- if test "$ftruncate_missing" = yes; then
- AC_CHECK_HEADERS(unistd.h)
- AC_MSG_CHECKING([fcntl emulation of ftruncate])
- AC_CACHE_VAL(fu_cv_sys_ftruncate_emulation,
- [AC_TRY_LINK([
-#include <sys/types.h>
-#include <fcntl.h>], [
-#if !defined(F_CHSIZE) && !defined(F_FREESP)
- chsize();
-#endif
- ],
- fu_cv_sys_ftruncate_emulation=yes,
- fu_cv_sys_ftruncate_emulation=no)])
- AC_MSG_RESULT($fu_cv_sys_ftruncate_emulation)
- if test $fu_cv_sys_ftruncate_emulation = yes; then
- AC_LIBOBJ([ftruncate])
- fi
+AC_DEFUN([gl_FUNC_FTRUNCATE],
+[
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_CHECK_FUNCS_ONCE([ftruncate])
+ if test $ac_cv_func_ftruncate = no; then
+ HAVE_FTRUNCATE=0
+ AC_LIBOBJ([ftruncate])
+ gl_PREREQ_FTRUNCATE
+ case "$host_os" in
+ mingw*)
+ # Yes, we know mingw lacks ftruncate.
+ ;;
+ *)
+ # If someone lacks ftruncate, make configure fail, and request
+ # a bug report to inform us about it.
+ if test x"$SKIP_FTRUNCATE_CHECK" != xyes; then
+ AC_MSG_FAILURE([Your system lacks the ftruncate function.
+ Please report this, along with the output of "uname -a", to the
+ bug-coreutils@gnu.org mailing list. To continue past this point,
+ rerun configure with SKIP_FTRUNCATE_CHECK=yes.
+ E.g., ./configure SKIP_FTRUNCATE_CHECK=yes])
+ fi
+ esac