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llvm-project/clang/test/Frontend/dependency-gen-symlink.c

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Track skipped files in dependency scanning. It's possible for a header to be a symlink to another header. In this case both will be represented by clang::FileEntry with the same UID and they'll use the same clang::HeaderFileInfo. If you include both headers and use some single-inclusion mechanism like a header guard or #import, one header will get a FileChanged callback, and another FileSkipped. So that we get an accurate dependency file, we therefore need to also implement the FileSkipped callback in dependency scanning. Patch by Pete Cooper. Reviewers: bruno, pete Reviewed By: bruno Subscribers: cfe-commits, jkorous, vsapsai Differential Revision: https://reviews.llvm.org/D30881 llvm-svn: 331319
2018-05-02 07:59:33 +08:00
// REQUIRES: shell
// Basic test
// RUN: rm -rf %t.dir
// RUN: mkdir %t.dir
// RUN: mkdir %t.dir/a
// RUN: mkdir %t.dir/b
// RUN: echo "#ifndef HEADER_A" > %t.dir/a/header.h
// RUN: echo "#define HEADER_A" >> %t.dir/a/header.h
// RUN: echo "#endif" >> %t.dir/a/header.h
// RUN: ln -s %t.dir/a/header.h %t.dir/b/header.h
// RUN: %clang_cc1 -dependency-file %t.dir/file.deps -MT %s.o %s -fsyntax-only -I %t.dir -isystem %S/Inputs/SystemHeaderPrefix
// RUN: FileCheck -input-file=%t.dir/file.deps %s
// CHECK: dependency-gen-symlink.c.o
// CHECK: dependency-gen-symlink.c
// CHECK: a/header.h
// CHECK: b/header.h
// CHECK-NOT: with-header-guard.h
#include "a/header.h"
#include "b/header.h"
// System header shouldn't be included in dependencies.
#include <with-header-guard.h>
#include <with-header-guard.h>