Clean up more code

- Found some bugs in LLVM compiler-rt library
- The useless LIBC_STUBS package is now deleted
- Improve the overflow checking story even further
- Get chibicc tests working in MODE=dbg mode again
- The libc/isystem/ headers now have correctly named guards

third_party/zlib/deflate.c

@@ -957,10 +957,10 @@ int ZEXPORT deflate(strm, flush)
                      (s->gzhead->name == Z_NULL ? 0 : 8) +
                      (s->gzhead->comment == Z_NULL ? 0 : 16)
                      );
-            put_byte(s, (Byte)(s->gzhead->time & 0xff));
-            put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff));
-            put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff));
-            put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff));
+            put_byte(s, (Byte)(s->gzhead->time_ & 0xff));
+            put_byte(s, (Byte)((s->gzhead->time_ >> 8) & 0xff));
+            put_byte(s, (Byte)((s->gzhead->time_ >> 16) & 0xff));
+            put_byte(s, (Byte)((s->gzhead->time_ >> 24) & 0xff));
             put_byte(s, s->level == 9 ? 2 :
                      (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
                       4 : 0));

third_party/zlib/gz/gz.mk

@@ -24,7 +24,6 @@ THIRD_PARTY_ZLIB_GZ_A_DIRECTDEPS =		\
 	LIBC_NEXGEN32E				\
 	LIBC_STDIO				\
 	LIBC_STR				\
-	LIBC_STUBS				\
 	LIBC_SYSV				\
 	THIRD_PARTY_ZLIB
 

third_party/zlib/inflate.c

@@ -331,7 +331,6 @@ struct inflate_state FAR *state;
 #include "libc/stdio/dprintf.h"
 #include "libc/calls/weirdtypes.h"
 #include "libc/fmt/fmt.h"
-#include "libc/mem/fmt.h"
 #include "libc/stdio/stdio.h"
 #include "libc/stdio/temp.h"
 #include "third_party/musl/tempnam.h"
@@ -751,7 +750,7 @@ int flush;
         case TIME:
             NEEDBITS(32);
             if (state->head != Z_NULL)
-                state->head->time = hold;
+                state->head->time_ = hold;
             if ((state->flags & 0x0200) && (state->wrap & 4))
                 CRC4(state->check, hold);
             INITBITS();

third_party/zlib/trees.c

@@ -8,7 +8,6 @@
  */
 #include "libc/calls/calls.h"
 #include "libc/fmt/fmt.h"
-#include "libc/mem/fmt.h"
 #include "libc/stdio/lock.internal.h"
 #include "libc/stdio/stdio.h"
 #include "libc/stdio/temp.h"

third_party/zlib/zlib.h

@@ -171,7 +171,7 @@ typedef z_stream *z_streamp;
  */
 typedef struct gz_header_s {
   int text;       /* true if compressed data believed to be text */
-  uLong time;     /* modification time */
+  uLong time_;    /* modification time */
   int xflags;     /* extra flags (not used when writing a gzip file) */
   int os;         /* operating system */
   Bytef *extra;   /* pointer to extra field or Z_NULL if none */

third_party/zlib/zlib.mk

@@ -19,9 +19,8 @@ THIRD_PARTY_ZLIB_A_CHECKS =				\
 THIRD_PARTY_ZLIB_A_DIRECTDEPS =				\
 	LIBC_INTRIN					\
 	LIBC_NEXGEN32E					\
-	LIBC_SYSV					\
 	LIBC_STR					\
-	LIBC_STUBS
+	LIBC_SYSV
 
 THIRD_PARTY_ZLIB_A_DEPS :=				\
 	$(call uniq,$(foreach x,$(THIRD_PARTY_ZLIB_A_DIRECTDEPS),$($(x))))