Add more fixes for new cosmocc toolchain

We now have an `#include <cxxabi.h>` header which defines all the APIs
Cosmopolitan's implemented so far. The `cosmocc` README.md file is now
greatly expanded with documentation.

libc/calls/raise.c

@@ -34,15 +34,19 @@
  *
  * Note `SIG_DFL` still results in process death for most signals.
  *
+ * POSIX defines raise() errors as returning non-zero and makes setting
+ * `errno` optional. Every platform we've tested in our support vector
+ * returns -1 with `errno` on error (like a normal system call).
+ *
  * @param sig can be SIGALRM, SIGINT, SIGTERM, SIGKILL, etc.
- * @return 0 on success, or nonzero on failure
+ * @return 0 on success, or -1 w/ errno
  * @raise EINVAL if `sig` is invalid
  * @asyncsignalsafe
  */
 int raise(int sig) {
   int rc;
   if (IsXnuSilicon()) {
-    rc = __syslib->__raise(sig);
+    rc = _sysret(__syslib->__raise(sig));
   } else if (IsWindows()) {
     if (0 <= sig && sig <= 64) {
       __sig_raise(sig, SI_TKILL);

libc/cxxabi.h

@@ -0,0 +1,17 @@
+#ifndef _CXXABI_H
+#define _CXXABI_H
+COSMOPOLITAN_C_START_
+
+union CxaGuardValue;
+
+char *__cxa_demangle(const char *, char *, size_t *, int *);
+int __cxa_atexit(void (*)(void *), void *, void *) paramsnonnull((1)) dontthrow;
+int __cxa_guard_acquire(union CxaGuardValue *);
+int __cxa_thread_atexit(void *, void *, void *) dontthrow;
+void __cxa_finalize(void *);
+void __cxa_guard_abort(union CxaGuardValue *) dontthrow;
+void __cxa_guard_release(union CxaGuardValue *) dontthrow;
+void __cxa_pure_virtual(void) wontreturn;
+
+COSMOPOLITAN_C_END_
+#endif /* _CXXABI_H */

libc/dns/gethoststxt.c

@@ -17,6 +17,7 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
+#include "libc/cxxabi.h"
 #include "libc/dce.h"
 #include "libc/dns/hoststxt.h"
 #include "libc/dns/servicestxt.h"
@@ -64,7 +65,7 @@ const struct HostsTxt *GetHostsTxt(void) {
     init->ht.entries.p = init->entries;
     init->ht.strings.n = pushpop(ARRAYLEN(init->strings));
     init->ht.strings.p = init->strings;
-    __cxa_atexit(FreeHostsTxt, &g_hoststxt, NULL);
+    __cxa_atexit((void *)FreeHostsTxt, &g_hoststxt, NULL);
     if ((f = fopen(GetHostsTxtPath(pathbuf, sizeof(pathbuf)), "r"))) {
       if (ParseHostsTxt(g_hoststxt, f) == -1) {
         /* TODO(jart): Elevate robustness. */

libc/dns/getresolvconf.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/cxxabi.h"
 #include "libc/dce.h"
 #include "libc/dns/resolvconf.h"
 #include "libc/fmt/fmt.h"
@@ -48,7 +49,7 @@ const struct ResolvConf *GetResolvConf(void) {
     g_resolvconf = &init->rv;
     pushmov(&init->rv.nameservers.n, ARRAYLEN(init->nameservers));
     init->rv.nameservers.p = init->nameservers;
-    __cxa_atexit(FreeResolvConf, &g_resolvconf, NULL);
+    __cxa_atexit((void *)FreeResolvConf, &g_resolvconf, NULL);
     if (!IsWindows()) {
       if ((f = fopen("/etc/resolv.conf", "r"))) {
         rc = ParseResolvConf(g_resolvconf, f);

libc/intrin/atexit.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/cxxabi.h"
 #include "libc/runtime/runtime.h"
 
 /**
@@ -29,5 +30,5 @@
  * @return 0 on success or nonzero if out of space
  */
 int atexit(void f(void)) {
-  return __cxa_atexit(f, 0, 0);
+  return __cxa_atexit((void *)f, 0, 0);
 }

libc/intrin/cxaatexit.internal.h

@@ -23,7 +23,6 @@ void __cxa_lock(void);
 void __cxa_unlock(void);
 void __cxa_thread_finalize(void);
 void __cxa_printexits(FILE *, void *);
-int __cxa_thread_atexit(void *, void *, void *);
 int __cxa_thread_atexit_impl(void *, void *, void *);
 
 COSMOPOLITAN_C_END_

libc/intrin/describebacktrace.c

@@ -20,7 +20,7 @@
 #include "libc/log/libfatal.internal.h"
 #include "libc/nexgen32e/stackframe.h"
 
-#define N 100
+#define N 160
 
 dontinstrument const char *(DescribeBacktrace)(char buf[N],
                                                struct StackFrame *fr) {

libc/intrin/describebacktrace.internal.h

@@ -5,8 +5,8 @@
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 COSMOPOLITAN_C_START_
 
