[builtins] Get the builtins tests passing on Windows

Many things were broken:

- We stopped building most builtins on Windows in r261432 for reasons
  that are not at all clear to me. This essentially reverts that patch.

- Fix %librt to expand to clang_rt.builtins-$arch.lib on Windows instead
  of libclang_rt.builtins-$arch.a.

- Fix memory protection tests (trampoline, enable executable, clear
  cache) on Windows. One issue was that the MSVC incremental linker
  generates ILT thunks for functions with external linkage, so memcpying
  the functions into the executable stack buffer wasn't working. You
  can't memcpy an RIP-relative jump without fixing up the offset.

- Disable tests that rely on C99 complex library functions when using
  the MSVC CRT, which isn't compatible with clang's C99 _Complex.

In theory, these could all be separate patches, but it would not green
the tests, so let's try for it all at once. Hopefully this fixes the
clang-x64-ninja-win7 bot.

llvm-svn: 299780

1 files changed, 4 insertions, 28 deletions

diff --git a/compiler-rt/test/builtins/Unit/enable_execute_stack_test.c b/compiler-rt/test/builtins/Unit/enable_execute_stack_test.c
index 24165ed9fb7..72fc042e6dc 100644
--- a/compiler-rt/test/builtins/Unit/enable_execute_stack_test.c
+++ b/compiler-rt/test/builtins/Unit/enable_execute_stack_test.c
@@ -13,39 +13,14 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdint.h>
-#if defined(_WIN32)
-#include <windows.h>
-void __clear_cache(void* start, void* end)
-{
-    if (!FlushInstructionCache(GetCurrentProcess(), start, end-start))
-        exit(1);
-}
-void __enable_execute_stack(void *addr)
-{
-    MEMORY_BASIC_INFORMATION b;
-
-    if (!VirtualQuery(addr, &b, sizeof(b)))
-        exit(1);
-    if (!VirtualProtect(b.BaseAddress, b.RegionSize, PAGE_EXECUTE_READWRITE, &b.Protect))
-        exit(1);
-}
-#else
-#include <sys/mman.h>
 extern void __clear_cache(void* start, void* end);
 extern void __enable_execute_stack(void* addr);
-#endif
 
 typedef int (*pfunc)(void);
 
-int func1() 
-{
-    return 1;
-}
-
-int func2() 
-{
-    return 2;
-}
+// Make these static to avoid ILT jumps for incremental linking on Windows.
+static int func1() { return 1; }
+static int func2() { return 2; }
 
 void *__attribute__((noinline))
 memcpy_f(void *dst, const void *src, size_t n) {
@@ -69,6 +44,7 @@ int main()
     // verify you can copy and execute a function
     pfunc f1 = (pfunc)memcpy_f(execution_buffer, func1, 128);
     __clear_cache(execution_buffer, &execution_buffer[128]);
+    printf("f1: %p\n", f1);
     if ((*f1)() != 1)
         return 1;