New module 'rintl'. * lib/math.in.h (rintl): New declaration. * lib/rintl.c: New file. * m4/rintl.m4: New file. * m4/math_h.m4 (gl_MATH_H): Test whether rintl is declared. (gl_MATH_H_DEFAULTS): Initialize GNULIB_RINTL, HAVE_RINTL. * modules/math (Makefile.am): Substitute GNULIB_RINTL, HAVE_RINTL. * modules/rintl: New file. * tests/test-math-c++.cc: Check the declaration of rintl. * modules/math-c++-tests (Makefile.am): Link test-math-c++ against $(RINTL_LIBM). Needed on IRIX 6.5 with cc. * doc/posix-functions/rintl.texi: Mention the new module.

--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -740,6 +740,20 @@
 # endif
 #endif
 
+#if @GNULIB_RINTL@
+# if !@HAVE_RINTL@
+_GL_FUNCDECL_SYS (rintl, long double, (long double x));
+# endif
+_GL_CXXALIAS_SYS (rintl, long double, (long double x));
+_GL_CXXALIASWARN (rintl);
+#elif defined GNULIB_POSIXCHECK
+# undef rintl
+# if HAVE_RAW_DECL_RINTL
+_GL_WARN_ON_USE (rintl, "rintl is unportable - "
+                 "use gnulib module rintl for portability");
+# endif
+#endif
+
 
 #if @GNULIB_ROUNDF@
 # if @REPLACE_ROUNDF@