think they're from the build process of R.
    > 
    > it looks like the official binary is subject to a few additional build steps (copying binaries in, etc.)?
    > 
    > with thanks
    > 
    > jonathon
    > 
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