Exit if using --libc=uclibc and KLEE was not configured with uclibc

or if the configured path does not exist.

Previously if KLEE was configured and compiled without uclibc linking
would still succeed because KLEE_UCLIBC was blank so LLVM was
effectively asked to link with "/lib/libc.a" i.e. the system's native
C library!

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/klee/main.cpp b/tools/klee/main.cpp
index 922f8bb5..769be28e 100644
--- a/tools/klee/main.cpp
+++ b/tools/klee/main.cpp
@@ -30,6 +30,7 @@
 #include "llvm/Instructions.h"
 #if LLVM_VERSION_CODE >= LLVM_VERSION(2, 7)
 #include "llvm/LLVMContext.h"
+#include "llvm/Support/FileSystem.h"
 #endif
 #endif
 #if LLVM_VERSION_CODE < LLVM_VERSION(2, 7)
@@ -1013,6 +1014,12 @@ static void replaceOrRenameFunction(llvm::Module *module,
 }
 
 static llvm::Module *linkWithUclibc(llvm::Module *mainModule) {
+  // Ensure that KLEE_UCLIBC exists
+  bool uclibcRootExists=false;
+  llvm::sys::fs::is_directory(KLEE_UCLIBC, uclibcRootExists);
+  if (!uclibcRootExists)
+    klee_error("Cannot link with uclibc. KLEE_UCLIBC (\"" KLEE_UCLIBC "\") is not a directory.");
+
   Function *f;
   // force import of __uClibc_main
   mainModule->getOrInsertFunction("__uClibc_main",