unpack-trees: handle lstat failure for existing directory

diff --git a/configure.ac b/configure.ac
index 5601e8bac953c670e35f32ffe48d157dd5694ce7..56731c35c9d1b5e2d2c82cdff51ab496dcbac7f5 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -706,6 +706,27 @@ else
 fi
 AC_SUBST(NO_C99_FORMAT)
 #
+# Define NO_REGEX if you have no or inferior regex support in your C library.
+AC_CACHE_CHECK([whether the platform regex can handle null bytes],
+ [ac_cv_c_excellent_regex], [
+AC_EGREP_CPP(yippeeyeswehaveit,
+       AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
+#include <regex.h>
+],
+[#ifdef REG_STARTEND
+yippeeyeswehaveit
+#endif
+]),
+       [ac_cv_c_excellent_regex=yes],
+       [ac_cv_c_excellent_regex=no])
+])
+if test $ac_cv_c_excellent_regex = yes; then
+       NO_REGEX=
+else
+       NO_REGEX=YesPlease
+fi
+AC_SUBST(NO_REGEX)
+#
 # Define FREAD_READS_DIRECTORIES if your are on a system which succeeds
 # when attempting to read from an fopen'ed directory.
 AC_CACHE_CHECK([whether system succeeds to read fopen'ed directory],
@@ -783,6 +804,12 @@ GIT_CHECK_FUNC(strcasestr,
 [NO_STRCASESTR=YesPlease])
 AC_SUBST(NO_STRCASESTR)
 #
+# Define NO_STRTOK_R if you don't have strtok_r
+GIT_CHECK_FUNC(strtok_r,
+[NO_STRTOK_R=],
+[NO_STRTOK_R=YesPlease])
+AC_SUBST(NO_STRTOK_R)
+#
 # Define NO_MEMMEM if you don't have memmem.
 GIT_CHECK_FUNC(memmem,
 [NO_MEMMEM=],