lib/std/build/RunStep.zig            | 72 ++++++++++++++++++++++++++++++++
 src/Compilation.zig                  | 13 ++++++
 src/libcxx.zig                       | 24 ++++++++---
 test/standalone/c_compiler/build.zig | 42 ++++++++++++-------
 test/standalone/c_compiler/test.c    | 23 +++++-----
 test/standalone/c_compiler/test.cpp  | 60 +++++++++++++++++++-------
 6 files changed, 189 insertions(+), 45 deletions(-)