Fixed github sdcc-gas issues #1, #2 and #4

Issue #1 was caused because code_name and data_name had been incorrectly
defined as const-qualified pointers, but this must be an exception for
the z80 backend, as stated by the comments.

Issue #2 has been solved by removing the --gas switch from SDCCmain.c,
renaming it to "--asm=" (as requested by PKK) and moved to STM8's main.c,
so the option is limited to those targets supporting it.

Issue #4 was because of SDCCglue.c, that generated local labels using
"!labeldef" instead of "!slabeldef", causing those __str_%d labels to be
printed as "__str_%d::" (the double colons stand for globa label according
to asxxx documentation) instead of "__str_%d":".

I ran the regression tests and most of them passed, but "wchar" returned another
"Multiple definition of..." error that I cannot explain so far. It is better than
nothing, though.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/stm8/main.c b/src/stm8/main.c
index 3226aae..b8c91a5 100644
--- a/src/stm8/main.c
+++ b/src/stm8/main.c
@@ -36,6 +36,7 @@
 #define OPTION_CODE_SEG             "--codeseg"
 #define OPTION_CONST_SEG            "--constseg"
 #define OPTION_ELF                  "--out-fmt-elf"
+#define OPTION_ASM                  "--asm="
 
 extern DEBUGFILE dwarf2DebugFile;
 extern int dwarf2FinalizeFile(FILE *);
@@ -46,6 +47,7 @@ static OPTION stm8_options[] = {
   {0, OPTION_CODE_SEG,        &options.code_seg, "<name> use this name for the code segment", CLAT_STRING},
   {0, OPTION_CONST_SEG,       &options.const_seg, "<name> use this name for the const segment", CLAT_STRING},
   {0, OPTION_ELF,             NULL, "Output executable in ELF format (deprecated)"},
+  {0, OPTION_ASM,             NULL, "Define assembler name (asxxxx/gas)"},
   {0}
 };
 
@@ -179,6 +181,21 @@ stm8_parseOptions (int *pargc, char **argv, int *i)
       debugFile = &dwarf2DebugFile;
       return TRUE;
     }
+  else if (!strncmp (argv[*i], OPTION_ASM, sizeof (OPTION_ASM) - 1))
+    {
+      char *asmblr = getStringArg (OPTION_ASM, argv, i, *pargc);
+
+      if (!strcmp (asmblr, "gas"))
+        {
+          options.gasOutput = true;
+          return TRUE;
+        }
+      else if (!strcmp (asmblr, "asxxxx"))
+        {
+          options.gasOutput = false;
+          return TRUE;
+        }
+    }
 
   return FALSE;
 }