Encapsulate PassManager debug flags to avoid static init and cxa_exit.

This puts all the global PassManager debugging flags, like
-print-after-all and -time-passes, behind a managed static. This
eliminates their static initializers and, more importantly, exit-time
destructors.

The only behavioral change I anticipate is that tools need to
initialize the PassManager before parsing the command line in order to
export these options, which makes sense. Tools that already initialize
the standard passes (opt/llc) don't need to do anything new.

llvm-svn: 190974

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/tools/llvm-stress/llvm-stress.cpp b/llvm/tools/llvm-stress/llvm-stress.cpp
index 15f7abf70e9..6f2224221d8 100644
--- a/llvm/tools/llvm-stress/llvm-stress.cpp
+++ b/llvm/tools/llvm-stress/llvm-stress.cpp
@@ -681,6 +681,10 @@ void IntroduceControlFlow(Function *F, Random &R) {
 int main(int argc, char **argv) {
   // Init LLVM, call llvm_shutdown() on exit, parse args, etc.
   llvm::PrettyStackTraceProgram X(argc, argv);
+
+  // Initialize PassManager for -time-passes support.
+  initializePassManager();
+
   cl::ParseCommandLineOptions(argc, argv, "llvm codegen stress-tester\n");
   llvm_shutdown_obj Y;