Define sigsetjmp and siglongjmp in musl and Remove the Emscripten patch in the setjmp.h

Author: google-yfyang

system/lib/libc/musl/include/setjmp.h

@@ -26,14 +26,9 @@ typedef struct __jmp_buf_tag {
  || defined(_BSD_SOURCE)
 typedef jmp_buf sigjmp_buf;
 /* XXX EMSCRIPTEN: No signals support, alias sigsetjmp and siglongjmp to their non-signals counterparts. */
-#if __EMSCRIPTEN__ && !defined(LLVM_LIBC)
-#define sigsetjmp(buf, x) setjmp((buf))
-#define siglongjmp(buf, val) longjmp(buf, val)
-#else
 int sigsetjmp (sigjmp_buf, int) __setjmp_attr;
 _Noreturn void siglongjmp (sigjmp_buf, int);
 #endif
-#endif
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)

system/lib/libc/musl/src/setjmp/longjmp.c

@@ -0,0 +1,5 @@
+#include <setjmp.h>
+
+_Noreturn void siglongjmp(jmp_buf buf, int val) {
+   longjmp(buf, val);
+}

system/lib/libc/musl/src/setjmp/setjmp.c

@@ -0,0 +1,5 @@
+#include <setjmp.h>
+
+int sigsetjmp(jmp_buf sigjmp_buf, int savesigs) {
+    return setjmp(sigjmp_buf);
+}

system/lib/libc/musl/src/setjmp/siglongjmp.c

@@ -1024,6 +1024,7 @@ def get_files(self):
 
 
 class libc(MuslInternalLibrary,
+           libcompiler_rt,
            DebugLibrary,
            AsanInstrumentedLibrary,
            MTLibrary):
@@ -1136,7 +1137,7 @@ def get_files(self):
     # musl modules
     ignore = [
         'ipc', 'passwd', 'signal', 'sched', 'time', 'linux',
-        'aio', 'exit', 'legacy', 'mq', 'setjmp',
+        'aio', 'exit', 'legacy', 'mq',
         'ldso', 'malloc',
     ]
 
@@ -1365,6 +1366,7 @@ def get_files(self):
         filenames=['thread_profiler.c'])
 
     libc_files += glob_in_path('system/lib/libc/compat', '*.c')
+    libc_files += glob_in_path('system/lib/libc/musl/setjmp', '*.c')
 
     # Check for missing file in non_lto_files list.  Do this here
     # rather than in the constructor so it only happens when the