Fix most MSVC warnings in compiler-rt profiling library

Here's the warnings and how they were fixed:

- InstrProfilingUtil.c(110): warning C4013: '_open_osfhandle' undefined; assuming extern returning int

Include io.h to get the prototype.

- warning C4005: 'FILE_MAP_EXECUTE': macro redefinition

Stop trying to support pre-XP versions of Windows, don't attempt to
define this macro.

- InstrProfilingWriter.c(271): warning C4221: nonstandard extension used: 'Data': cannot be initialized using address of automatic variable 'Header'
- InstrProfilingWriter.c(275): warning C4221: nonstandard extension used: 'Data': cannot be initialized using address of automatic variable 'Zeroes'

Turn this warning off. This is definitely legal in C++, all compilers
accept it, and I only have room for half of one language standard in my
brain.

- InstrProfilingValue.c(320): warning C4113: 'uint32_t (__cdecl *)()' differs in parameter lists from 'uint32_t (__cdecl *)(void)'

Fix this with an explicit (void) in the prototype.

- InstrProfilingMerge.c.obj : warning LNK4006: _VPMergeHook already defined in InstrProfilingMergeFile.c.obj; second definition ignored

Last remaining warning. This is from linking a selectany definition with
a strong definition. We need to sort out weak symbols in compiler-rt in
general, though.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@273026 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 10 insertions, 8 deletions

diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index bcedcfc6a..a9dcd7e7c 100644
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -60,6 +60,7 @@ check_cxx_compiler_flag(/W4 COMPILER_RT_HAS_W4_FLAG)
 check_cxx_compiler_flag(/WX COMPILER_RT_HAS_WX_FLAG)
 check_cxx_compiler_flag(/wd4146 COMPILER_RT_HAS_WD4146_FLAG)
 check_cxx_compiler_flag(/wd4291 COMPILER_RT_HAS_WD4291_FLAG)
+check_cxx_compiler_flag(/wd4221 COMPILER_RT_HAS_WD4221_FLAG)
 check_cxx_compiler_flag(/wd4391 COMPILER_RT_HAS_WD4391_FLAG)
 check_cxx_compiler_flag(/wd4722 COMPILER_RT_HAS_WD4722_FLAG)
 check_cxx_compiler_flag(/wd4800 COMPILER_RT_HAS_WD4800_FLAG)
diff --git a/lib/profile/CMakeLists.txt b/lib/profile/CMakeLists.txt
index 996f3beaf..79e5508ac 100644
--- a/lib/profile/CMakeLists.txt
+++ b/lib/profile/CMakeLists.txt
@@ -77,6 +77,11 @@ if(COMPILER_RT_TARGET_HAS_FCNTL_LCK)
      -DCOMPILER_RT_HAS_FCNTL_LCK=1)
 endif()
 
+# This appears to be a C-only warning banning the use of locals in aggregate
+# initializers. All other compilers accept this, though.
+# nonstandard extension used : 'identifier' : cannot be initialized using address of automatic variable
+append_list_if(COMPILER_RT_HAS_WD4221_FLAG /wd4221 EXTRA_FLAGS)
+
 if(APPLE)
   add_compiler_rt_runtime(clang_rt.profile
     STATIC
diff --git a/lib/profile/InstrProfilingPort.h b/lib/profile/InstrProfilingPort.h
index 17509c124..4fd8aca4a 100644
--- a/lib/profile/InstrProfilingPort.h
+++ b/lib/profile/InstrProfilingPort.h
@@ -13,6 +13,7 @@
 #ifdef _MSC_VER
 #define COMPILER_RT_ALIGNAS(x) __declspec(align(x))
 #define COMPILER_RT_VISIBILITY
+/* FIXME: selectany does not have the same semantics as weak. */
 #define COMPILER_RT_WEAK __declspec(selectany)
 /* Need to include <windows.h> */
 #define COMPILER_RT_ALLOCA _alloca
diff --git a/lib/profile/InstrProfilingUtil.c b/lib/profile/InstrProfilingUtil.c
index e87ab7640..be1012117 100644
--- a/lib/profile/InstrProfilingUtil.c
+++ b/lib/profile/InstrProfilingUtil.c
@@ -12,6 +12,7 @@
 
 #ifdef _WIN32
 #include <direct.h>
+#include <io.h>
 #include <windows.h>
 #else
 #include <sys/stat.h>
diff --git a/lib/profile/InstrProfilingValue.c b/lib/profile/InstrProfilingValue.c
index b6a982dcb..93957e323 100644
--- a/lib/profile/InstrProfilingValue.c
+++ b/lib/profile/InstrProfilingValue.c
@@ -309,7 +309,7 @@ static ValueProfNode *getNextNValueData(uint32_t VK, uint32_t Site,
   return VNode;
 }
 
-static uint32_t getValueProfDataSizeWrapper() {
+static uint32_t getValueProfDataSizeWrapper(void) {
   return getValueProfDataSize(&RTRecordClosure);
 }
 
diff --git a/lib/profile/WindowsMMap.h b/lib/profile/WindowsMMap.h
index 7b94eb282..271619aea 100644
--- a/lib/profile/WindowsMMap.h
+++ b/lib/profile/WindowsMMap.h
@@ -21,13 +21,7 @@
  */
 #define PROT_READ     0x1
 #define PROT_WRITE    0x2
-/* This flag is only available in WinXP+ */
-#ifdef FILE_MAP_EXECUTE
-#define PROT_EXEC     0x4
-#else
-#define PROT_EXEC        0x0
-#define FILE_MAP_EXECUTE 0
-#endif
+#define PROT_EXEC     0x0
 
 #define MAP_FILE      0x00
 #define MAP_SHARED    0x01