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Diffstat (limited to 'gl/m4/ftruncate.m4')
| -rw-r--r-- | gl/m4/ftruncate.m4 | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/gl/m4/ftruncate.m4 b/gl/m4/ftruncate.m4 index 1007f34120..969eb0412d 100644 --- a/gl/m4/ftruncate.m4 +++ b/gl/m4/ftruncate.m4 @@ -1,4 +1,4 @@ -# serial 18 +# serial 19 # See if we need to emulate a missing ftruncate function using chsize. @@ -11,7 +11,24 @@ AC_DEFUN([gl_FUNC_FTRUNCATE], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_CHECK_FUNCS_ONCE([ftruncate]) - if test $ac_cv_func_ftruncate = no; then + 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 fi ]) |