build: fix recent build failure on systems without strtold

Recently introduced in commit v8.30-50-geb73e23

* gl/lib/cl-strtod.c: Fall back to strtod() on systems
without strtold() (like we already do in sort).

diff --git a/gl/lib/cl-strtod.c b/gl/lib/cl-strtod.c
index dd6eef82560597606853b27bd7703d07a2db88b3..998c2ef67891ade1c51b7350a197062212ecfce7 100644 (file)
--- a/gl/lib/cl-strtod.c
+++ b/gl/lib/cl-strtod.c
@@ -29,15 +29,20 @@
 #if LONG
 # define CL_STRTOD cl_strtold
 # define DOUBLE long double
-# define STRTOD strtold
 # define C_STRTOD c_strtold
 #else
 # define CL_STRTOD cl_strtod
 # define DOUBLE double
-# define STRTOD strtod
 # define C_STRTOD c_strtod
 #endif
 
+/* fall back on strtod if strtold doesn't conform to C99.  */
+#if LONG && HAVE_C99_STRTOLD
+# define STRTOD strtold
+#else
+# define STRTOD strtod
+#endif
+
 /* This function acts like strtod or strtold, except that it falls
    back on the C locale if the initial prefix is not parsable in
    the current locale.  If the prefix is parsable in both locales,