-# logl.m4 serial 2
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# logl.m4 serial 9
+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_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"
if test $gl_cv_func_logl_no_libm = yes \
|| test $gl_cv_func_logl_in_libm = yes; then
dnl Also check whether it's declared.
- dnl MacOS X 10.3 has logl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([logl], , [HAVE_DECL_LOGL=0], [#include <math.h>])
+ dnl Mac OS X 10.3 has logl() in libc but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([logl], , [HAVE_DECL_LOGL=0], [[#include <math.h>]])
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $LOGL_LIBM"
+ gl_FUNC_LOGL_WORKS
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_logl_works" in
+ *yes) ;;
+ *) REPLACE_LOGL=1 ;;
+ esac
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])
- 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
+ HAVE_DECL_LOGL=0
+ fi
+ if test $HAVE_LOGL = 0 || test $REPLACE_LOGL = 1; then
+ 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
+ if test $HAVE_LOGL = 0; then
+ 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 $FLOORL_LIBM" ;;
+ esac
+ fi
+ fi
fi
AC_SUBST([LOGL_LIBM])
])
+
+dnl Test whether logl() works.
+dnl On OSF/1 5.1, logl(-0.0L) is NaN.
+AC_DEFUN([gl_FUNC_LOGL_WORKS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether logl works], [gl_cv_func_logl_works],
+ [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <math.h>
+volatile long double x;
+long double y;
+int main ()
+{
+ x = -0.0L;
+ y = logl (x);
+ if (!(y + y == y))
+ return 1;
+ return 0;
+}
+]])],
+ [gl_cv_func_logl_works=yes],
+ [gl_cv_func_logl_works=no],
+ [case "$host_os" in
+ osf*) gl_cv_func_logl_works="guessing no";;
+ *) gl_cv_func_logl_works="guessing yes";;
+ esac
+ ])
+ ])
+])