Syntax check headers by C module when running the unit tests suite

Catch errors in the generated headers even when we don't have a run test.

Unfortunately this uncovered that almost no unit tests actually pass, so many,
many more of them had to be disabled.

Examples/Makefile.in

@@ -1734,15 +1734,19 @@ C_LDSHARED = @C_LDSHARED@
 CXX_LDSHARED = @CXX_LDSHARED@
 C_SO = @C_SO@
 
+SYNTAX_CHECK := $(CC) -fsyntax-only -x c
+
 c: $(SRCDIR_SRCS)
 	$(SWIG) -c $(SWIGOPT) -o $(ISRCS) $(INTERFACEPATH)
 	$(CC) -c $(CCSHARED) -I$(SRCDIR) $(CFLAGS) $(ISRCS) $(SRCDIR_SRCS) $(INCLUDES)
 	$(C_LDSHARED) $(CFLAGS) $(OBJS) $(IOBJS) $(LIBS) -o $(CLIBPREFIX)$(TARGET)$(C_SO)
-	
+	$(SYNTAX_CHECK) -I$(SRCDIR)$(INTERFACEDIR) $(IWRAP:.i=.h)
+
 c_cpp: $(SRCDIR_SRCS)
 	$(SWIG) -c++ -c $(SWIGOPT) -o $(ICXXSRCS) $(INTERFACEPATH)
 	$(CXX) -c $(CCSHARED) -I$(SRCDIR) $(CXXFLAGS) $(ICXXSRCS) $(SRCDIR_CXXSRCS) $(INCLUDES)
 	$(CXX_LDSHARED) $(CFLAGS) $(OBJS) $(IOBJS) $(LIBS) $(CPP_DLLIBS) -o $(CLIBPREFIX)$(TARGET)$(C_SO)
+	$(SYNTAX_CHECK) -I$(SRCDIR)$(INTERFACEDIR) $(IWRAP:.i=.h)
 
 c_compile: $(SRCDIR)$(RUNME).c
 	$(COMPILETOOL) $(CC) $(CFLAGS) -o $(RUNME) -I. $< -L. -l$(TARGET)

Examples/test-suite/c/Makefile.in

@@ -27,21 +27,42 @@ CPP_TEST_CASES := \
 # The following tests are currently broken and need to be fixed.
 FAILING_C_TESTS := \
     arrays \
+    enum_missing \
     funcptr \
     function_typedef \
     lextype \
+    li_carrays \
     li_cdata \
     li_constraints \
+    li_cpointer \
+    memberin_extend_c \
+    nested \
+    nested_extend_c \
+    nested_structs \
+    overload_extend2 \
+    overload_extend_c \
+    typedef_struct \
+    union_parameter \
+    unions \
 
 FAILING_CPP_TESTS := \
     abstract_typedef \
+    abstract_typedef2 \
     anonymous_bitfield \
     apply_signed_char \
+    apply_strings \
     argout \
     array_member \
+    array_typedef_memberin \
+    arrayref \
     arrays_dimensionless \
+    arrays_global \
+    arrays_global_twodim \
     bools \
+    char_binary \
     char_strings \
+    class_ignore \
+    class_scope_weird \
     constant_pointers \
     cpp_basic \
     cpp_basic_class_var_pub_member_built_in \
@@ -49,26 +70,42 @@ FAILING_CPP_TESTS := \
     cpp_basic_global_var_class \
     cpp_basic_template_class \
     cpp_basic_template_function \
+    cpp_namespace \
+    cpp_typedef \
     c_backend_cpp_natural_std_string \
     c_backend_cpp_exception \
+    default_arg_values \
     default_args \
     default_constructor \
+    derived_nested \
     director_basic \
     director_binary_string \
+    director_enum \
     director_frob \
     director_property \
     director_string \
+    enum_thorough \
+    enum_var \
     exception_order \
     extend \
     extend_constructor_destructor \
     extend_default \
     extend_placement \
+    extern_c \
     features \
+    friends_template \
     funcptr_cpp \
+    global_scope_types \
+    global_vars \
+    grouping \
+    import_nomodule \
+    inherit_missing \
+    kind \
     langobj \
     li_attribute \
     li_attribute_template \
     li_boost_shared_ptr \
+    li_boost_shared_ptr_bits \
     li_carrays_cpp \
     li_cdata_cpp \
     li_std_combinations \
@@ -76,21 +113,54 @@ FAILING_CPP_TESTS := \
     li_std_map \
     li_std_pair \
     li_std_pair_using \
+    li_std_string \
     li_std_vector \
+    li_swigtype_inout \
     li_windows \
+    long_long_apply \
+    member_funcptr_galore \
+    member_pointer \
     mixed_types \
+    multiple_inheritance_shared_ptr \
+    namespace_class \
+    namespace_typemap \
+    namespace_virtual_method \
+    naturalvar \
+    naturalvar_more \
     nested_class \
+    nested_scope \
+    nested_template_base \
     operator_overload \
     overload_arrays \
+    overload_polymorphic \
     overload_simple \
     primitive_ref \
+    refcount \
+    reference_global_vars \
+    register_par \
+    smart_pointer_extend \
     smart_pointer_not \
     smart_pointer_template_defaults_overload \
     special_variables \
+    struct_initialization_cpp \
+    template_arg_scope \
     template_arg_typename \
     template_basic \
+    template_default \
+    template_default_arg \
+    template_default_class_parms_typedef \
+    template_default_vw \
+    template_enum \
     template_explicit \
+    template_extend_overload \
+    template_forward \
+    template_nested \
+    template_ns2 \
     template_ns4 \
+    template_ns_enum \
+    template_ns_enum2 \
+    template_opaque \
+    template_retvalue \
     template_tbase_template \
     template_typedef \
     template_typedef_class_template \
@@ -98,19 +168,34 @@ FAILING_CPP_TESTS := \
     template_typedef_cplx2 \
     template_typedef_cplx3 \
     template_typedef_cplx4 \
+    template_typedef_cplx5 \
+    template_typedef_fnc \
     template_typedef_funcptr \
+    template_typemaps \
     template_typemaps_typedef \
     template_typemaps_typedef2 \
+    template_using_directive_and_declaration_forward \
+    template_whitespace \
     typedef_array_member \
+    typedef_funcptr \
     typedef_struct_cpp \
+    typemap_array_qualifiers \
     typemap_namespace \
+    typemap_template_parm_typedef \
+    typemap_variables \
+    typemap_various \
     using_extend \
+    valuewrapper_opaque \
     varargs \
     varargs_overload \
     virtual_poly \
     voidtest
 
 FAILING_MULTI_CPP_TESTS := \
+    clientdata_prop \
+    imports \
+    import_stl \
+    mod \
     template_typedef_import \
 
 include $(srcdir)/../common.mk