tccpp: fix issues, add tests

* fix some macro expansion issues
* add some pp tests in tests/pp
* improved tcc -E output for better diff'ability
* remove -dD feature (quirky code, exotic feature,
  didn't work well)

Based partially on ideas / researches from PipCet

Some issues remain with VA_ARGS macros (if used in a
rather tricky way).

Also, to keep it simple, the pp doesn't automtically
add any extra spaces to separate tokens which otherwise
would form wrong tokens if re-read from tcc -E output
(such as '+' '=')  GCC does that, other compilers don't.

 * cleanups
  - #line 01 "file" / # 01 "file" processing
  - #pragma comment(lib,"foo")
  - tcc -E: forward some pragmas to output (pack, comment(lib))
  - fix macro parameter list parsing mess from
    a3fc54345949535524d01319e1ca6378b7c2c201
    a715d7143d9d17da17e67fec6af1c01409a71a31
    (some coffee might help, next time ;)
  - introduce TOK_PPSTR - to have character constants as
    written in the file (similar to TOK_PPNUM)
  - allow '\' appear in macros
  - new functions begin/end_macro to:
      - fix switching macro levels during expansion
      - allow unget_tok to unget more than one tok
  - slight speedup by using bitflags in isidnum_table

Also:
  - x86_64.c : fix decl after statements
  - i386-gen,c : fix a vstack leak with VLA on windows
  - configure/Makefile : build on windows (MSYS) was broken
  - tcc_warning: fflush stderr to keep output order (win32)

1 files changed, 5 insertions, 4 deletions

diff --git a/x86_64-gen.c b/x86_64-gen.c
index 8495737..2d69b75 100644
--- a/x86_64-gen.c
+++ b/x86_64-gen.c
@@ -1254,12 +1254,12 @@ void gfunc_call(int nb_args)
               in on the stack and swap it back to its original position
               if it is a register. */
             SValue tmp = vtop[0];
+            int arg_stored = 1;
+
             vtop[0] = vtop[-i];
             vtop[-i] = tmp;
-            
             mode = classify_x86_64_arg(&vtop->type, NULL, &size, &align, &reg_count);
             
-            int arg_stored = 1;
             switch (vtop->type.t & VT_BTYPE) {
             case VT_STRUCT:
                 if (mode == x86_64_mode_sse) {
@@ -1413,9 +1413,10 @@ void gfunc_call(int nb_args)
         } else if (mode == x86_64_mode_integer) {
             /* simple type */
             /* XXX: implicit cast ? */
+            int d;
             gen_reg -= reg_count;
             r = gv(RC_INT);
-            int d = arg_prepare_reg(gen_reg);
+            d = arg_prepare_reg(gen_reg);
             orex(1,d,r,0x89); /* mov */
             o(0xc0 + REG_VALUE(r) * 8 + REG_VALUE(d));
             if (reg_count == 2) {
@@ -2225,7 +2226,6 @@ ST_FUNC void gen_vla_sp_restore(int addr) {
 
 /* Subtract from the stack pointer, and push the resulting value onto the stack */
 ST_FUNC void gen_vla_alloc(CType *type, int align) {
-    int r;
 #ifdef TCC_TARGET_PE
     /* alloca does more than just adjust %rsp on Windows */
     vpush_global_sym(&func_old_type, TOK_alloca);
@@ -2233,6 +2233,7 @@ ST_FUNC void gen_vla_alloc(CType *type, int align) {
     gfunc_call(1);
     vset(type, REG_IRET, 0);
 #else
+    int r;
     r = gv(RC_INT); /* allocation size */
     /* sub r,%rsp */
     o(0x2b48);