[llvm] r292216 - BrainF example: fixing output buffering issue

[Boris Ulasevich via llvm-commits]

Author: bulasevich
Date: Tue Jan 17 07:27:28 2017
New Revision: 292216

URL: http://llvm.org/viewvc/llvm-project?rev=292216&view=rev
Log:
BrainF example: fixing output buffering issue
Differential Revision: https://reviews.llvm.org/D27824

Modified:
    llvm/trunk/examples/BrainF/BrainFDriver.cpp

Modified: llvm/trunk/examples/BrainF/BrainFDriver.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/BrainF/BrainFDriver.cpp?rev=292216&r1=292215&r2=292216&view=diff
==============================================================================
--- llvm/trunk/examples/BrainF/BrainFDriver.cpp (original)
+++ llvm/trunk/examples/BrainF/BrainFDriver.cpp Tue Jan 17 07:27:28 2017
@@ -166,6 +166,10 @@ int main(int argc, char **argv) {
     std::vector<GenericValue> args;
     Function *brainf_func = M.getFunction("brainf");
     GenericValue gv = ee->runFunction(brainf_func, args);
+    // Genereated code calls putchar, and output is not guaranteed without fflush.
+    // The better place for fflush(stdout) call would be the generated code, but it
+    // is unmanageable because stdout linkage name depends on stdlib implementation.
+    fflush(stdout);
   } else {
     WriteBitcodeToFile(Mod.get(), *out);
   }