+ if test $HAVE_DECL_FREXPL = 1; then
+ gl_CHECK_FREXPL_NO_LIBM
+ if test $gl_cv_func_frexpl_no_libm = no; then
+ AC_CACHE_CHECK([whether frexpl() can be used with libm],
+ [gl_cv_func_frexpl_in_libm],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS -lm"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ long double x;]],
+ [[int e; return frexpl (x, &e) > 0;]])],
+ [gl_cv_func_frexpl_in_libm=yes],
+ [gl_cv_func_frexpl_in_libm=no])
+ LIBS="$save_LIBS"
+ ])
+ if test $gl_cv_func_frexpl_in_libm = yes; then
+ FREXPL_LIBM=-lm
+ fi
+ fi
+ if test $gl_cv_func_frexpl_no_libm = yes \
+ || test $gl_cv_func_frexpl_in_libm = yes; then
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $FREXPL_LIBM"
+ gl_FUNC_FREXPL_WORKS
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_frexpl_works" in
+ *yes) gl_func_frexpl=yes ;;
+ *) gl_func_frexpl=no; REPLACE_FREXPL=1 ;;
+ esac
+ else
+ gl_func_frexpl=no
+ fi
+ if test $gl_func_frexpl = yes; then
+ AC_DEFINE([HAVE_FREXPL], [1],
+ [Define if the frexpl() function is available.])
+ fi
+ fi
+ if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl = no; then
+ dnl Find libraries needed to link lib/frexpl.c.
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_FREXP])
+ FREXPL_LIBM="$FREXP_LIBM"
+ else
+ FREXPL_LIBM=
+ fi
+ fi
+ AC_SUBST([FREXPL_LIBM])
+])
+
+AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM],
+[
+ AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+ dnl Check whether it's declared.
+ dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]])
+ if test $HAVE_DECL_FREXPL = 1; then
+ gl_CHECK_FREXPL_NO_LIBM
+ if test $gl_cv_func_frexpl_no_libm = yes; then
+ gl_FUNC_FREXPL_WORKS
+ case "$gl_cv_func_frexpl_works" in
+ *yes) gl_func_frexpl_no_libm=yes ;;
+ *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;
+ esac
+ else
+ gl_func_frexpl_no_libm=no
+ dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.
+ REPLACE_FREXPL=1
+ fi
+ if test $gl_func_frexpl_no_libm = yes; then
+ AC_DEFINE([HAVE_FREXPL_IN_LIBC], [1],
+ [Define if the frexpl() function is available in libc.])
+ fi
+ fi
+])
+
+dnl Test whether frexpl() can be used without linking with libm.
+dnl Set gl_cv_func_frexpl_no_libm to 'yes' or 'no' accordingly.
+AC_DEFUN([gl_CHECK_FREXPL_NO_LIBM],
+[