Make std::experimental::filesystem::remove and remove_all return false or 0 if the file doesn't exist

Differential Revision: https://reviews.llvm.org/D41830

llvm-svn: 322293

libcxx/src/experimental/filesystem/operations.cpp

@@ -661,8 +661,10 @@ path __read_symlink(const path& p, std::error_code *ec) {
 
 bool __remove(const path& p, std::error_code *ec) {
     if (ec) ec->clear();
+
     if (::remove(p.c_str()) == -1) {
-        set_or_throw(ec, "remove", p);
+        if (errno != ENOENT)
+            set_or_throw(ec, "remove", p);
         return false;
     }
     return true;
@@ -692,13 +694,18 @@ std::uintmax_t remove_all_impl(path const & p, std::error_code& ec)
 } // end namespace
 
 std::uintmax_t __remove_all(const path& p, std::error_code *ec) {
+    if (ec) ec->clear();
+
     std::error_code mec;
     auto count = remove_all_impl(p, mec);
     if (mec) {
-        set_or_throw(mec, ec, "remove_all", p);
-        return static_cast<std::uintmax_t>(-1);
+        if (mec == errc::no_such_file_or_directory) {
+            return 0;
+        } else {
+            set_or_throw(mec, ec, "remove_all", p);
+            return static_cast<std::uintmax_t>(-1);
+        }
     }
-    if (ec) ec->clear();
     return count;
 }
 

libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.remove/remove.pass.cpp

@@ -61,17 +61,29 @@ TEST_CASE(test_error_reporting)
     const path file_in_bad_dir = env.create_file(bad_perms_dir / "file", 42);
     permissions(bad_perms_dir, perms::none);
     const path testCases[] = {
-        "",
-        env.make_env_path("dne"),
         non_empty_dir,
         file_in_bad_dir,
     };
     for (auto& p : testCases) {
         std::error_code ec;
+
         TEST_CHECK(!fs::remove(p, ec));
         TEST_CHECK(ec);
         TEST_CHECK(checkThrow(p, ec));
     }
+
+    // PR#35780
+    const path testCasesNonexistant[] = {
+        "",
+        env.make_env_path("dne")
+    };
+
+    for (auto& p : testCasesNonexistant) {
+        std::error_code ec;
+
+        TEST_CHECK(!fs::remove(p, ec));
+        TEST_CHECK(!ec);
+    }
 }
 
 TEST_CASE(basic_remove_test)

libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp

@@ -64,16 +64,28 @@ TEST_CASE(test_error_reporting)
     permissions(bad_perms_file, perms::none);
 
     const path testCases[] = {
-        env.make_env_path("dne"),
         file_in_bad_dir
     };
     const auto BadRet = static_cast<std::uintmax_t>(-1);
     for (auto& p : testCases) {
         std::error_code ec;
+
         TEST_CHECK(fs::remove_all(p, ec) == BadRet);
         TEST_CHECK(ec);
         TEST_CHECK(checkThrow(p, ec));
     }
+
+    // PR#35780
+    const path testCasesNonexistant[] = {
+        "",
+        env.make_env_path("dne")
+    };
+    for (auto &p : testCasesNonexistant) {
+        std::error_code ec;
+
+        TEST_CHECK(fs::remove_all(p) == 0);
+        TEST_CHECK(!ec);
+    }
 }
 
 TEST_CASE(basic_remove_all_test)