restricted c header imports

compiler/backend/backend.odin

@@ -2,6 +2,7 @@ package backend
 
 import "../linker"
 import "../target"
+import "../cimport"
 import "core:fmt"
 import "core:mem"
 import "core:os"
@@ -16,6 +17,7 @@ build_command :: proc(
 	llvm_path, output_path: string,
 	link_arguments: []linker.Argument,
 	selected := target.DEFAULT,
+	c_options := cimport.Options{},
 	allocator := context.allocator,
 ) -> []string {
 	command: [dynamic]string
@@ -26,7 +28,14 @@ build_command :: proc(
 	append_owned(&command, "-target", allocator)
 	append_owned(&command, target.name(selected), allocator)
 	append_owned(&command, "-Wno-override-module", allocator)
+	append_owned(&command, "-Wno-unused-command-line-argument", allocator)
 	append_owned(&command, llvm_path, allocator)
+	for path in c_options.include_paths {
+		append(&command, fmt.aprintf("-I%s", path, allocator=allocator))
+	}
+	for define in c_options.defines {
+		append(&command, fmt.aprintf("-D%s", define, allocator=allocator))
+	}
 	for argument in link_arguments {
 		switch argument.kind {
 		case .Input:
@@ -53,12 +62,13 @@ compile :: proc(
 	llvm_path, output_path: string,
 	link_arguments: []linker.Argument = nil,
 	selected := target.DEFAULT,
+	c_options := cimport.Options{},
 ) -> bool {
 	pid := os2.get_pid()
 	temporary_output := fmt.tprintf("%s.brolang-tmp-%d", output_path, pid)
 	defer _ = os.remove(temporary_output)
 
-	command := build_command(llvm_path, temporary_output, link_arguments, selected)
+	command := build_command(llvm_path, temporary_output, link_arguments, selected, c_options)
 	defer destroy_command(command)
 	state, stdout, stderr, err := os2.process_exec(
 		os2.Process_Desc{command=command},