Don't ignore return value from getcwd()

Makefile

@@ -25,7 +25,8 @@ BUILD_VERSION=$(shell git log --abbrev-commit --abbrev=16 | head -1)
 
 CXX=g++
 CPP=cpp
-CXXFLAGS=-g3 $(LLVM_CXXFLAGS) -I. -Iobjs/ -Wall $(LLVM_VERSION_DEF) \
+OPT=-g3
+CXXFLAGS=$(OPT) $(LLVM_CXXFLAGS) -I. -Iobjs/ -Wall $(LLVM_VERSION_DEF) \
 	-DBUILD_DATE="\"$(BUILD_DATE)\"" -DBUILD_VERSION="\"$(BUILD_VERSION)\""
 
 LDFLAGS=

ispc.cpp

@@ -353,7 +353,8 @@ Globals::Globals() {
 #ifdef ISPC_IS_WINDOWS
     _getcwd(currentDirectory, sizeof(currentDirectory));
 #else
-    getcwd(currentDirectory, sizeof(currentDirectory));
+    if (getcwd(currentDirectory, sizeof(currentDirectory)) == NULL)
+        FATAL("Current directory path too long!");
 #endif
 }