Fix for #10

3 files changed, 8 insertions, 5 deletions

diff --git a/src/codegen/codegen.h b/src/codegen/codegen.h
index d489fb3..4b66f99 100644
--- a/src/codegen/codegen.h
+++ b/src/codegen/codegen.h
@@ -24,7 +24,7 @@ const char *parse_original_method_name(const char *mangled);
 void emit_auto_type(ParserContext *ctx, ASTNode *init_expr, Token t, FILE *out);
 
 // Declaration emission  (codegen_decl.c).
-void emit_preamble(FILE *out);
+void emit_preamble(ParserContext *ctx, FILE *out);
 void emit_includes_and_aliases(ASTNode *node, FILE *out);
 void emit_struct_defs(ParserContext *ctx, ASTNode *node, FILE *out);
 void emit_trait_defs(ASTNode *node, FILE *out);
diff --git a/src/codegen/codegen_decl.c b/src/codegen/codegen_decl.c
index ac4ae14..4979236 100644
--- a/src/codegen/codegen_decl.c
+++ b/src/codegen/codegen_decl.c
@@ -8,7 +8,7 @@
 #include <string.h>
 
 // Emit C preamble with standard includes and type definitions.
-void emit_preamble(FILE *out)
+void emit_preamble(ParserContext *ctx, FILE *out)
 {
     if (g_config.is_freestanding)
     {
@@ -54,8 +54,11 @@ void emit_preamble(FILE *out)
         fputs("#include <unistd.h>\n#include <fcntl.h>\n", out); // POSIX functions
         fputs("#ifdef __TINYC__\n#define __auto_type __typeof__\n#endif\n", out);
         fputs("typedef size_t usize;\ntypedef char* string;\n", out);
-        fputs("#include <pthread.h>\n", out);
-        fputs("typedef struct { pthread_t thread; void *result; } Async;\n", out);
+        if (ctx->has_async)
+        {
+            fputs("#include <pthread.h>\n", out);
+            fputs("typedef struct { pthread_t thread; void *result; } Async;\n", out);
+        }
         fputs("typedef struct { void *func; void *ctx; } z_closure_T;\n", out);
         fputs("#define U0 void\n#define I8 int8_t\n#define U8 uint8_t\n#define I16 "
               "int16_t\n#define U16 uint16_t\n",
diff --git a/src/codegen/codegen_main.c b/src/codegen/codegen_main.c
index c9c69f6..3634af3 100644
--- a/src/codegen/codegen_main.c
+++ b/src/codegen/codegen_main.c
@@ -202,7 +202,7 @@ void codegen_node(ParserContext *ctx, ASTNode *node, FILE *out)
 
         if (!ctx->skip_preamble)
         {
-            emit_preamble(out);
+            emit_preamble(ctx, out);
         }
         emit_includes_and_aliases(kids, out);