lib/std/Build/EmulatableRunStep.zig         |  4 +-
 lib/std/Build/RunStep.zig                   | 83 +++++++++++++++++++++-----------
 lib/std/os.zig                              | 18 +++++++
 lib/std/start.zig                           |  1 +
 lib/std/std.zig                             | 16 ++++++
 test/link/macho/dead_strip_dylibs/build.zig |  2 +-
 test/src/compare_output.zig                 |  2 +-
 test/standalone.zig                         |  3 ++
 test/standalone/sigpipe/breakpipe.zig       | 21 ++++++++
 test/standalone/sigpipe/build.zig           | 35 ++++++++++++++
 10 files changed, 153 insertions(+), 32 deletions(-)