util: introduce detect_os.h

Mostly copied from src/gallium/include/pipe/p_config.h, so I kept its
copyright and authorship.

Other than the obvious rename, the big difference is that these are
always defined, to be used as `#if DETECT_OS_LINUX`.

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>

diff --git a/src/util/detect_os.h b/src/util/detect_os.h
new file mode 100644 (file)
index 0000000..6506948
--- /dev/null
+++ b/src/util/detect_os.h
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: MIT */
+/* Copyright 2008 VMware, Inc. */
+
+/**
+ * Auto-detect the operating system family.
+ *
+ * See also:
+ * - http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
+ * - echo | gcc -dM -E - | sort
+ * - http://msdn.microsoft.com/en-us/library/b0084kay.aspx
+ *
+ * @author José Fonseca <jfonseca@vmware.com>
+ */
+
+#ifndef DETECT_OS_H
+#define DETECT_OS_H
+
+#if defined(__linux__)
+#define DETECT_OS_LINUX 1
+#define DETECT_OS_UNIX 1
+#endif
+
+/*
+ * Android defines __linux__, so DETECT_OS_LINUX and DETECT_OS_UNIX will
+ * also be defined.
+ */
+#if defined(ANDROID)
+#define DETECT_OS_ANDROID 1
+#endif
+
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#define DETECT_OS_FREEBSD 1
+#define DETECT_OS_BSD 1
+#define DETECT_OS_UNIX 1
+#endif
+
+#if defined(__OpenBSD__)
+#define DETECT_OS_OPENBSD 1
+#define DETECT_OS_BSD 1
+#define DETECT_OS_UNIX 1
+#endif
+
+#if defined(__NetBSD__)
+#define DETECT_OS_NETBSD 1
+#define DETECT_OS_BSD 1
+#define DETECT_OS_UNIX 1
+#endif
+
+#if defined(__DragonFly__)
+#define DETECT_OS_DRAGONFLY 1
+#define DETECT_OS_BSD 1
+#define DETECT_OS_UNIX 1
+#endif
+
+#if defined(__GNU__)
+#define DETECT_OS_HURD 1
+#define DETECT_OS_UNIX 1
+#endif
+
+#if defined(__sun)
+#define DETECT_OS_SOLARIS 1
+#define DETECT_OS_UNIX 1
+#endif
+
+#if defined(__APPLE__)
+#define DETECT_OS_APPLE 1
+#define DETECT_OS_UNIX 1
+#endif
+
+#if defined(_WIN32) || defined(WIN32)
+#define DETECT_OS_WINDOWS 1
+#endif
+
+#if defined(__HAIKU__)
+#define DETECT_OS_HAIKU 1
+#define DETECT_OS_UNIX 1
+#endif
+
+#if defined(__CYGWIN__)
+#define DETECT_OS_CYGWIN 1
+#define DETECT_OS_UNIX 1
+#endif
+
+
+/*
+ * Make sure DETECT_OS_* are always defined, so that they can be used with #if
+ */
+#ifndef DETECT_OS_ANDROID
+#define DETECT_OS_ANDROID 0
+#endif
+#ifndef DETECT_OS_APPLE
+#define DETECT_OS_APPLE 0
+#endif
+#ifndef DETECT_OS_BSD
+#define DETECT_OS_BSD 0
+#endif
+#ifndef DETECT_OS_CYGWIN
+#define DETECT_OS_CYGWIN 0
+#endif
+#ifndef DETECT_OS_DRAGONFLY
+#define DETECT_OS_DRAGONFLY 0
+#endif
+#ifndef DETECT_OS_FREEBSD
+#define DETECT_OS_FREEBSD 0
+#endif
+#ifndef DETECT_OS_HAIKU
+#define DETECT_OS_HAIKU 0
+#endif
+#ifndef DETECT_OS_HURD
+#define DETECT_OS_HURD 0
+#endif
+#ifndef DETECT_OS_LINUX
+#define DETECT_OS_LINUX 0
+#endif
+#ifndef DETECT_OS_NETBSD
+#define DETECT_OS_NETBSD 0
+#endif
+#ifndef DETECT_OS_OPENBSD
+#define DETECT_OS_OPENBSD 0
+#endif
+#ifndef DETECT_OS_SOLARIS
+#define DETECT_OS_SOLARIS 0
+#endif
+#ifndef DETECT_OS_UNIX
+#define DETECT_OS_UNIX 0
+#endif
+#ifndef DETECT_OS_WINDOWS
+#define DETECT_OS_WINDOWS 0
+#endif
+
+#endif /* DETECT_OS_H */