Merge remote-tracking branch 'origin/master' into glibcxx_wchar_strea…

…ms_workaround

README.md

@@ -397,6 +397,10 @@ The `CMakeLists.txt` offers a few options to customize its behavior:
   `CMAKE_CXX_COMPILE_FEATURES` when the detection of C++17 or C++20 for additional tests
   is not working (e.g. `cxx_std_20` to enforce building a `filesystem_test_cpp20` with C++20).
 
+### Bazel
+
+Please use [hedronvision/bazel-cc-filesystem-backport](https://github.com/hedronvision/bazel-cc-filesystem-backport), which will automatically set everything up for you.
+
 ### Versioning
 
 There is a version macro `GHC_FILESYSTEM_VERSION` defined in case future changes

include/ghc/filesystem.hpp

@@ -3431,6 +3431,9 @@ GHC_INLINE path path::lexically_relative(const path& base) const
             --count;
         }
     }
+    if (count == 0 && (a == end() || a->empty())) {
+        return path(".");
+    }
     if (count < 0) {
         return path();
     }
@@ -4099,7 +4102,7 @@ GHC_INLINE bool copy_file(const path& from, const path& to, copy_options options
     }
     ssize_t br, bw;
     while (true) {
-        do { br = ::read(in, buffer.data(), buffer.size()); } while(errno == EINTR);
+        do { br = ::read(in, buffer.data(), buffer.size()); } while(errno == EINTR && !br);
         if(!br) {
             break;
         }
@@ -5818,7 +5821,7 @@ class directory_iterator::impl
         , _entry(nullptr)
     {
         if (!path.empty()) {
-            do { _dir = ::opendir(path.native().c_str()); } while(errno == EINTR);
+            do { _dir = ::opendir(path.native().c_str()); } while(errno == EINTR && !_dir);
             if (!_dir) {
                 auto error = errno;
                 _base = filesystem::path();
@@ -5845,7 +5848,7 @@ class directory_iterator::impl
             do {
                 skip = false;
                 errno = 0;
-                do { _entry = ::readdir(_dir); } while(errno == EINTR);
+                do { _entry = ::readdir(_dir); } while(errno == EINTR && !_entry);
                 if (_entry) {
                     _dir_entry._path = _base;
                     _dir_entry._path.append_name(_entry->d_name);

test/filesystem_test.cpp

@@ -965,6 +965,10 @@ TEST_CASE("fs.path.gen - path generation", "[filesystem][path][fs.path.gen]")
     // lexically_relative()
     CHECK(fs::path("/a/d").lexically_relative("/a/b/c") == "../../d");
     CHECK(fs::path("/a/b/c").lexically_relative("/a/d") == "../b/c");
+    CHECK(fs::path("/a/b/c").lexically_relative("/a/b/c/d/..") == ".");
+    CHECK(fs::path("/a/b/c/").lexically_relative("/a/b/c/d/..") == ".");
+    CHECK(fs::path("").lexically_relative("/a/..") == "");
+    CHECK(fs::path("").lexically_relative("a/..") == ".");
     CHECK(fs::path("a/b/c").lexically_relative("a") == "b/c");
     CHECK(fs::path("a/b/c").lexically_relative("a/b/c/x/y") == "../..");
     CHECK(fs::path("a/b/c").lexically_relative("a/b/c") == ".");