Test failure: tests/gcc/link/positive/builtin-ctype-2.c fails with -O2

[remexre]

Without passing a -O flag to gcc, tests/gcc/link/positive/builtin-ctype-2.c is effectively getting no-opped:

ableC/testing/tests/gcc/link/positive/builtin-ctype-2.c

Lines 42 to 46 in d947074

	#ifdef __OPTIMIZE__
	TEST_CTYPE_CST_TRUE (isascii, 0);
	TEST_CTYPE_CST_TRUE (isascii, 1);
	TEST_CTYPE_CST_TRUE (isascii, 126);
	TEST_CTYPE_CST_TRUE (isascii, 127);

When this is actually set, it expands to code like:

# 43 "tests/gcc/link/positive/builtin-ctype-2.c"
  extern void link_failure_isascii_cst_true(void); extern int isascii(int); if (! isascii(0)) link_failure_isascii_cst_true();
  extern void link_failure_isascii_cst_true(void); extern int isascii(int); if (! isascii(1)) link_failure_isascii_cst_true();
  extern void link_failure_isascii_cst_true(void); extern int isascii(int); if (! isascii(126)) link_failure_isascii_cst_true();
  extern void link_failure_isascii_cst_true(void); extern int isascii(int); if (! isascii(127)) link_failure_isascii_cst_true();

  extern void link_failure_isascii_cst_false(void); extern int isascii(int); if (isascii(-1)) link_failure_isascii_cst_false();
  extern void link_failure_isascii_cst_false(void); extern int isascii(int); if (isascii(128)) link_failure_isascii_cst_false();
  extern void link_failure_isascii_cst_false(void); extern int isascii(int); if (isascii(129)) link_failure_isascii_cst_false();
  extern void link_failure_isascii_cst_false(void); extern int isascii(int); if (isascii(255)) link_failure_isascii_cst_false();

This gets errors like:

tests/gcc/link/positive/builtin-ctype-2.c:44:14: error: Redeclaration of link_failure_isascii_cst_true. Original (from tests/gcc/link/positive/builtin-ctype-2.c:43:14)
tests/gcc/link/positive/builtin-ctype-2.c:44:62: error: Redeclaration of isascii. Original (from tests/gcc/link/positive/builtin-ctype-2.c:43:62)
tests/gcc/link/positive/builtin-ctype-2.c:45:14: error: Redeclaration of link_failure_isascii_cst_true. Original (from tests/gcc/link/positive/builtin-ctype-2.c:44:14)
tests/gcc/link/positive/builtin-ctype-2.c:45:62: error: Redeclaration of isascii. Original (from tests/gcc/link/positive/builtin-ctype-2.c:44:62)
tests/gcc/link/positive/builtin-ctype-2.c:46:14: error: Redeclaration of link_failure_isascii_cst_true. Original (from tests/gcc/link/positive/builtin-ctype-2.c:45:14)
tests/gcc/link/positive/builtin-ctype-2.c:46:62: error: Redeclaration of isascii. Original (from tests/gcc/link/positive/builtin-ctype-2.c:45:62)

I'm distracted right now, but I think:

ableC/grammars/edu.umn.cs.melt.ableC/abstractsyntax/host/Decls.sv

Line 398 in d947074

if top.isTopLevel then

might be an incorrect check; should it instead always be true of functions? Or something like that?