llvm-project/clang/test/Modules/Inputs/explicit-build/c.h

#include "b.h"

#if !__building_module(c)
#error "should only get here when building module c"
#endif

const int c = 3;
[modules] Initial support for explicitly loading .pcm files. Implicit module builds are not well-suited to a lot of build systems. In particular, they fare badly in distributed build systems, and they lead to build artifacts that are not tracked as part of the usual dependency management process. This change allows explicitly-built module files (which are already supported through the -emit-module flag) to be explicitly loaded into a build, allowing build systems to opt to manage module builds and dependencies themselves. This is only the first step in supporting such configurations, and it should be considered experimental and subject to change or removal for now. llvm-svn: 220359 2014-10-22 10:05:46 +08:00			`#include "b.h"`

			`#if !__building_module(c)`
			`#error "should only get here when building module c"`
			`#endif`

			`const int c = 3;`