[Buildroot] [PATCH] ruby: assume we always have finite, isinf and isnan for uClibc

[Vicente Olivert Riera]

uClibc has __finite, __isinf and __isnan, and Ruby's configure script
checks for finite, isinf and isnan (note the missing leading __).
Because of the naming difference the checks fail, therefore the symbols
HAVE_FINITE, HAVE_ISINF and HAVE_ISNAN are not defined.
Ruby code relies on those symbols in order to define its own version of
the finite, isinf and isnan functions. Since the symbols haven't been
defined, those definitions cause conflicts with the already-existing
functions.

Fixes:
  http://autobuild.buildroot.net/results/f34/f34dc20749c6f6d12c51eddf3ee6c2ef41d7c13d/

Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
---
 package/ruby/ruby.mk | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/package/ruby/ruby.mk b/package/ruby/ruby.mk
index 4c6459b..30b53d7 100644
--- a/package/ruby/ruby.mk
+++ b/package/ruby/ruby.mk
@@ -29,6 +29,13 @@ RUBY_CFLAGS += -O2
 endif
 RUBY_CONF_ENV = CFLAGS="$(RUBY_CFLAGS)"
 
+ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
+RUBY_CONF_ENV += \
+	ac_cv_func_finite=yes \
+	ac_cv_func_isinf=yes \
+	ac_cv_func_isnan=yes
+endif
+
 ifeq ($(BR2_bfin),y)
 RUBY_CONF_ENV += ac_cv_func_dl_iterate_phdr=no
 # Blackfin doesn't have FFI closure support, needed by the fiddle
-- 
2.10.2