llvm-project/clang/test/Modules/modify-module.m

// Test that if we modify one of the input files used to form a
// header, that module and dependent modules get rebuilt.

// RUN: rm -rf %t
// RUN: mkdir -p %t/include
// RUN: cp %S/Inputs/Modified/A.h %t/include
// RUN: cp %S/Inputs/Modified/B.h %t/include
// RUN: cp %S/Inputs/Modified/module.map %t/include
// RUN: %clang_cc1 -fdisable-module-hash -fmodules-cache-path=%t/cache -fmodules -fimplicit-module-maps -I %t/include %s -verify
// RUN: echo '' >> %t/include/B.h
// RUN: %clang_cc1 -fdisable-module-hash -fmodules-cache-path=%t/cache -fmodules -fimplicit-module-maps -I %t/include %s -verify
// RUN: echo 'int getA(); int getA2();' > %t/include/A.h
// RUN: %clang_cc1 -fdisable-module-hash -fmodules-cache-path=%t/cache -fmodules -fimplicit-module-maps -I %t/include %s -verify
// RUN: rm %t/cache/ModA.pcm
// RUN: %clang_cc1 -fdisable-module-hash -fmodules-cache-path=%t/cache -fmodules -fimplicit-module-maps -I %t/include %s -verify
// RUN: touch %t/cache/ModA.pcm
// RUN: %clang_cc1 -fdisable-module-hash -fmodules-cache-path=%t/cache -fmodules -fimplicit-module-maps -I %t/include %s -verify

// expected-no-diagnostics

// FIXME: It is intended to suppress this on win32.
// REQUIRES: ansi-escape-sequences

@import ModB;

int getValue() { return getA() + getB(); }