lib/std/Build/Step/Compile.zig         |  18 ++++
 lib/std/Build/Step/InstallArtifact.zig |  18 ++++
 lib/std/zig.zig                        |   4 +
 src/codegen/x86_64/CodeGen.zig         | 174 +++++++++++++++++++++++++-------
 test/behavior/var_args.zig             |  58 ++++++++++-
 5 files changed, 228 insertions(+), 44 deletions(-)