diff --git a/vlib/builtin/wasm_bare/libc_impl.c.v b/vlib/builtin/wasm_bare/libc_impl.c.v
index b4f69da108..d91bb55d2c 100644
--- a/vlib/builtin/wasm_bare/libc_impl.c.v
+++ b/vlib/builtin/wasm_bare/libc_impl.c.v
@@ -158,7 +158,3 @@ fn __exit(code int) {
 fn __qsort(base voidptr, nmemb usize, size usize, sort_cb FnSortCB) {
 	panic('qsort() is not yet implemented in `-freestanding`')
 }
-
-fn init_global_allocator() {
-	// global_allocator = dlmalloc.new(get_wasm_allocator())
-}
diff --git a/vlib/v/gen/c/assert.v b/vlib/v/gen/c/assert.v
index 20948a3b62..41173959a1 100644
--- a/vlib/v/gen/c/assert.v
+++ b/vlib/v/gen/c/assert.v
@@ -116,7 +116,9 @@ fn (mut g Gen) gen_assert_postfailure_mode(node ast.AssertStmt) {
 	}
 	if g.pref.assert_failure_mode == .backtraces
 		|| g.fn_decl.attrs.any(it.name == 'assert_backtraces') {
-		g.writeln('\tprint_backtrace();')
+		if _ := g.table.fns['print_backtrace'] {
+			g.writeln('\tprint_backtrace();')
+		}
 	}
 	if g.pref.is_test {
 		g.writeln('\tlongjmp(g_jump_buffer, 1);')
diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index 5705a000ee..a19e7da8da 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -6213,17 +6213,25 @@ fn (mut g Gen) write_init_function() {
 	}
 
 	if g.use_segfault_handler && !g.pref.is_shared {
-		// 11 is SIGSEGV. It is hardcoded here, to avoid FreeBSD compilation errors for trivial examples.
-		// shared object does not need this
-		g.writeln('#if __STDC_HOSTED__ == 1\n\tsignal(11, v_segmentation_fault_handler);\n#endif')
+		if _ := g.table.fns['v_segmentation_fault_handler'] {
+			// 11 is SIGSEGV. It is hardcoded here, to avoid FreeBSD compilation errors for trivial examples.
+			// shared object does not need this
+			g.writeln('#if __STDC_HOSTED__ == 1\n\tsignal(11, v_segmentation_fault_handler);\n#endif')
+		}
 	}
+
 	if g.pref.is_bare {
-		g.writeln('init_global_allocator();')
+		if _ := g.table.fns['init_global_allocator'] {
+			g.writeln('init_global_allocator();')
+		}
 	}
 
 	if g.pref.prealloc {
-		g.writeln('prealloc_vinit();')
+		if _ := g.table.fns['prealloc_vinit'] {
+			g.writeln('prealloc_vinit();')
+		}
 	}
+
 	// Note: the as_cast table should be *before* the other constant initialize calls,
 	// because it may be needed during const initialization of builtin and during
 	// calling module init functions too, just in case they do fail...
@@ -6233,7 +6241,9 @@ fn (mut g Gen) write_init_function() {
 	}
 	if !g.pref.is_shared && (!g.pref.skip_unused || g.table.used_features.external_types) {
 		// shared object does not need this
-		g.writeln('\tbuiltin_init();')
+		if _ := g.table.find_fn('builtin_init') {
+			g.writeln('\tbuiltin_init();')
+		}
 	}
 
 	if g.nr_closures > 0 {
diff --git a/vlib/v/gen/c/cmain.v b/vlib/v/gen/c/cmain.v
index 0d169b0561..8667c0944f 100644
--- a/vlib/v/gen/c/cmain.v
+++ b/vlib/v/gen/c/cmain.v
@@ -135,7 +135,12 @@ fn (mut g Gen) gen_c_main_function_header() {
 	g.gen_c_main_function_only_header()
 	g.gen_c_main_trace_calls_hook()
 	if !g.pref.no_builtin {
-		g.writeln2('\tg_main_argc = ___argc;', '\tg_main_argv = ___argv;')
+		if _ := g.table.global_scope.find_global('g_main_argc') {
+			g.writeln('\tg_main_argc = ___argc;')
+		}
+		if _ := g.table.global_scope.find_global('g_main_argv') {
+			g.writeln('\tg_main_argv = ___argv;')
+		}
 	}
 	if g.nr_closures > 0 {
 		g.writeln('\t__closure_init(); // main()')