t/test-lib.sh: add test_external and test_external_without_stderr

diff --git a/configure.ac b/configure.ac
index 287149d304b8a631d879bd3be7b059c6f074e5fe..7c2856efc92ca55e3cf03fcf1c72ffb70318f7c3 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -158,7 +158,7 @@ AC_CHECK_LIB([crypto], [SHA1_Init],
 AC_SUBST(NEEDS_SSL_WITH_CRYPTO)
 AC_SUBST(NO_OPENSSL)
 #
-# Define NO_CURL if you do not have curl installed.  git-http-pull and
+# Define NO_CURL if you do not have libcurl installed.  git-http-pull and
 # git-http-push are not built, and you cannot use http:// and https://
 # transports.
 AC_CHECK_LIB([curl], [curl_global_init],
@@ -327,6 +327,26 @@ else
 fi
 AC_SUBST(NO_C99_FORMAT)
 #
+# 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],
+ [ac_cv_fread_reads_directories],
+[
+AC_RUN_IFELSE(
+       [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
+               [[char c;
+               FILE *f = fopen(".", "r");
+               return f && fread(&c, 1, 1, f)]])],
+       [ac_cv_fread_reads_directories=no],
+       [ac_cv_fread_reads_directories=yes])
+])
+if test $ac_cv_fread_reads_directories = yes; then
+       FREAD_READS_DIRECTORIES=UnfortunatelyYes
+else
+       FREAD_READS_DIRECTORIES=
+fi
+AC_SUBST(FREAD_READS_DIRECTORIES)
+#
 # Define SNPRINTF_RETURNS_BOGUS if your are on a system which snprintf()
 # or vsnprintf() return -1 instead of number of characters which would
 # have been written to the final string if enough space had been available.