-# tanl.m4 serial 1
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# tanl.m4 serial 8
+dnl Copyright (C) 2010-2014 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])
AC_CACHE_CHECK([whether tanl() can be used without linking with libm],
[gl_cv_func_tanl_no_libm],
[
- AC_TRY_LINK([#ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- long double x;],
- [return tanl (x) > 0.4;],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ long double (*funcptr) (long double) = tanl;
+ long double x;]],
+ [[return funcptr (x) > 0.4
+ || tanl (x) > 0.4;]])],
[gl_cv_func_tanl_no_libm=yes],
[gl_cv_func_tanl_no_libm=no])
])
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
- AC_TRY_LINK([#ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- long double x;],
- [return tanl (x) > 0.4;],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ long double (*funcptr) (long double) = tanl;
+ long double x;]],
+ [[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 $gl_cv_func_tanl_in_libm = yes; then
dnl Also check whether it's declared.
- dnl MacOS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [#include <math.h>])
+ dnl Mac OS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [[#include <math.h>]])
else
HAVE_DECL_TANL=0
HAVE_TANL=0
- AC_LIBOBJ([tanl])
- AC_LIBOBJ([trigl])
- AC_REQUIRE([gl_FUNC_ISNANL])
- AC_REQUIRE([gl_FUNC_FLOOR])
- AC_REQUIRE([gl_FUNC_FLOORL])
- TANL_LIBM="$ISNANL_LIBM $FLOOR_LIBM $FLOORL_LIBM"
+ dnl Find libraries needed to link lib/tanl.c, lib/trigl.c.
+ 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])
])