clang/test/Modules/declare-use-private-textual.cpp

// RUN: rm -rf %t
// RUN: split-file %s %t
// RUN: %clang_cc1 -fimplicit-module-maps -fmodules-cache-path=%t -fmodules-strict-decluse -fmodule-name=lib_Private -I %t %t/lib.cpp -verify

//--- module.modulemap
// This simulates a modulemap that might reasonably be generated by a build system for something resembling the following.
// This can be used to perform strict dependency checking to ensure that your build graph is correctly declared.
// cc_library(
//   name = "lib",
//   # .cpp file in sources -> generate a compilation action with -fmodule-name=lib_Private
//   # .h file in sources -> "textual header" in private modulemap
//   sources = ["lib.cpp"],
//   # headers -> "textual header" in public modulemap
//   headers = ["lib.h"],
//   # implementation_dep -> "use" in private modulemap
//   implementation_deps = [":impl_dep"]
//   # dep -> "use" in private and public modulemap
//   deps = [":direct"],
// )
// cc_library(name = "direct", headers = ["direct.h"], deps = [":indirect"], ...)
// cc_library(name = "indirect", headers = ["indirect.h"], ..)
// cc_library(name = "impl_dep", headers = ["impl_dep.h"], ...)
module lib_Private {
  use impl_dep
  use lib
  use direct
}

module lib {
  textual header "lib.h"
  use direct
}


module impl_dep {
  textual header "impl_dep.h"
}

module direct {
  textual header "direct.h"
  use indirect
}

module indirect {
  textual header "indirect.h"
}

//--- impl_dep.h
void impl_dep();
//--- direct.h
#include "impl_dep.h" // OK (it should only verify the main module).
void direct();
//--- indirect.h
void indirect();
//--- not_module.h
void not_module();

//--- lib.cpp
#include "lib.h"
#include "direct.h" // OK
#include "indirect.h" // expected-error {{module lib_Private does not directly depend on a module exporting 'indirect.h', which is part of indirectly-used module indirect}}
#include "impl_dep.h" // OK
#include "not_module.h" // expected-error {{module lib_Private does not depend on a module exporting 'not_module.h'}}

//--- lib.h
#include "direct.h" // OK
#include "indirect.h"  // expected-error {{module lib does not directly depend on a module exporting 'indirect.h', which is part of indirectly-used module indirect}}
#include "impl_dep.h"  // expected-error {{module lib does not depend on a module exporting 'impl_dep.h', which is part of module impl_dep, although its private module does}}
#include "not_module.h" // expected-error {{module lib does not depend on a module exporting 'not_module.h'}}