test/Frontend/stdin-input.c - llvm-project/clang - Git at Google

 // RUN: cat %s | %clang -emit-llvm -g -S \
 // RUN: -Xclang -main-file-name -Xclang test/foo.c -x c - -o - | FileCheck %s
 // CHECK: ; ModuleID = 'test/foo.c'
 // CHECK: source_filename = "test/foo.c"
 // CHECK: !DIFile(filename: "test/foo.c"

 int main(void) {}
	// RUN: cat %s \| %clang -emit-llvm -g -S \
	// RUN: -Xclang -main-file-name -Xclang test/foo.c -x c - -o - \| FileCheck %s
	// CHECK: ; ModuleID = 'test/foo.c'
	// CHECK: source_filename = "test/foo.c"
	// CHECK: !DIFile(filename: "test/foo.c"

	int main(void) {}