Rename include/fenv.h to <openlibm_fenv.h>.

OpenLibm has an implementation of fenv.h internally. This may be
problematic in case you want it to build against the host system's
implementation, as it would require you to somehow take the fenv.h file
out of the compiler search path.

Simply use a different naming scheme, similar to openlibm.h and
openlibm_complex.h. If we want to build against the host's fenv.h, we
can simply add an '#include <fenv.h>' from within this header.

Author: EdSchouten

amd64/fenv.c

@@ -32,7 +32,7 @@
 #ifdef _WIN32
 #define __fenv_static
 #endif
-#include "fenv.h"
+#include "openlibm_fenv.h"
 
 #ifdef __GNUC_GNU_INLINE__
 #error "This file must be compiled with C99 'inline' semantics"

amd64/fenv.h

@@ -29,8 +29,10 @@
 #ifndef	_FENV_H_
 #define	_FENV_H_
 
-#include "include/cdefs-compat.h"
-#include "include/types-compat.h"
+#include "cdefs-compat.h"
+#include "types-compat.h"
+
+#include "math_private.h"
 
 #ifndef	__fenv_static
 #define	__fenv_static	static

arm/fenv.c

@@ -27,7 +27,7 @@
  */
 
 #define	__fenv_static
-#include "fenv.h"
+#include <openlibm_fenv.h>
 
 #ifdef __GNUC_GNU_INLINE__
 #error "This file must be compiled with C99 'inline' semantics"

i387/fenv.c

@@ -32,7 +32,7 @@
 #include <i387/bsd_npx.h>
 
 #define	__fenv_static
-#include "fenv.h"
+#include <openlibm_fenv.h>
 
 #ifdef __GNUC_GNU_INLINE__
 #error "This file must be compiled with C99 'inline' semantics"

include/fenv.h

@@ -27,11 +27,11 @@
 #include "cdefs-compat.h"
 //__FBSDID("$FreeBSD: src/lib/msun/src/e_sqrtl.c,v 1.1 2008/03/02 01:47:58 das Exp $");
 
-#include <fenv.h>
 #include <float.h>
 
 #include "fpmath.h"
 #include "openlibm.h"
+#include "openlibm_fenv.h"
 #include "math_private.h"
 
 /* Return (x + ulp) for normal positive x. Assumes no overflow. */

src/e_sqrtl.c

@@ -0,0 +1,9 @@
+#if defined(__arm__)
+#include "../arm/fenv.h"
+#elif defined(__x86_64__)
+#include "../amd64/fenv.h"
+#elif defined(__i386__)
+#include "../i387/fenv.h"
+#else
+#error "Unsupported platform"
+#endif

src/openlibm_fenv.h

@@ -27,9 +27,9 @@
 #include "cdefs-compat.h"
 //__FBSDID("$FreeBSD: src/lib/msun/src/s_fma.c,v 1.8 2011/10/21 06:30:43 das Exp $");
 
-#include <fenv.h>
 #include <float.h>
 #include <openlibm.h>
+#include <openlibm_fenv.h>
 
 #include "math_private.h"
 

src/s_fma.c

@@ -27,9 +27,8 @@
 #include "cdefs-compat.h"
 //__FBSDID("$FreeBSD: src/lib/msun/src/s_fmaf.c,v 1.3 2011/10/15 04:16:58 das Exp $");
 
-#include <fenv.h>
-
 #include "openlibm.h"
+#include "openlibm_fenv.h"
 #include "math_private.h"
 
 /*

src/s_fmaf.c

@@ -27,9 +27,9 @@
 #include "cdefs-compat.h"
 //__FBSDID("$FreeBSD: src/lib/msun/src/s_fmal.c,v 1.7 2011/10/21 06:30:43 das Exp $");
 
-#include <fenv.h>
 #include <float.h>
 #include <openlibm.h>
+#include <openlibm_fenv.h>
 #include "math_private.h"
 #include "fpmath.h"