Reduce absolute paths in generated ninja files

build/config/nacl/rules.gni

Index: build/config/nacl/rules.gni
diff --git a/build/config/nacl/rules.gni b/build/config/nacl/rules.gni
index c8956b4e6dae241d59ebf7810d4bf9a5ea0ae257..1c1a9121eb935ec7129982af0fed3746f916da03 100644
--- a/build/config/nacl/rules.gni
+++ b/build/config/nacl/rules.gni
@@ -74,14 +74,16 @@ template("generate_nmf") {
       # Starts empty so the code below can use += everywhere.
       data = []
 
-      nmfflags += [ "--library-path=" + rebase_path(root_out_dir) ]
+      nmfflags +=
+          [ "--library-path=" + rebase_path(root_out_dir, root_build_dir) ]
 
       # NOTE: There is no explicit dependency for the lib directory
       # (lib32 and lib64 for x86/x64) created in the product directory.
       # They are created as a side-effect of nmf creation.
       if (current_cpu != "x86" && current_cpu != "x64") {
         nmfflags +=
-            [ "--library-path=" + rebase_path("${nacl_toolchain_tooldir}/lib") ]
+            [ "--library-path=" +
+              rebase_path("${nacl_toolchain_tooldir}/lib", root_build_dir) ]
         if (current_cpu == "arm") {
           data += [ "${lib_path}/libarm/" ]
         } else {
@@ -90,8 +92,9 @@ template("generate_nmf") {
       } else {
         # For x86-32, the lib/ directory is called lib32/ instead.
         if (current_cpu == "x86") {
-          nmfflags += [ "--library-path=" +
-                        rebase_path("${nacl_toolchain_tooldir}/lib32") ]
+          nmfflags +=
+              [ "--library-path=" +
+                rebase_path("${nacl_toolchain_tooldir}/lib32", root_build_dir) ]
           data += [ "${lib_path}/lib32/" ]
         }
 
@@ -112,8 +115,9 @@ template("generate_nmf") {
                                          "root_out_dir")
           }
           nmfflags += [
-            "--library-path=" + rebase_path(x64_out_dir),
-            "--library-path=" + rebase_path("${nacl_toolchain_tooldir}/lib"),
+            "--library-path=" + rebase_path(x64_out_dir, root_build_dir),
+            "--library-path=" +
+                rebase_path("${nacl_toolchain_tooldir}/lib", root_build_dir),
           ]
           data += [ "${lib_path}/lib64/" ]
         }
@@ -121,7 +125,7 @@ template("generate_nmf") {
     }
     args = [
              "--no-default-libpath",
-             "--objdump=" + objdump,
+             "--objdump=" + rebase_path(objdump, root_build_dir),
              "--output=" + rebase_path(nmf, root_build_dir),
            ] + nmfflags + rebase_path(sources, root_build_dir)
     if (is_nacl_glibc && current_cpu == "arm") {