Fixed a problem where we couldn't call extern "C" functions.

Some compilers do not mark up C++ functions as extern "C" in the DWARF, so LLDB
has to fall back (if it is about to give up finding a symbol) to using the base
name of the function.

This fix also ensures that we search by full name rather than "auto," which
could cause unrelated C++ names to be found.  Finally, it adds a test case.

<rdar://problem/25094302>

llvm-svn: 271551

3 files changed, 36 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/Makefile b/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/Makefile
new file mode 100644
index 00000000000..cd9ca5c86d8
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/Makefile
@@ -0,0 +1,3 @@
+LEVEL = ../../../make
+C_SOURCES := main.c
+include $(LEVEL)/Makefile.rules
diff --git a/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/TestExternCSymbols.py b/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/TestExternCSymbols.py
new file mode 100644
index 00000000000..f08c0dcbda9
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/TestExternCSymbols.py
@@ -0,0 +1,4 @@
+from lldbsuite.test import lldbinline
+from lldbsuite.test import decorators
+
+lldbinline.MakeInlineTest(__file__, globals(), [])
diff --git a/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/main.cpp b/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/main.cpp
new file mode 100644
index 00000000000..a4006c2f7ed
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/lang/cpp/extern_c/main.cpp
@@ -0,0 +1,29 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdio.h>
+#include <stdint.h>
+
+extern "C"
+{
+   int foo();
+};
+
+int foo()
+{
+    puts("foo");
+    return 2;
+}
+
+int main (int argc, char const *argv[], char const *envp[])
+{          
+    foo();
+    return 0; //% self.expect("expression -- foo()", substrs = ['2'])
+}
+