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authorChris Metcalf <cmetcalf@ezchip.com>2015-12-01 14:59:38 -0500
committerChris Metcalf <cmetcalf@ezchip.com>2015-12-03 13:00:46 -0500
commite59c94fa0e2871bdfcc363899e3be376c0def770 (patch)
tree4073066d0031614fe8947c997354d0d3758f6602 /sysdeps/arm
parentb3f6040781f78af648fc90f67cec3e49a338b3e9 (diff)
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math: add LDBL_CLASSIFY_COMPAT support
If a platform does not define "long-double-fcts = yes" in its
Makefiles and it does define __NO_LONG_DOUBLE_MATH in its installed
headers, it will currently create exported symbols for __finitel,
__isinfl, and __isnanl that can't be reached from userspace by
correct use of the finite(), isinf(), or isnan() macros in <math.h>.

To avoid this situation, by default for such platforms we now no
longer export these symbols, thus causing appropriate link-time
errors.  However, for platforms that previously exported these
symbols, we continue to do so as compat symbols; this is enabled
by adding LDBL_CLASSIFY_COMPAT to math_private.h for the platform.

For tile, remove the now-unnecessary exports of those functions from
libc and libm.
Diffstat (limited to 'sysdeps/arm')
-rw-r--r--sysdeps/arm/math_private.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/arm/math_private.h b/sysdeps/arm/math_private.h
index c175b15601..d39e9ee24a 100644
--- a/sysdeps/arm/math_private.h
+++ b/sysdeps/arm/math_private.h
@@ -1,6 +1,10 @@
 #ifndef ARM_MATH_PRIVATE_H
 #define ARM_MATH_PRIVATE_H 1
 
+/* Enable __finitel, __isinfl, and __isnanl for binary compatibility
+   when built without long double support. */
+#define LDBL_CLASSIFY_COMPAT 1
+
 #include "fenv_private.h"
 #include_next <math_private.h>