-# logl.m4 serial 1
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# logl.m4 serial 7
+dnl Copyright (C) 2010-2012 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_LOGL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
dnl Persuade glibc <math.h> to declare logl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CACHE_CHECK([whether logl() can be used without linking with libm],
[gl_cv_func_logl_no_libm],
[
- AC_TRY_LINK([#ifndef __NO_MATH_INLINES
- # define __NO_MATH_INLINES 1 /* for glibc */
- #endif
- #include <math.h>
- long double x;],
- [return logl (x) > 1;],
+ 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) = logl;
+ long double x;]],
+ [[return funcptr (x) > 1
+ || logl (x) > 1;]])],
[gl_cv_func_logl_no_libm=yes],
[gl_cv_func_logl_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 logl (x) > 1;],
+ 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) = logl;
+ long double x;]],
+ [[return funcptr (x) > 1
+ || logl (x) > 1;]])],
[gl_cv_func_logl_in_libm=yes],
[gl_cv_func_logl_in_libm=no])
LIBS="$save_LIBS"
|| test $gl_cv_func_logl_in_libm = yes; then
dnl Also check whether it's declared.
dnl MacOS X 10.3 has logl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([logl], , [HAVE_DECL_LOGL=0], [#include <math.h>])
+ AC_CHECK_DECL([logl], , [HAVE_DECL_LOGL=0], [[#include <math.h>]])
else
HAVE_DECL_LOGL=0
HAVE_LOGL=0
- AC_LIBOBJ([logl])
- AC_REQUIRE([gl_FUNC_FREXPL])
- AC_REQUIRE([gl_FUNC_ISNANL])
- AC_REQUIRE([gl_FUNC_FLOORL])
- LOGL_LIBM="$FREXPL_LIBM $ISNANL_LIBM $FLOORL_LIBM"
+ dnl Find libraries needed to link lib/logl.c.
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_LOG])
+ LOGL_LIBM="$LOG_LIBM"
+ else
+ AC_REQUIRE([gl_FUNC_FREXPL])
+ AC_REQUIRE([gl_FUNC_ISNANL])
+ AC_REQUIRE([gl_FUNC_FLOORL])
+ dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+ case " $LOGL_LIBM " in
+ *" $FREXPL_LIBM "*) ;;
+ *) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;;
+ esac
+ dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+ case " $LOGL_LIBM " in
+ *" $ISNANL_LIBM "*) ;;
+ *) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;;
+ esac
+ dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+ case " $LOGL_LIBM " in
+ *" $FLOORL_LIBM "*) ;;
+ *) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;;
+ esac
+ fi
fi
AC_SUBST([LOGL_LIBM])
])