Bug 350245 - "Updater.app forgets to reload the main app under Rosetta if it was originally launched with translation". r=mento.

toolkit/mozapps/update/src/updater/launchchild_osx.mm

@@ -38,6 +38,12 @@
 
 #include <Cocoa/Cocoa.h>
 
+#ifdef __ppc__
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <mach/machine.h>
+#endif /* __ppc__ */
+
 void LaunchChild(int argc, char **argv)
 {
   int i;
@@ -45,6 +51,31 @@ void LaunchChild(int argc, char **argv)
   NSMutableArray *args = [[NSMutableArray alloc] init];
   NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 
+#ifdef __ppc__
+  // It's possible that the app is a universal binary running under Rosetta
+  // translation because the user forced it to.  Relaunching via NSTask would
+  // launch the app natively, which the user apparently doesn't want.
+  // In that case, try to preserve translation.
+
+  // If the sysctl doesn't exist, it's because Rosetta doesn't exist,
+  // so don't try to force translation.  In case of other errors, just assume
+  // that the app is native.
+
+  int isNative = 0;
+  size_t sz = sizeof(isNative);
+
+  if (sysctlbyname("sysctl.proc_native", &isNative, &sz, NULL, 0) == 0 &&
+      !isNative) {
+    // Running translated on ppc.
+
+    cpu_type_t preferredCPU = CPU_TYPE_POWERPC;
+    sysctlbyname("sysctl.proc_exec_affinity", NULL, NULL,
+                 &preferredCPU, sizeof(preferredCPU));
+
+    // Nothing can be done to handle failure, relaunch anyway.
+  }
+#endif /* __ppc__ */
+
   for (i = 1; i < argc; ++i)
     [args addObject: [NSString stringWithCString: argv[i]]];