+2011-10-10 Bruno Haible <bruno@clisp.org>
+
+ atanl: Simplify for platforms where 'long double' == 'double'.
+ * lib/atanl.c (atanl) [HAVE_SAME_LONG_DOUBLE_AS_DOUBLE]: New
+ alternative implementation.
+ * m4/atanl.m4 (gl_FUNC_ATANL): Require gl_LONG_DOUBLE_VS_DOUBLE.
+ Determine ATANL_LIBM according to HAVE_SAME_LONG_DOUBLE_AS_DOUBLE.
+ * modules/atanl (Depends-on): Add atan. Update conditions.
+
2011-10-10 Bruno Haible <bruno@clisp.org>
acosl: Simplify for platforms where 'long double' == 'double'.
-# atanl.m4 serial 5
+# atanl.m4 serial 6
dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_DEFUN([gl_FUNC_ATANL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
dnl Persuade glibc <math.h> to declare atanl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
HAVE_DECL_ATANL=0
HAVE_ATANL=0
dnl Find libraries needed to link lib/atanl.c.
- AC_REQUIRE([gl_FUNC_ISNANL])
- dnl Append $ISNANL_LIBM to ATANL_LIBM, avoiding gratuitous duplicates.
- case " $ATANL_LIBM " in
- *" $ISNANL_LIBM "*) ;;
- *) ATANL_LIBM="$ATANL_LIBM $ISNANL_LIBM" ;;
- esac
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_ATAN])
+ ATANL_LIBM="$ATAN_LIBM"
+ else
+ AC_REQUIRE([gl_FUNC_ISNANL])
+ dnl Append $ISNANL_LIBM to ATANL_LIBM, avoiding gratuitous duplicates.
+ case " $ATANL_LIBM " in
+ *" $ISNANL_LIBM "*) ;;
+ *) ATANL_LIBM="$ATANL_LIBM $ISNANL_LIBM" ;;
+ esac
+ fi
fi
AC_SUBST([ATANL_LIBM])
])
Depends-on:
math
extensions
-isnanl [test $HAVE_ATANL = 0]
+atan [test $HAVE_ATANL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1]
+isnanl [test $HAVE_ATANL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
configure.ac:
gl_FUNC_ATANL