Homebrew formula of GDB with patch for OS X Yosemite. Only gdb 7.7 version works fine on OS X without any errors.

gdb.rb

require "formula"

class UniversalBrewedPython < Requirement
  satisfy { archs_for_command("python").universal? }

  def message; <<-EOS.undent
    A build of GDB using a brewed Python was requested, but Python is not
    a universal build.

    GDB requires Python to be built as a universal binary or it will fail
    if attempting to debug a 32-bit binary on a 64-bit host.
    EOS
  end
end

class Gdb < Formula
  homepage "http://www.gnu.org/software/gdb/"
  url "http://ftpmirror.gnu.org/gdb/gdb-7.7.1.tar.gz"
  mirror "http://ftp.gnu.org/gnu/gdb/gdb-7.7.1.tar.gz"
  sha1 "bb49bdb5781ea62ccdc2ec6869872e1b43168572"

  if MacOS.version >= "10.10"
    patch :DATA
  end

  depends_on "readline"

  if build.with? "brewed-python"
    depends_on UniversalBrewedPython
  end

  option "with-brewed-python", "Use the Homebrew version of Python"
  option "with-version-suffix", "Add a version suffix to program"

  def install
    args = [
      "--prefix=#{prefix}",
      "--disable-debug",
      "--disable-dependency-tracking",
      "--with-system-readline"
    ]

    if build.with? "brewed-python"
      args << "--with-python=#{HOMEBREW_PREFIX}"
    else
      args << "--with-python=/usr"
    end

    if build.with? "version-suffix"
      args << "--program-suffix=-#{version.to_s.slice(/^\d/)}"
    end

    system "./configure", *args
    system "make"
    system "make", "install"

    # Remove conflicting items with binutils
    rm_rf include
    rm_rf lib
    rm_rf share/"locale"

    # Conflicts with other GNU packages
    rm_f info/"standards.info"
  end

  def caveats; <<-EOS.undent
    gdb requires special privileges to access Mach ports.
    You will need to codesign the binary. For instructions, see:

      http://sourceware.org/gdb/wiki/BuildingOnDarwin
    EOS
  end
end

__END__
diff --git a/gdb/darwin-nat.c b/gdb/darwin-nat.c
index a21bb0f..3144dd4 100644
--- a/gdb/darwin-nat.c
+++ b/gdb/darwin-nat.c
@@ -42,7 +42,7 @@
 
 #include <sys/ptrace.h>
 #include <sys/signal.h>
-#include <machine/setjmp.h>
+#include <setjmp.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <signal.h>

This is to install gdb 7.7 version.
GNU gdb (GDB) 7.7.1

for anyone who ends up here and has no idea.
I don't know if this is the "proper" way to do it, but it worked for me:

I hit the "raw" button at the top and then copied the URL and pasted it into my terminal:
$ brew install "the_URL_you_copied"

I hope this helps
and thank you so much for writing this code, worked like a charm, once i found out how :-D

codesigned using this - http://stackoverflow.com/questions/13913818/how-to-get-a-codesigned-gdb-on-osx

After creating the certificate as described in the above link , do the below
codesign -f -s "gdb-cert" /usr/local/bin/gdb

Forked the above code from -
https://gist.github.com/ymyzk/10ad2b74af9235eddb2c