[runtimes] Use int main(int, char**) consistently in tests

This is needed when running the tests in Freestanding mode, where main()
isn't treated specially. In Freestanding, main() doesn't get mangled as
extern "C", so whatever runtime we're using fails to find the entry point.

One way to solve this problem is to define a symbol alias from __Z4mainiPPc
to _main, however this requires all definitions of main() to have the same
mangling. Hence this commit.

1 files changed, 2 insertions, 1 deletions

diff --git a/libunwind/test/unw_getcontext.pass.cpp b/libunwind/test/unw_getcontext.pass.cpp
index b012706a0bf9..a1f2baee12b4 100644
--- a/libunwind/test/unw_getcontext.pass.cpp
+++ b/libunwind/test/unw_getcontext.pass.cpp
@@ -1,8 +1,9 @@
 #include <assert.h>
 #include <libunwind.h>
 
-int main() {
+int main(int, char**) {
   unw_context_t context;
   int ret = unw_getcontext(&context);
   assert(ret == UNW_ESUCCESS);
+  return 0;
 }