tree 6822c3f153c65c33f08ebfb5ee3e1915decacc2a
parent c0c0ef061f2aaf054c7a970f28961097e46661f3
author Douglas Gregor <dgregor@apple.com> 1239405045 +0000
committer Douglas Gregor <dgregor@apple.com> 1239405045 +0000

Compare the predefines buffer in the PCH file with the predefines
buffer generated for the current translation unit. If they are
different, complain and then ignore the PCH file. This effectively
checks for all compilation options that somehow would affect
preprocessor state (-D, -U, -include, the dreaded -imacros, etc.).

When we do accept the PCH file, throw away the contents of the
predefines buffer rather than parsing them, since all of the results
of that parsing are already stored in the PCH file. This eliminates
the ugliness with the redefinition of __builtin_va_list, among other
things.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68838 91177308-0d34-0410-b5e6-96231b3b80d8