execute_process: Add option to get results of every child

Add a `RESULTS_VARIABLE` option to get the results of all children
in a pipeline of one or more `COMMAND`s.

1 files changed, 30 insertions, 0 deletions

diff --git a/Tests/RunCMake/exit_code.c b/Tests/RunCMake/exit_code.c
new file mode 100644
index 0000000..3eba019
--- /dev/null
+++ b/Tests/RunCMake/exit_code.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Usage:
+//
+//  /path/to/program arg1 [arg2 [...]]
+//
+// Return EXIT_SUCCESS if 'zero_exit'
+// string was found in <arg1>.
+// Return EXIT_FAILURE if 'non_zero_exit'
+// string was found in <arg1>.
+
+int main(int argc, const char* argv[])
+{
+  const char* substring_failure = "non_zero_exit";
+  const char* substring_success = "zero_exit";
+  const char* str = argv[1];
+  if (argc < 2) {
+    return EXIT_FAILURE;
+  }
+  if (strcmp(str, substring_success) == 0) {
+    return EXIT_SUCCESS;
+  } else if (strcmp(str, substring_failure) == 0) {
+    return EXIT_FAILURE;
+  }
+  fprintf(stderr, "Failed to find string '%s' in '%s'\n", substring_success,
+          str);
+  return EXIT_FAILURE;
+}