autoconf: Test FREAD_READS_DIRECTORIES

[git.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 287149d304b8a631d879bd3be7b059c6f074e5fe..82584e91532264790bac7efd953f9f5da09576c1 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -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.