From 0427d254207a69e394499d1abaea768f484f1cb5 Mon Sep 17 00:00:00 2001
From: Zuhaitz Méndez Fernández de Aránguiz <zuhaitz@debian>
Date: Fri, 30 Jan 2026 02:24:10 +0000
Subject: Improvements related to C23 (#112)

---
 src/codegen/codegen_decl.c | 4 ++++
 src/codegen/compat.h       | 6 +++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/codegen')

diff --git a/src/codegen/codegen_decl.c b/src/codegen/codegen_decl.c
index 31513ef..0b78676 100644
--- a/src/codegen/codegen_decl.c
+++ b/src/codegen/codegen_decl.c
@@ -85,7 +85,11 @@ void emit_preamble(ParserContext *ctx, FILE *out)
         else
         {
             // C mode
+            fputs("#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202300L\n", out);
+            fputs("#define ZC_AUTO auto\n", out);
+            fputs("#else\n", out);
             fputs("#define ZC_AUTO __auto_type\n", out);
+            fputs("#endif\n", out);
             fputs("#define ZC_CAST(T, x) ((T)(x))\n", out);
             fputs(ZC_TCC_COMPAT_STR, out);
             fputs("static inline const char* _z_bool_str(_Bool b) { return b ? \"true\" : "
diff --git a/src/codegen/compat.h b/src/codegen/compat.h
index 63a5af5..f8d9a4e 100644
--- a/src/codegen/compat.h
+++ b/src/codegen/compat.h
@@ -14,7 +14,11 @@
 #define ZC_EXTERN_C_END }
 #else
 /* C mode */
-#define ZC_AUTO __auto_type           ///< Auto type inference.
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202300L
+#define ZC_AUTO auto ///< C23 standard auto.
+#else
+#define ZC_AUTO __auto_type ///< GCC/Clang extension.
+#endif
 #define ZC_CAST(T, x) ((T)(x))        ///< Explicit cast.
 #define ZC_REINTERPRET(T, x) ((T)(x)) ///< Reinterpret cast.
 #define ZC_EXTERN_C                   ///< Extern "C" (no-op in C).
-- 
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