GN: Allow setting the path to Python

tools/gn/switches.cc

Index: tools/gn/switches.cc
diff --git a/tools/gn/switches.cc b/tools/gn/switches.cc
index 45b25e6240f2e7dbfc0a2b8ec11a621cc1ea685b..c8b42564a4faf16fab8b457c8f6c2d6743236a21 100644
--- a/tools/gn/switches.cc
+++ b/tools/gn/switches.cc
@@ -103,6 +103,16 @@ const char kNoColor_HelpShort[] =
     "--nocolor: Force non-colored output.";
 const char kNoColor_Help[] = COLOR_HELP_LONG;
 
+const char kScriptExecutable[] = "script-executable";
+const char kScriptExecutable_HelpShort[] =
+    "--script-executable: Set the executable used to execute scripts.";
+const char kScriptExecutable_Help[] =
+    "--script-executable: Set the executable used to execute scripts.\n"
+    "\n"
+    "  By default GN uses Python to execute scripts in action targets and\n"

[brettw, 2016/05/13 17:03:44]

Can you change this to:

By default GN searches the PATH for Python to execute scripts in action targets
and exec_script calls. This flag allows the specification of a specific Python
executable or potentially a different language interpreter.

[Petr Hosek, 2016/05/13 18:13:47]

Done.

+    "  exec_scripts function invocations. This flag allows using a custom\n"
+    "  executable.\n";
+
 const char kQuiet[] = "q";
 const char kQuiet_HelpShort[] =
     "-q: Quiet mode. Don't print output on success.";