Make `PosixSource.h` installed and under `rts/`

is used outside of the rts so we do this rather than just fish it out of
the repo in ad-hoc way, in order to make packages in this repo more
self-contained.

1 files changed, 38 insertions, 0 deletions

diff --git a/includes/rts/PosixSource.h b/includes/rts/PosixSource.h
new file mode 100644
index 0000000000..13fd7b0ff5
--- /dev/null
+++ b/includes/rts/PosixSource.h
@@ -0,0 +1,38 @@
+/* -----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team, 1998-2005
+ *
+ * Include this file into sources which should not need any non-Posix services.
+ * That includes most RTS C sources.
+ * ---------------------------------------------------------------------------*/
+
+#pragma once
+
+#include <ghcplatform.h>
+
+/* We aim for C99 so we need to define following two defines in a consistent way
+   with what POSIX/XOPEN provide for C99. Some OSes are particularly picky about
+   the right versions defined here, e.g. Solaris
+   We also settle on lowest version of POSIX/XOPEN needed for proper C99 support
+   here which is POSIX.1-2001 compilation and Open Group Technical Standard,
+   Issue 6 (XPG6). XPG6 itself is a result of the merge of X/Open and POSIX
+   specification. It is also referred as IEEE Std. 1003.1-2001 or ISO/IEC
+   9945:2002 or UNIX 03 and SUSv3.
+   Please also see trac ticket #11757 for more information about switch
+   to C99/C11.
+
+   However, the use of `strnlen`, which is strictly speaking only available in
+   IEEE Std 1003.1-2008 (XPG7), requires lifting the bounds, to be able to
+   compile ghc on systems that are strict about enforcing the standard, e.g.
+   Apples mobile platforms.
+
+   Oracle's Solaris 11 supports only up to XPG6, hence the ifdef.
+  */
+
+#if defined(solaris2_HOST_OS)
+#define _POSIX_C_SOURCE 200112L
+#define _XOPEN_SOURCE   600
+#else
+#define _POSIX_C_SOURCE 200809L
+#define _XOPEN_SOURCE   700
+#endif