openat: work around AIX 7.1 fstatat issue

[gnulib.git] / m4 / openat.m4

diff --git a/m4/openat.m4 b/m4/openat.m4
index affb114..5683650 100644 (file)
--- a/m4/openat.m4
+++ b/m4/openat.m4
@@ -1,4 +1,4 @@
-# serial 33
+# serial 35
 # See if we need to use our replacement for Solaris' openat et al functions.
 
 dnl Copyright (C) 2004-2011 Free Software Foundation, Inc.
@@ -23,8 +23,7 @@ AC_DEFUN([gl_FUNC_OPENAT],
   GNULIB_UNLINKAT=1
 
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_CHECK_FUNCS_ONCE([lchmod])
-  AC_CHECK_FUNCS([fchmodat fstatat mkdirat openat unlinkat])
+  AC_CHECK_FUNCS_ONCE([fchmodat lchmod mkdirat openat unlinkat])
   AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
   AC_REQUIRE([gl_FUNC_UNLINK])
   case $ac_cv_func_openat+$gl_cv_func_lstat_dereferences_slashed_symlink in
@@ -37,13 +36,11 @@ AC_DEFUN([gl_FUNC_OPENAT],
     # Solaris 9 has *at functions, but uniformly mishandles trailing
     # slash in all of them.
     REPLACE_OPENAT=1
-    REPLACE_FSTATAT=1
     REPLACE_UNLINKAT=1
     ;;
   *)
     HAVE_OPENAT=0
     HAVE_UNLINKAT=0 # No known system with unlinkat but not openat
-    HAVE_FSTATAT=0 # No known system with fstatat but not openat
     gl_PREREQ_OPENAT;;
   esac
   if test $ac_cv_func_fchmodat != yes; then
@@ -53,6 +50,7 @@ AC_DEFUN([gl_FUNC_OPENAT],
     HAVE_MKDIRAT=0
   fi
   gl_FUNC_FCHOWNAT
+  gl_FUNC_FSTATAT
 ])
 
 # gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
@@ -155,6 +153,22 @@ AC_DEFUN([gl_FUNC_FCHOWNAT],
     [HAVE_FCHOWNAT=0])
 ])
 
+# If we have the fstatat function, and it has the bug (in AIX 7.1)
+# that it does not fill in st_size correctly, use the replacement function.
+AC_DEFUN([gl_FUNC_FSTATAT],
+[
+  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+  AC_CHECK_FUNCS_ONCE([fstatat])
+
+  if test $ac_cv_func_fstatat = no; then
+    HAVE_FSTATAT=0
+  elif test $gl_cv_func_lstat_dereferences_slashed_symlink != yes; then
+    REPLACE_FSTATAT=1
+  fi
+])
+
 AC_DEFUN([gl_PREREQ_OPENAT],
 [
   AC_REQUIRE([AC_C_INLINE])