-# tanl.m4 serial 4
-dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
+# tanl.m4 serial 8
+dnl Copyright (C) 2010-2013 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_TANL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
dnl Persuade glibc <math.h> to declare tanl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ long double (*funcptr) (long double) = tanl;
long double x;]],
- [[return tanl (x) > 0.4;]])],
+ [[return funcptr (x) > 0.4
+ || tanl (x) > 0.4;]])],
[gl_cv_func_tanl_no_libm=yes],
[gl_cv_func_tanl_no_libm=no])
])
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ long double (*funcptr) (long double) = tanl;
long double x;]],
- [[return tanl (x) > 0.4;]])],
+ [[return funcptr (x) > 0.4
+ || tanl (x) > 0.4;]])],
[gl_cv_func_tanl_in_libm=yes],
[gl_cv_func_tanl_in_libm=no])
LIBS="$save_LIBS"
if test $gl_cv_func_tanl_no_libm = yes \
|| test $gl_cv_func_tanl_in_libm = yes; then
dnl Also check whether it's declared.
- dnl MacOS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [#include <math.h>])
+ dnl Mac OS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [[#include <math.h>]])
else
HAVE_DECL_TANL=0
HAVE_TANL=0
dnl Find libraries needed to link lib/tanl.c, lib/trigl.c.
- AC_REQUIRE([gl_FUNC_ISNANL])
- AC_REQUIRE([gl_FUNC_FLOOR])
- AC_REQUIRE([gl_FUNC_FLOORL])
- dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
- case " $TANL_LIBM " in
- *" $ISNANL_LIBM "*) ;;
- *) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;;
- esac
- dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
- case " $TANL_LIBM " in
- *" $FLOOR_LIBM "*) ;;
- *) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;;
- esac
- dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
- case " $TANL_LIBM " in
- *" $FLOORL_LIBM "*) ;;
- *) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;;
- esac
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_TAN])
+ TANL_LIBM="$TAN_LIBM"
+ else
+ AC_REQUIRE([gl_FUNC_ISNANL])
+ AC_REQUIRE([gl_FUNC_FLOOR])
+ AC_REQUIRE([gl_FUNC_FLOORL])
+ dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
+ case " $TANL_LIBM " in
+ *" $ISNANL_LIBM "*) ;;
+ *) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;;
+ esac
+ dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
+ case " $TANL_LIBM " in
+ *" $FLOOR_LIBM "*) ;;
+ *) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;;
+ esac
+ dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
+ case " $TANL_LIBM " in
+ *" $FLOORL_LIBM "*) ;;
+ *) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;;
+ esac
+ fi
fi
AC_SUBST([TANL_LIBM])
])