[PATCH] ieeefp.c: Compute _LDBL_EQ_DBL in sys/config.h [v2]

[Keith Packard]

Do this instead of computing it at configure time to avoid having a
compiler-option-specific value installed in newlib.h on a multilib
system.

v2:
Move test to sys/config.h which should always get included
whereever this is needed in both the library and applications
using the library.

Signed-off-by: Keith Packard <***@keithp.com>
---
newlib/libc/include/math.h | 2 +-
newlib/libc/include/sys/config.h | 10 ++++++++++
2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/newlib/libc/include/math.h b/newlib/libc/include/math.h
index 893a5d064..e60b8e7f4 100644
--- a/newlib/libc/include/math.h
+++ b/newlib/libc/include/math.h
@@ -4,7 +4,7 @@

#include <sys/reent.h>
#include <sys/cdefs.h>
-#include <machine/ieeefp.h>
+#include <ieeefp.h>
#include "_ansi.h"

_BEGIN_STD_C
diff --git a/newlib/libc/include/sys/config.h b/newlib/libc/include/sys/config.h
index 2082dfdb1..407d214e8 100644
--- a/newlib/libc/include/sys/config.h
+++ b/newlib/libc/include/sys/config.h
@@ -3,6 +3,7 @@

#include <machine/ieeefp.h> /* floating point macros */
#include <sys/features.h> /* POSIX defs */
+#include <float.h>

#ifdef __aarch64__
#define MALLOC_ALIGNMENT 16
@@ -297,4 +298,13 @@
#define _MB_EXTENDED_CHARSETS_WINDOWS 1
#endif

+/* Figure out if long double is the same size as double. If the system
+ * doesn't provide long double, then those values will be undefined
+ * and cpp will substitute 0 for them in the test
+ */
+#if LDBL_MANT_DIG == DBL_MANT_DIG && LDBL_MIN_EXP == DBL_MIN_EXP && \
+ LDBL_MAX_EXP == DBL_MAX_EXP
+#define _LDBL_EQ_DBL
+#endif
+
#endif /* __SYS_CONFIG_H__ */