- 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 $gl_cv_func_frexpl_no_libm = no; then
- AC_CACHE_CHECK([whether frexpl() can be used with libm],
- [gl_cv_func_frexpl_in_libm],
- [
- save_LIBS="$LIBS"
- LIBS="$LIBS -lm"
- AC_TRY_LINK([#include <math.h>
- long double x;],
- [int e; return frexpl (x, &e) > 0;],
- [gl_cv_func_frexpl_in_libm=yes],
- [gl_cv_func_frexpl_in_libm=no])
- LIBS="$save_LIBS"
- ])
- if test $gl_cv_func_frexpl_in_libm = yes; then
- FREXPL_LIBM=-lm
+ 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; FREXPL_LIBM= ;;
+ 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.])