tccgen: nodata_wanted

The existing variable 'nocode_wanted' is now used to control
output of static data too. So...

(nocode_wanted == 0)
    code and data (normal within functions)
(nocode_wanted < 0)
    means: no code, but data (global or static data)
(nocode_wanted > 0)
    means: no code and no data (code and data suppressed)
(nocode_wanted & 0xC0000000)
    means:  we're in declaration of static data

Also: new option '-dT' to be used with -run
    tcc -dT -run file.c
This will look in file.c for certain comment-boundaries:
    /*-* test-xxx: ...some description */
and then for each test below run it from memory.  This way
various features and error messages can be tested with one
single file.  See 96_nodata_wanted.c for an example.

Also: tccgen.c: one more bitfield fix

1 files changed, 74 insertions, 0 deletions

diff --git a/tests/tests2/96_nodata_wanted.c b/tests/tests2/96_nodata_wanted.c
new file mode 100644
index 0000000..6f7f3c2
--- /dev/null
+++ b/tests/tests2/96_nodata_wanted.c
@@ -0,0 +1,74 @@
+/*****************************************************************************/
+/* test 'nodata_wanted' data output suppression */
+
+/*-* test 1: initializer not computable 1 */
+void foo() {
+    if (1) {
+	static short w = (int)&foo; /* error */
+    }
+}
+
+/*-* test 2: initializer not computable 2 */
+void foo() {
+    if (0) {
+	static short w = (int)&foo; /* error */
+    }
+}
+
+/*-* test 3: initializer not computable 3 */
+void foo();
+static short w = (int)&foo; /* error */
+
+
+/*-* test 4: 2 cast warnings */
+void foo() {
+    short w = &foo; /* no error */
+}
+
+/*-* test 5; nodata_wanted test */
+#include <stdio.h>
+
+#define DATA_LBL(s) \
+    __asm__(".global d"#s",t"#s"\n.data\nd"#s":\n.text\nt"#s":\n"); \
+    extern char d##s[],t##s[];
+
+#define PROG \
+        static void *p = (void*)&main;\
+        static char cc[] = "static string";\
+        static double d = 8.0;\
+        static struct __attribute__((packed)) {\
+            unsigned x : 12;\
+            unsigned char y : 7;\
+            unsigned z : 28, a: 4, b: 5;\
+        } s = { 0x333,0x44,0x555555,6,7 };\
+        printf("  static data: %d - %.1f - %.1f - %s - %s\n",\
+            sizeof 8.0, 8.0, d, __FUNCTION__, cc);\
+        printf("  static bitfields: %x %x %x %x %x\n", s.x, s.y, s.z, s.a, s.b);
+
+int main()
+{
+    printf("suppression off\n");
+    DATA_LBL(s1);
+    if (1) {
+        PROG
+    }
+    DATA_LBL(e1);
+    printf("  data length is %s\n", de1 - ds1 ? "not 0":"0");
+    //printf("  text length is %s\n", te1 - ts1 ? "not 0":"0");
+
+    printf("suppression on\n");
+    DATA_LBL(s2);
+    if (0) {
+        PROG
+    }
+    DATA_LBL(e2);
+    printf("  data length is %x\n", de2 - ds2);
+    //printf("  text length is %X\n", te2 - ts2);
+    return 0;
+}
+
+/*-* test 6: some test */
+int main()
+{
+    return 34;
+}