Tests: fix failures with gnu mode clang on windows

    Root causes were:
    * Using incorrect conditions (assuming MSVC-like command line mode)
    * Trying to compile the MSVC STL in C++11 mode, when parts of it require
      C++14 or enabling MS extensions in clang.
    * Missing flush in a testcase using stdout in a dll and a main part
    with static crt

2 files changed, 2 insertions, 0 deletions

diff --git a/Tests/RunCMake/Ninja/greeting.c b/Tests/RunCMake/Ninja/greeting.c
index ba3e55beb0..1124d14c0f 100644
--- a/Tests/RunCMake/Ninja/greeting.c
+++ b/Tests/RunCMake/Ninja/greeting.c
@@ -6,4 +6,5 @@ __declspec(dllexport)
   void greeting(void)
 {
   printf("Hello world!\n");
+  fflush(stdout);
 }
diff --git a/Tests/RunCMake/Ninja/greeting2.c b/Tests/RunCMake/Ninja/greeting2.c
index c6ed87daa0..cc8409c117 100644
--- a/Tests/RunCMake/Ninja/greeting2.c
+++ b/Tests/RunCMake/Ninja/greeting2.c
@@ -3,4 +3,5 @@
 void greeting2(void)
 {
   printf("Hello world 2!\n");
+  fflush(stdout);
 }