1 files changed, 76 insertions, 0 deletions
diff --git a/gl/m4/utime.m4 b/gl/m4/utime.m4
new file mode 100644
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+++ b/gl/m4/utime.m4
@@ -0,0 +1,76 @@
+# utime.m4 serial 4
+dnl Copyright (C) 2017-2022 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_UTIME],
+[
+  AC_REQUIRE([gl_UTIME_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_CHECK_FUNCS_ONCE([lstat])
+  case "$host_os" in
+    mingw*)
+      dnl On this platform, the original utime() or _utime() produces
+      dnl timestamps that are affected by the time zone.
+      dnl Use the function name 'rpl_utime' always, in order to avoid a
+      dnl possible conflict with the function name 'utime' from oldnames.lib
+      dnl (MSVC) or liboldnames.a (mingw).
+      REPLACE_UTIME=1
+      ;;
+    *)
+      AC_CHECK_FUNCS([utime])
+      if test $ac_cv_func_utime = no; then
+        HAVE_UTIME=0
+      else
+        dnl On macOS 10.13, utime("link-to-file/", NULL) mistakenly succeeds.
+        AC_CACHE_CHECK([whether utime handles trailing slashes on files],
+          [gl_cv_func_utime_file_slash],
+          [touch conftest.tmp
+           # Assume that if we have lstat, we can also check symlinks.
+           if test $ac_cv_func_lstat = yes; then
+             ln -s conftest.tmp conftest.lnk
+           fi
+           AC_RUN_IFELSE(
+             [AC_LANG_PROGRAM(
+               [[#include <stddef.h>
+                 #include <utime.h>
+               ]],
+               [[int result = 0;
+                 if (!utime ("conftest.tmp/", NULL))
+                   result |= 1;
+                 #if HAVE_LSTAT
+                 if (!utime ("conftest.lnk/", NULL))
+                   result |= 2;
+                 #endif
+                 return result;
+               ]])],
+             [gl_cv_func_utime_file_slash=yes],
+             [gl_cv_func_utime_file_slash=no],
+             [case "$host_os" in
+                                 # Guess yes on Linux systems.
+                linux-* | linux) gl_cv_func_utime_file_slash="guessing yes" ;;
+                                 # Guess yes on glibc systems.
+                *-gnu* | gnu*)   gl_cv_func_utime_file_slash="guessing yes" ;;
+                                 # Guess no on macOS.
+                darwin*)         gl_cv_func_utime_file_slash="guessing no" ;;
+                                 # If we don't know, obey --enable-cross-guesses.
+                *)               gl_cv_func_utime_file_slash="$gl_cross_guess_normal" ;;
+              esac
+             ])
+           rm -f conftest.tmp conftest.lnk
+          ])
+        case $gl_cv_func_stat_file_slash in
+          *no)
+            REPLACE_UTIME=1
+            AC_DEFINE([REPLACE_FUNC_UTIME_FILE], [1],
+              [Define to 1 if utime needs help when passed a file name with a trailing slash])
+            ;;
+        esac
+      fi
+      ;;
+  esac
+])
+
+# Prerequisites of lib/utime.c.
+AC_DEFUN([gl_PREREQ_UTIME], [:])