clang/test/Modules/no-undeclared-includes-builtins.cpp

   1 // Test that a [no_undeclared_headers] module can include builtin headers, even
   2 // if these have been "claimed" by a different module that wraps these builtin
   3 // headers. libc++ does this, for example.
   4 //
   5 // The test inputs used here replicates the relationship between libc++ and
   6 // glibc. When modularizing glibc, [no_undeclared_headers] must be used to
   7 // prevent glibc from including the libc++ versions of the C standard library
   8 // headers.
   9
  10 // RUN: rm -rf %t
  11 // RUN: %clang_cc1 -fmodules-cache-path=%t -fmodules -fbuiltin-headers-in-system-modules -fimplicit-module-maps -I %S/Inputs/no-undeclared-includes-builtins/libcxx -I %S/Inputs/no-undeclared-includes-builtins/glibc %s
  12 // expected-no-diagnostics
  13
  14 #include <stddef.h>