-const char *DescribeBacktrace(char[100], struct StackFrame *);
-#define DescribeBacktrace(x) DescribeBacktrace(alloca(100), x)
+const char *DescribeBacktrace(char[160], struct StackFrame *);
+#define DescribeBacktrace(x) DescribeBacktrace(alloca(160), x)
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */

libc/isystem/cxxabi.h

@@ -0,0 +1 @@
+#include "libc/cxxabi.h"

libc/log/leaks.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/cxxabi.h"
 #include "libc/dce.h"
 #include "libc/intrin/asan.internal.h"
 #include "libc/intrin/bits.h"

libc/log/oncrash_arm64.c

@@ -30,6 +30,7 @@
 #include "libc/calls/struct/utsname.h"
 #include "libc/calls/syscall-sysv.internal.h"
 #include "libc/calls/ucontext.h"
+#include "libc/cxxabi.h"
 #include "libc/errno.h"
 #include "libc/intrin/describebacktrace.internal.h"
 #include "libc/intrin/describeflags.internal.h"

libc/runtime/cxaguard.c

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 #include "libc/atomic.h"
+#include "libc/cxxabi.h"
 #include "libc/intrin/atomic.h"
 #include "libc/limits.h"
 #include "third_party/nsync/futex.internal.h"

libc/runtime/exit.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/cxxabi.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/intrin/weaken.h"
 #include "libc/runtime/internal.h"

libc/runtime/internal.h

@@ -36,7 +36,6 @@ int ftrace_init(void);
 void ftrace_hook(void);
 void __morph_tls(void);
 void __enable_tls(void);
-void *__cxa_finalize(void *);
 void __stack_chk_fail(void) wontreturn relegated;
 void __stack_chk_fail_local(void) wontreturn relegated;
 long _setstack(void *, void *, ...);

libc/runtime/runtime.h

@@ -36,7 +36,6 @@ void _exit(int) libcesque wontreturn;
 void _Exit(int) libcesque wontreturn;
 void quick_exit(int) wontreturn;
 void abort(void) wontreturn;
-int __cxa_atexit(void *, void *, void *) paramsnonnull((1)) libcesque;
 int atexit(void (*)(void)) paramsnonnull() libcesque;
 char *getenv(const char *) paramsnonnull() __wur nosideeffect libcesque;
 int putenv(char *);

libc/stdio/demangle.c

@@ -27,6 +27,7 @@
 │ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.            │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/assert.h"
+#include "libc/cxxabi.h"
 #include "libc/errno.h"
 #include "libc/fmt/conv.h"
 #include "libc/fmt/fmt.h"

libc/stdio/fflush_unlocked.c

@@ -17,6 +17,7 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
+#include "libc/cxxabi.h"
 #include "libc/errno.h"
 #include "libc/intrin/bits.h"
 #include "libc/intrin/pushpop.internal.h"
@@ -111,7 +112,7 @@ textstartup int __fflush_register(FILE *f) {
   if (!sf->handles.p) {
     sf->handles.p = sf->handles_initmem;
     pushmov(&sf->handles.n, ARRAYLEN(sf->handles_initmem));
-    __cxa_atexit(fflush_unlocked, 0, 0);
+    __cxa_atexit((void *)fflush_unlocked, 0, 0);
   }
   for (i = sf->handles.i; i; --i) {
     if (!sf->handles.p[i - 1]) {

libc/stdio/stdio.h

@@ -180,12 +180,6 @@ int fprintf_unlocked(FILE *, const char *, ...) printfesque(2)
 int vfprintf_unlocked(FILE *, const char *, va_list)
     paramsnonnull() dontthrow nocallback;
 
-/*───────────────────────────────────────────────────────────────────────────│─╗
-│ cosmopolitan § cxxabi                                                    ─╬─│┼
-╚────────────────────────────────────────────────────────────────────────────│*/
-
-char *__cxa_demangle(const char *, char *, size_t *, int *);
-
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 #endif /* COSMOPOLITAN_LIBC_STDIO_H_ */

libc/thread/pthread_exit.c

@@ -18,6 +18,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/assert.h"
 #include "libc/atomic.h"
+#include "libc/cxxabi.h"
 #include "libc/dce.h"
 #include "libc/intrin/atomic.h"
 #include "libc/intrin/cxaatexit.internal.h"

libc/thread/tls.h

@@ -38,7 +38,7 @@ struct CosmoTib {
   uint32_t tib_sigstack_flags;
   void **tib_keys;
   void *tib_nsync;
-  void *tib_todo[63];
+  void *tib_todo[7];
 };
 
 extern int __threaded;

libc/time/localtime.c

@@ -4,6 +4,7 @@
 #define LOCALTIME_IMPLEMENTATION
 #include "libc/calls/blockcancel.internal.h"
 #include "libc/calls/calls.h"
+#include "libc/cxxabi.h"
 #include "libc/intrin/bits.h"
 #include "libc/mem/gc.h"
 #include "libc/mem/mem.h"