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 -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> 15