- AC_REPLACE_FUNCS(ftruncate)
- if test $ac_cv_func_ftruncate = no; then
- gl_PREREQ_FTRUNCATE
- # If someone lacks ftruncate, make configure fail, and request
- # a bug report to inform us about it.
- if test x"$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 set in the environment.
- E.g., env SKIP_FTRUNCATE_CHECK=yes ./configure])
- fi
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([ftruncate])
+ if test $ac_cv_func_ftruncate = yes; then
+ m4_ifdef([gl_LARGEFILE], [
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ case "$host_os" in
+ mingw*)
+ dnl Native Windows, and Large File Support is requested.
+ dnl The MSVCRT _chsize() function only accepts a 32-bit file size,
+ dnl and the mingw64 ftruncate64() function is unreliable (it may
+ dnl delete the file, see
+ dnl <http://mingw-w64.sourcearchive.com/documentation/2.0-1/ftruncate64_8c_source.html>).
+ dnl Use gnulib's ftruncate() implementation instead.
+ REPLACE_FTRUNCATE=1
+ ;;
+ esac
+ ], [
+ :
+ ])
+ else
+ HAVE_FTRUNCATE=0