Testing error conditions in builtin_functions.cpp works

64c5d86 introduced the tests as KNOWNBUG, even though they always
worked as described in their test specification. What is possibly buggy
about them is the hope that the errors would be caught earlier, but the
C front-end already does warn that the declaration is missing.

Author: tautschnig

regression/cbmc/assert_func_four/test.desc

@@ -1,6 +1,7 @@
-KNOWNBUG
+CORE
 main.c
 
+function .* is not declared
 ^EXIT=6$
 ^SIGNAL=0$
 expected to have four arguments

regression/cbmc/assert_lhs/test.desc

@@ -1,6 +1,7 @@
-KNOWNBUG
+CORE
 main.c
 
+function .* is not declared
 ^EXIT=6$
 ^SIGNAL=0$
 expected not to have LHS

regression/cbmc/assert_one/test.desc

@@ -1,6 +1,7 @@
-KNOWNBUG
+CORE
 main.c
 
+function .* is not declared
 ^EXIT=6$
 ^SIGNAL=0$
 expected to have one argument

regression/cbmc/assert_rtn_four/test.desc

@@ -1,6 +1,7 @@
-KNOWNBUG
+CORE
 main.c
 
+function .* is not declared
 ^EXIT=6$
 ^SIGNAL=0$
 expected to have four arguments

regression/cbmc/gcc_builtin_va_arg_one/test.desc

@@ -1,6 +1,7 @@
-KNOWNBUG
+CORE
 main.c
 
+function .* is not declared
 ^EXIT=6$
 ^SIGNAL=0$
 expected to have one argument

regression/cbmc/verifier_error_lhs/test.desc

@@ -1,6 +1,7 @@
-KNOWNBUG
+CORE
 main.c
 
+function .* is not declared
 ^EXIT=6$
 ^SIGNAL=0$
 expected not to have LHS

regression/cbmc/verifier_error_zero/test.desc

@@ -1,6 +1,7 @@
-KNOWNBUG
+CORE
 main.c
 
+function .* is not declared
 ^EXIT=6$
 ^SIGNAL=0$
 expected to have no arguments