libstdc++: Define _GNU_SOURCE for secure_getenv on Cygwin [PR104217]

For GNU/Linux G++ defines _GNU_SOURCE automatically, but not for Cygwin.
This means secure_getenv is not declared by Cygwin's <stdlib.h>, even
though autoconf detected it is present in the library. Define it in the
source files that want to use secure_getenv.

libstdc++-v3/ChangeLog:

	PR libstdc++/104217
	* src/c++17/fs_ops.cc (_GNU_SOURCE): Define.
	* src/filesystem/dir.cc (_GNU_SOURCE): Define.
	* src/filesystem/ops.cc (_GNU_SOURCE): Define.

diff --git a/libstdc++-v3/src/c++17/fs_ops.cc b/libstdc++-v3/src/c++17/fs_ops.cc
index 1d3693a..321944d 100644 (file)
--- a/libstdc++-v3/src/c++17/fs_ops.cc
+++ b/libstdc++-v3/src/c++17/fs_ops.cc
@@ -27,6 +27,10 @@
 # define NEED_DO_COPY_FILE
 # define NEED_DO_SPACE
 #endif
+#ifndef _GNU_SOURCE
+// Cygwin needs this for secure_getenv
+# define _GNU_SOURCE 1
+#endif
 
 #include <bits/largefile-config.h>
 #include <filesystem>

diff --git a/libstdc++-v3/src/filesystem/dir.cc b/libstdc++-v3/src/filesystem/dir.cc
index f1bf96a..d5b11f2 100644 (file)
--- a/libstdc++-v3/src/filesystem/dir.cc
+++ b/libstdc++-v3/src/filesystem/dir.cc
@@ -25,6 +25,10 @@
 #ifndef _GLIBCXX_USE_CXX11_ABI
 # define _GLIBCXX_USE_CXX11_ABI 1
 #endif
+#ifndef _GNU_SOURCE
+// Cygwin needs this for secure_getenv
+# define _GNU_SOURCE 1
+#endif
 
 #include <bits/largefile-config.h>
 #include <experimental/filesystem>

diff --git a/libstdc++-v3/src/filesystem/ops.cc b/libstdc++-v3/src/filesystem/ops.cc
index 324c6af..cd98caf 100644 (file)
--- a/libstdc++-v3/src/filesystem/ops.cc
+++ b/libstdc++-v3/src/filesystem/ops.cc
@@ -27,6 +27,10 @@
 # define NEED_DO_COPY_FILE
 # define NEED_DO_SPACE
 #endif
+#ifndef _GNU_SOURCE
+// Cygwin needs this for secure_getenv
+# define _GNU_SOURCE 1
+#endif
 
 #include <bits/largefile-config.h>
 #include <experimental/filesystem>