tcc -dt -run ... : simpler is better

* -dt now with lowercase t

* test snippets now separated by real preprocessor statements
  which is valid C also for other compilers

    #if defined test_xxx
       < test snippet x >
    #elif defined test_yyy
       < test snippet y >
    #elif ...
    #endif

* simpler implementation, behaves like -run if no 'test_...' macros
  are seen, works with -E too

* for demonstration I combined some of the small tests for errors
  and warnings (56..63,74) in "60_errors_and_warnings.c"

Also:
* libtcc.c:
  put tcc_preprocess() and tcc_assemble() under the setjmp clause
  to let them return to caller after errors.  This is for -dt -E.
* tccgen.c:
  - get rid of save/restore_parse_state(), macro_ptr is saved
    by begin_macro anyway, now line_num too.
  - use expr_eq for parsing _Generic's controlling_type
  - set nocode_wanted with const_wanted. too, This is to keep
    VT_JMP on vtop when parsing preprocessor expressions.
* tccpp.c: tcc -E: suppress trailing whitespace from lines with
  comments (that -E removes) such as
       NO_GOTPLT_ENTRY,\t    /* never generate ... */

1 files changed, 12 insertions, 14 deletions

diff --git a/tests/tests2/96_nodata_wanted.expect b/tests/tests2/96_nodata_wanted.expect
index 0db4ba2..9fd35ca 100644
--- a/tests/tests2/96_nodata_wanted.expect
+++ b/tests/tests2/96_nodata_wanted.expect
@@ -1,24 +1,22 @@
-/*-* test 1: initializer not computable 1 */
-test 1:3: error: initializer element is not computable at load time
+[test_static_data_error]
+96_nodata_wanted.c:7: error: initializer element is not computable at load time
 
-/*-* test 2: initializer not computable 2 */
-test 2:3: error: initializer element is not computable at load time
+[test_static_nodata_error]
+96_nodata_wanted.c:14: error: initializer element is not computable at load time
 
-/*-* test 3: initializer not computable 3 */
-test 3:2: error: initializer element is not computable at load time
+[test_global_data_error]
+96_nodata_wanted.c:20: error: initializer element is not computable at load time
 
-/*-* test 4: 2 cast warnings */
-test 4:2: warning: assignment makes integer from pointer without a cast
-test 4:2: warning: nonportable conversion from pointer to char/short
+[test_local_data_noerror]
+96_nodata_wanted.c:25: warning: assignment makes integer from pointer without a cast
+96_nodata_wanted.c:25: warning: nonportable conversion from pointer to char/short
 
-/*-* test 5; nodata_wanted test */
+[test_data_suppression]
 suppression off
   static data: 8 - 8.0 - 8.0 - main - static string
   static bitfields: 333 44 555555 6 7
   data length is not 0
+  text length is not 0
 suppression on
   data length is 0
-returns 0
-
-/*-* test 6: some test */
-returns 34
+  text length is 0