Merge pull request #382 from rohany/debug-symbols

codegen: compile generated code with debug symbols in debug builds

Author: rohany

src/codegen/module.cpp

@@ -125,8 +125,15 @@ string Module::compile() {
   }
   else {
     cc = util::getFromEnv(target.compiler_env, target.compiler);
-    cflags = util::getFromEnv("TACO_CFLAGS",
-    "-O3 -ffast-math -std=c99") + " -shared -fPIC";
+#ifdef TACO_DEBUG
+    // In debug mode, compile the generated code with debug symbols and a
+    // low optimization level.
+    string defaultFlags = "-g -O0 -std=c99";
+#else
+    // Otherwise, use the standard set of optimizing flags.
+    string defaultFlags = "-O3 -ffast-math -std=c99";
+#endif
+    cflags = util::getFromEnv("TACO_CFLAGS", defaultFlags) + " -shared -fPIC";
 #if USE_OPENMP
     cflags += " -fopenmp";
 #endif

test/tests-qcd.cpp

@@ -34,7 +34,13 @@ TEST(qcd, mul1) {
   tau = z(i) * z(j) * theta(i,j) * theta(i,j);
 
   tau.evaluate();
+  // Using -O0 to compile the generated kernel yields a slightly different
+  // answer than using -O3.
+#ifdef TACO_DEBUG
+  ASSERT_DOUBLE_EQ(0.41212798763234648, getScalarValue(tau));
+#else
   ASSERT_DOUBLE_EQ(0.41212798763234737, getScalarValue(tau));
+#endif
 }
 
 TEST(qcd, mul2) {