From 1d7cd873dff0ee54aa41434c8b001a5cd467dc3c Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Wed, 3 Sep 2025 20:40:18 +0900
Subject: feat: add --std=c23

---
 Makefile     | 4 ++--
 src/cli.c    | 2 ++
 src/common.h | 4 ++++
 src/std.h    | 2 +-
 4 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 773f3d7..e9b1143 100644
--- a/Makefile
+++ b/Makefile
@@ -26,10 +26,10 @@ $(BUILD_DIR):
 
 # TODO: provide release build?
 $(BUILD_ROOT_DIR)/$(TARGET): $(OBJECTS)
-	$(CC) -Wall -MMD -g -O0 -o $@ $^
+	$(CC) -Wall -MMD -g -O0 --std=c23 -o $@ $^
 
 # TODO: provide release build?
 $(BUILD_DIR)/%.o: src/%.c
-	$(CC) -c -Wall -MMD -g -O0 -o $@ $<
+	$(CC) -c -Wall -MMD -g -O0 --std=c23 -o $@ $<
 
 -include $(BUILD_DIR)/*.d
diff --git a/src/cli.c b/src/cli.c
index bd0d915..c5649f0 100644
--- a/src/cli.c
+++ b/src/cli.c
@@ -39,6 +39,8 @@ CliArgs* parse_cli_args(int argc, char** argv) {
         } else if (strcmp(argv[i], "--version") == 0) {
             print_version();
             exit(0);
+        } else if (strcmp(argv[i], "--std=c23") == 0) {
+            // ignore --std=c23
         } else {
             fatal_error("unknown option: %s", argv[i]);
         }
diff --git a/src/common.h b/src/common.h
index 4bd4c17..332b61d 100644
--- a/src/common.h
+++ b/src/common.h
@@ -5,7 +5,11 @@
 
 _Noreturn void fatal_error(const char* msg, ...);
 
+// TODO
+#ifdef __ducc__
 #define unreachable() fatal_error("%s:%d: unreachable", __FILE__, __LINE__)
+#endif
+
 #define unimplemented() fatal_error("%s:%d: unimplemented", __FILE__, __LINE__)
 
 bool str_ends_with(const char* s, const char* suffix);
diff --git a/src/std.h b/src/std.h
index d584e1a..c2d7b26 100644
--- a/src/std.h
+++ b/src/std.h
@@ -16,7 +16,7 @@ int fclose(FILE*);
 int fprintf(FILE*, const char*, ...);
 char* fgets(char*, int, FILE*);
 FILE* fopen(const char*, const char*);
-int getchar(void);
+int getchar();
 int isalnum(int);
 int isalpha(int);
 int isdigit(int);
-- 
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