patch 8.0.1730: no configure check for the used C99 features
Problem: No configure check for the used C99 features.
Solution: Add a compilation check. Tentatively document C99 features.
diff --git a/src/auto/configure b/src/auto/configure
index 8ecff53..6673de8 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -4179,6 +4179,40 @@
fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if the compiler can handle Vim code" >&5
+$as_echo_n "checking if the compiler can handle Vim code... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+#include <stdio.h>
+int
+main ()
+{
+
+ struct with_flexible_member {
+ int count; // comment
+ char text[]; // another comment
+ };
+ enum {
+ one,
+ two,
+ three,
+ };
+ long long int a = 1;
+ long long unsigned b = 2;
+ printf("a %lld and a %llu", a, b);
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+ as_fn_error $? "compiler does not work properly - see auto/config.log" "$LINENO" 5
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking --enable-fail-if-missing argument" >&5
$as_echo_n "checking --enable-fail-if-missing argument... " >&6; }