tree f8344b43af355c090cd78a7248742c53bbb2e86c
parent 29ae2ba6563a9b74bedc9dfd0c5214722e008caa
author Shoaib Meenai <smeenai@fb.com> 1507159032 +0000
committer Shoaib Meenai <smeenai@fb.com> 1507159032 +0000

[libc++] Add site config option for ABI macros

Some ABI macros affect headers, so it's nice to have a site config
option for them. Add a LIBCXX_ABI_DEFINES cmake macro to allow
specifying a list of ABI macros to define in the site config.

The primary design constraint (as discussed with Eric on IRC a while
back) was to not have to repeat the ABI macro names in cmake, which only
leaves a free-form cmake list as an option. A somewhat unfortunate
consequence is that we can't verify that the ABI macros being defined
actually exist, though we can at least perform some basic sanity
checking, since all the ABI macros begin with _LIBCPP_ABI_.

Differential Revision: https://reviews.llvm.org/D36719

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@314946 91177308-0d34-0410-b5e6-96231b3b80d8