libphobos: Remove unused variables in gcc.backtrace.

The core.runtime module always overrides the default parameter value for
constructor calls.  MaxAlignment is not required because a class can be
created on the stack with the `scope' keyword.

libphobos/ChangeLog:

	* libdruntime/core/runtime.d (runModuleUnitTests): Use scope to new
	LibBacktrace on the stack.
	* libdruntime/gcc/backtrace.d (FIRSTFRAME): Remove.
	(LibBacktrace.MaxAlignment): Remove.
	(LibBacktrace.this): Remove default initialization of firstFrame.
	(UnwindBacktrace.this): Likewise.

1 files changed, 2 insertions, 22 deletions

diff --git a/libphobos/libdruntime/gcc/backtrace.d b/libphobos/libdruntime/gcc/backtrace.d
index 8f5582d..3c4d65f 100644
--- a/libphobos/libdruntime/gcc/backtrace.d
+++ b/libphobos/libdruntime/gcc/backtrace.d
@@ -24,24 +24,6 @@ module gcc.backtrace;
 
 import gcc.libbacktrace;
 
-version (Posix)
-{
-    // NOTE: The first 5 frames with the current implementation are
-    //       inside core.runtime and the object code, so eliminate
-    //       these for readability.  The alternative would be to
-    //       exclude the first N frames that are in a list of
-    //       mangled function names.
-    private enum FIRSTFRAME = 5;
-}
-else
-{
-    // NOTE: On Windows, the number of frames to exclude is based on
-    //       whether the exception is user or system-generated, so
-    //       it may be necessary to exclude a list of function names
-    //       instead.
-    private enum FIRSTFRAME = 0;
-}
-
 // Max size per line of the traceback.
 private enum MAX_BUFSIZE = 1536;
 
@@ -205,8 +187,6 @@ static if (BACKTRACE_SUPPORTED && !BACKTRACE_USES_MALLOC)
     // FIXME: state is never freed as libbacktrace doesn't provide a free function...
     public class LibBacktrace : Throwable.TraceInfo
     {
-        enum MaxAlignment = (void*).alignof;
-
         static void initLibBacktrace()
         {
             if (!initialized)
@@ -216,7 +196,7 @@ static if (BACKTRACE_SUPPORTED && !BACKTRACE_USES_MALLOC)
             }
         }
 
-        this(int firstFrame = FIRSTFRAME)
+        this(int firstFrame)
         {
             _firstFrame = firstFrame;
 
@@ -365,7 +345,7 @@ else
      */
     public class UnwindBacktrace : Throwable.TraceInfo
     {
-        this(int firstFrame = FIRSTFRAME)
+        this(int firstFrame)
         {
             _firstFrame = firstFrame;
             _callstack = getBacktrace();