[ruby-core:75691] [Ruby trunk Bug#12417] warning: "isfinite" redefined when compiling bigdecimal.c on cygwin

From: duerst@...
Date: 2016-05-23 11:08:19 UTC
List: ruby-core #75691
Issue #12417 has been reported by Martin Dürst.

----------------------------------------
Bug #12417: warning: "isfinite" redefined when compiling bigdecimal.c on cygwin
https://bugs.ruby-lang.org/issues/12417

* Author: Martin Dürst
* Status: Open
* Priority: Normal
* Assignee: Shyouhei Urabe
* ruby -v: ruby 2.4.0dev (2016-05-23 trunk 55132) [x86_64-cygwin]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
When using `make up; make install-nodoc`, I get the following warning:

```
compiling bigdecimal.c
bigdecimal.c:34:0: warning: "isfinite" redefined
 # define isfinite(x) finite(x)
 ^
In file included from ../.././include/ruby/missing.h:23:0,
                 from ../.././include/ruby/defines.h:125,
                 from ../.././include/ruby/ruby.h:36,
                 from bigdecimal.h:12,
                 from bigdecimal.c:13:
/usr/include/math.h:238:0: note: this is the location of the previous definition
     #define isfinite(__x) (__builtin_isfinite (__x))
 ^
cc1: warning: unrecognized command line option ‘-Wno-self-assign’
cc1: warning: unrecognized command line option ‘-Wno-constant-logical-operand’
cc1: warning: unrecognized command line option ‘-Wno-parentheses-equality’
cc1: warning: unrecognized command line option ‘-Wno-tautological-compare’
linking shared-object bigdecimal.so
```



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