[libcxx-commits] [libcxx] c7d46f2 - [libcxx] Use the allocating form of getcwd() on Glibc and Apple platforms

[Martin Storsjö via libcxx-commits]

Author: Martin Storsjö
Date: 2021-02-26T00:14:12+02:00
New Revision: c7d46f221e829411b0f0dec41409ed626646cdd2

URL: https://github.com/llvm/llvm-project/commit/c7d46f221e829411b0f0dec41409ed626646cdd2
DIFF: https://github.com/llvm/llvm-project/commit/c7d46f221e829411b0f0dec41409ed626646cdd2.diff

LOG: [libcxx] Use the allocating form of getcwd() on Glibc and Apple platforms

This avoids having to query pathconf for a max size for
preallocating a buffer for the return value.

This is an extension to the POSIX getcwd() spec.

Differential Revision: https://reviews.llvm.org/D97460

Added: 
    

Modified: 
    libcxx/src/filesystem/operations.cpp

Removed: 
    


################################################################################
diff  --git a/libcxx/src/filesystem/operations.cpp b/libcxx/src/filesystem/operations.cpp
index d0f0d5b99159..06efb722e054 100644
--- a/libcxx/src/filesystem/operations.cpp
+++ b/libcxx/src/filesystem/operations.cpp
@@ -1095,7 +1095,7 @@ void __create_symlink(path const& from, path const& to, error_code* ec) {
 path __current_path(error_code* ec) {
   ErrorHandler<path> err("current_path", ec);
 
-#if defined(_LIBCPP_WIN32API)
+#if defined(_LIBCPP_WIN32API) || defined(__GLIBC__) || defined(__APPLE__)
   // Common extension outside of POSIX getcwd() spec, without needing to
   // preallocate a buffer. Also supported by a number of other POSIX libcs.
   int size = 0;