Fix buildtool failures on non-bash shells and multi-target link/derived-dir handling

XCode/PBXFrameworksBuildPhase.m

@@ -229,6 +229,22 @@ - (NSString *) linkString
       linkString = [linkString stringByAppendingString: [NSString stringWithFormat: @"-L%@ ", lpath]];
     }
 
+  // Other targets' products (e.g. static libraries) live in build/<target>/Products.
+  NSArray *buildSubdirs = [manager contentsOfDirectoryAtPath: @"build" error: NULL];
+  en = [[buildSubdirs sortedArrayUsingSelector: @selector(compare:)] objectEnumerator];
+  while((lpath = [en nextObject]) != nil)
+    {
+      NSString *productsDir = [[@"build" stringByAppendingPathComponent: lpath]
+				stringByAppendingPathComponent: @"Products"];
+      BOOL isDir = NO;
+      if ([manager fileExistsAtPath: productsDir isDirectory: &isDir] && isDir
+	  && [productsDir isEqualToString: uninstalledProductsDir] == NO)
+	{
+	  linkString = [linkString stringByAppendingFormat: @"-L%@ ",
+				   [productsDir stringByEscapingSpecialCharacters]];
+	}
+    }
+
   en = [_files objectEnumerator];
   while((file = [en nextObject]) != nil)
     {

XCode/PBXNativeTarget.m

@@ -122,6 +122,9 @@ - (void) _productWrapper
               forKey: @"TARGET_BUILD_DIR"];
   [context setObject: aname
               forKey: @"TARGET_NAME"];
+  [context setObject: @"derived_src"
+              forKey: @"PROJECT_DERIVED_FILE_DIR"];
+  setenv("PROJECT_DERIVED_FILE_DIR","derived_src",1);
   [context setObject: uninstalledProductsDir
               forKey: @"BUILT_PRODUCTS_DIR"];
 

XCode/PBXShellScriptBuildPhase.m

@@ -152,7 +152,7 @@ - (NSString *) contextString
   NSString *k = nil;
 
   result = [result stringByAppendingString: @"set -eo pipefail\n"
-		   @"shopt -s inherit_errexit\n\n"];
+		   @"shopt -s inherit_errexit 2>/dev/null || true\n\n"];
 
   while ((k = [en nextObject]) != nil)
     {

XCode/xcsystem.m

@@ -91,7 +91,7 @@ NSInteger xcsystem(NSString *cmd)
     {
       NSString *scriptFormat = @"#!/bin/bash\n"
 	@"set -eo pipefail\n"
-	@"shopt -s inherit_errexit\n\n"
+	@"shopt -s inherit_errexit 2>/dev/null || true\n\n"
 	@"%@\n\n"
 	@"exit $?\n";
       NSString *body = @"";