- AC_CACHE_CHECK([whether frexpl() can be used without linking with libm],
- [gl_cv_func_frexpl_no_libm],
- [
- AC_TRY_LINK([#include <math.h>
- long double x;],
- [int e; return frexpl (x, &e) > 0;],
- [gl_cv_func_frexpl_no_libm=yes],
- [gl_cv_func_frexpl_no_libm=no])
- ])
- 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
+ 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
+ AC_CACHE_CHECK([whether frexpl() can be used without linking with libm],
+ [gl_cv_func_frexpl_no_libm],
+ [
+ AC_TRY_LINK([#include <math.h>
+ long double x;],
+ [int e; return frexpl (x, &e) > 0;],
+ [gl_cv_func_frexpl_no_libm=yes],
+ [gl_cv_func_frexpl_no_libm=no])
+ ])
+ 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