Polish recent changes and make improvements

- Simulate SIGPIPE on Windows NT
- Fix commandv() regression on Windows NT
- Fix sigprocmask() strace bug on OpenBSD
- Add many more system calls to --strace logging
- Make errno state more pristine in redbean strace

libc/log/addr2linepath.c

@@ -18,20 +18,6 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/log/log.h"
 
-static const char *__addr2line;
-
-static textstartup void __addr2line_init() {
-  static bool once;
-  if (!once) {
-    __addr2line = commandvenv("ADDR2LINE", "addr2line");
-    once = true;
-  }
-}
-
 const char *GetAddr2linePath(void) {
-  return __addr2line;
+  return commandvenv("ADDR2LINE", "addr2line");
 }
-
-const void *const __addr2line_ctor[] initarray = {
-    __addr2line_init,
-};

libc/log/backtrace2.c

@@ -76,13 +76,11 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
   }
 
   /*
-   * DWARF is a weak standard. If we build on Linux then only the
-   * precice same version of the same tools on Linux can be counted upon
-   * to work reliably. So if it's not Linux, we fall back to our builtin
-   * tooling which can be counted upon.
+   * DWARF is a weak standard. Platforms that use LLVM or old GNU
+   * usually can't be counted upon to print backtraces correctly.
    */
-  if (!IsLinux()) {
-    ShowHint("won't print addr2line backtrace on non-linux");
+  if (!IsLinux() /* && !IsWindows() */) {
+    ShowHint("won't print addr2line backtrace because probably llvm");
     return -1;
   }
 

libc/log/libfatal.internal.h

@@ -242,6 +242,20 @@ forceinline char *__strstr(const char *haystack, const char *needle) {
   return 0;
 }
 
+forceinline char16_t *__strstr16(const char16_t *haystack,
+                                 const char16_t *needle) {
+  size_t i;
+  for (;;) {
+    for (i = 0;; ++i) {
+      if (!needle[i]) return (/*unconst*/ char16_t *)haystack;
+      if (!haystack[i]) break;
+      if (needle[i] != haystack[i]) break;
+    }
+    if (!*haystack++) break;
+  }
+  return 0;
+}
+
 forceinline char *__getenv(char **p, const char *s) {
   size_t i, j;
   if (p) {