Re: [Tinycc-devel] Add max_align_t to stddef.h and C11

[Christian Jullien]

> Maybe add a global variable

Not global but a new member of TCCState, for example cversion

If (s->cversion >= 201112) {
  /* Hello C11 */
}

Diff becomes:

address@hidden:~/new-tcc $ git diff
diff --git a/libtcc.c b/libtcc.c
index df7adab..7883734 100644
--- a/libtcc.c
+++ b/libtcc.c
@@ -1790,8 +1790,16 @@ reparse:
             s->static_link = 1;
             break;
         case TCC_OPTION_std:
-           /* silently ignore, a current purpose:
-              allow to use a tcc as a reference compiler for "make test" */
+            if (*optarg == '=') {
+                ++optarg;
+                if (strcmp(optarg, "c11") == 0) {
+                   tcc_undefine_symbol(s, "__STDC_VERSION__");
+                   tcc_define_symbol(s, "__STDC_VERSION__", "201112L");
+                   s->cversion = 201112;
+                }
+            }
+             /* silently ignore other values, a current purpose:
+                allow to use a tcc as a reference compiler for "make test"
*/
             break;
         case TCC_OPTION_shared:
             x = TCC_OUTPUT_DLL;
diff --git a/tcc.c b/tcc.c
index f780389..2d4e1ea 100644
--- a/tcc.c
+++ b/tcc.c
@@ -33,6 +33,8 @@ static const char help[] =
     "  -o outfile  set output filename\n"
     "  -run        run compiled source\n"
     "  -fflag      set or reset (with 'no-' prefix) 'flag' (see tcc -hh)\n"
+    "  -std=c99    Conform to the ISO 1999 C standard (default).\n"
+    "  -std=c11    Conform to the ISO 2011 C standard.\n"
     "  -Wwarning   set or reset (with 'no-' prefix) 'warning' (see tcc
-hh)\n"
     "  -w          disable all warnings\n"
     "  -v -vv      show version, show search paths or loaded files\n"
diff --git a/tcc.h b/tcc.h
index cc85291..8416cc5 100644
--- a/tcc.h
+++ b/tcc.h
@@ -651,6 +651,7 @@ struct TCCState {
     int rdynamic; /* if true, all symbols are exported */
     int symbolic; /* if true, resolve symbols in the current module first
*/
     int filetype; /* file type for compilation (NONE,C,ASM) */
+    int cversion; /* supported C ISO version, either 0 (199901), 201112,
... */

     char *tcc_lib_path; /* CONFIG_TCCDIR or -B option */
     char *soname; /* as specified on the command line (-soname) */