+AC_CACHE_CHECK(
+ [for vsnprintf reporting bad format strings],
+ [folly_cv_prog_vsnprintf_bad_format],
+ [AC_RUN_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <stdio.h>
+
+ int main(int argc, char** argv) {
+ char buf[256];
+ return vsnprintf(buf, sizeof(buf), "%", 1) < 0 ? 0 : 1;
+ }]],
+ [folly_cv_prog_vsnprintf_bad_format="yes"],
+ [folly_cv_prog_vsnprintf_bad_format="no"])])
+
+if test "$folly_cv_prog_vsnprintf_bad_format" = yes; then
+ AC_DEFINE([HAVE_VSNPRINTF_ERRORS], [1],
+ [Define to 1 if the vsnprintf supports returning errors on bad format strings.])
+fi
+