[newlib-cygwin] newlib: strtold: use __builtin_nanl to avoid libm dependency

[newlib-cygwin] newlib: strtold: use __builtin_nanl to avoid libm dependency

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=35555851d700a267cca5070e65670c5a5f352d95

commit 35555851d700a267cca5070e65670c5a5f352d95
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Wed Oct 10 17:53:55 2018 +0200

    newlib: strtold: use __builtin_nanl to avoid libm dependency
    
    Commit 6c212a8b7873703c4f98c6b68579b234918be83a
    ("Fix strtod ("nan") and strtold ("nan") returns wrong negative NaN")
    introduced an unconditional dependency to nanl and, in turn, to libm.
    
    Rather than including nanl in libc as well, just call __builtin_nanl
    from here.  Requires GCC 3.3 or later.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/libc/stdlib/strtorx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/newlib/libc/stdlib/strtorx.c b/newlib/libc/stdlib/strtorx.c
index a35dabe..4faed85 100644
--- a/newlib/libc/stdlib/strtorx.c
+++ b/newlib/libc/stdlib/strtorx.c
@@ -89,7 +89,7 @@ ULtox(__UShort *L, __ULong *bits, Long exp, int k)
 		break;
 
 	  case STRTOG_NaN:
-		*((long double*)L) = nanl ("");
+		*((long double*)L) = __builtin_nanl ("");
 	  }
 	if (k & STRTOG_Neg)
 		L[_0] |= 0x8000;