Rename LLVM_MULTITHREADED define and fix build without threads.

Patch by Arrowdodger.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140064 91177308-0d34-0410-b5e6-96231b3b80d8

autoconf/configure.ac

@@ -1515,9 +1515,9 @@ AC_LINK_IFELSE(
     ]]),
   AC_LANG_POP([C++])
   AC_MSG_RESULT(yes)
-  AC_DEFINE(LLVM_MULTITHREADED, 1, Build multithreading support into LLVM),
+  AC_DEFINE(LLVM_HAS_ATOMICS, 1, Has gcc/MSVC atomic intrinsics),
   AC_MSG_RESULT(no)
-  AC_DEFINE(LLVM_MULTITHREADED, 0, Build multithreading support into LLVM)
+  AC_DEFINE(LLVM_HAS_ATOMICS, 0, Has gcc/MSVC atomic intrinsics)
   AC_MSG_WARN([LLVM will be built thread-unsafe because atomic builtins are missing]))
 
 dnl===-----------------------------------------------------------------------===

cmake/config-ix.cmake

@@ -272,7 +272,7 @@ else()
   unset(HAVE_FFI_CALL CACHE)
 endif( LLVM_ENABLE_FFI )
 
-# Define LLVM_MULTITHREADED if gcc atomic builtins exists.
+# Define LLVM_HAS_ATOMICS if gcc or MSVC atomic builtins are supported.
 include(CheckAtomic)
 
 if( LLVM_ENABLE_PIC )

cmake/modules/CheckAtomic.cmake

@@ -22,8 +22,8 @@ int main() {
 #endif
         return 0;
       }
-" LLVM_MULTITHREADED)
+" LLVM_HAS_ATOMICS)
 
-if( NOT LLVM_MULTITHREADED )
+if( NOT LLVM_HAS_ATOMICS )
   message(STATUS "Warning: LLVM will be built thread-unsafe because atomic builtins are missing")
 endif()

configure

@@ -21027,7 +21027,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 echo "${ECHO_T}yes" >&6; }
 
 cat >>confdefs.h <<\_ACEOF
-#define LLVM_MULTITHREADED 1
+#define LLVM_HAS_ATOMICS 1
 _ACEOF
 
 else
@@ -21038,7 +21038,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 echo "${ECHO_T}no" >&6; }
 
 cat >>confdefs.h <<\_ACEOF
-#define LLVM_MULTITHREADED 0
+#define LLVM_HAS_ATOMICS 0
 _ACEOF
 
   { echo "$as_me:$LINENO: WARNING: LLVM will be built thread-unsafe because atomic builtins are missing" >&5

include/llvm/Config/config.h.cmake

@@ -566,8 +566,8 @@
 /* Installation directory for man pages */
 #cmakedefine LLVM_MANDIR "${LLVM_MANDIR}"
 
-/* Build multithreading support into LLVM */
-#cmakedefine LLVM_MULTITHREADED ${LLVM_MULTITHREADED}
+/* Has gcc/MSVC atomic intrinsics */
+#define LLVM_HAS_ATOMICS ${LLVM_HAS_ATOMICS}
 
 /* LLVM architecture name for the native architecture, if available */
 #cmakedefine LLVM_NATIVE_ARCH ${LLVM_NATIVE_ARCH}

include/llvm/Config/config.h.in

@@ -564,8 +564,8 @@
 /* Installation directory for man pages */
 #undef LLVM_MANDIR
 
-/* Build multithreading support into LLVM */
-#undef LLVM_MULTITHREADED
+/* Has gcc/MSVC atomic intrinsics */
+#undef LLVM_HAS_ATOMICS
 
 /* LLVM architecture name for the native architecture, if available */
 #undef LLVM_NATIVE_ARCH

include/llvm/Config/llvm-config.h.cmake

@@ -46,8 +46,8 @@
 /* Installation directory for man pages */
 #cmakedefine LLVM_MANDIR "${LLVM_MANDIR}"
 
-/* Build multithreading support into LLVM */
-#cmakedefine LLVM_MULTITHREADED ${LLVM_MULTITHREADED}
+/* Has gcc/MSVC atomic intrinsics */
+#define LLVM_HAS_ATOMICS ${LLVM_HAS_ATOMICS}
 
 /* LLVM architecture name for the native architecture, if available */
 #cmakedefine LLVM_NATIVE_ARCH ${LLVM_NATIVE_ARCH}

include/llvm/Config/llvm-config.h.in

@@ -46,8 +46,8 @@
 /* Installation directory for man pages */
 #undef LLVM_MANDIR
 
-/* Build multithreading support into LLVM */
-#undef LLVM_MULTITHREADED
+/* Has gcc/MSVC atomic intrinsics */
+#undef LLVM_HAS_ATOMICS
 
 /* LLVM architecture name for the native architecture, if available */
 #undef LLVM_NATIVE_ARCH

lib/Support/Atomic.cpp

@@ -22,7 +22,7 @@ using namespace llvm;
 #endif
 
 void sys::MemoryFence() {
-#if LLVM_MULTITHREADED==0
+#if LLVM_HAS_ATOMICS == 0
   return;
 #else
 #  if defined(__GNUC__)
@@ -38,7 +38,7 @@ void sys::MemoryFence() {
 sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
                                   sys::cas_flag new_value,
                                   sys::cas_flag old_value) {
-#if LLVM_MULTITHREADED==0
+#if LLVM_HAS_ATOMICS == 0
   sys::cas_flag result = *ptr;
   if (result == old_value)
     *ptr = new_value;
@@ -53,7 +53,7 @@ sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
 }
 
 sys::cas_flag sys::AtomicIncrement(volatile sys::cas_flag* ptr) {
-#if LLVM_MULTITHREADED==0
+#if LLVM_HAS_ATOMICS == 0
   ++(*ptr);
   return *ptr;
 #elif defined(__GNUC__)
@@ -66,7 +66,7 @@ sys::cas_flag sys::AtomicIncrement(volatile sys::cas_flag* ptr) {
 }
 
 sys::cas_flag sys::AtomicDecrement(volatile sys::cas_flag* ptr) {
-#if LLVM_MULTITHREADED==0
+#if LLVM_HAS_ATOMICS == 0
   --(*ptr);
   return *ptr;
 #elif defined(__GNUC__)
@@ -79,7 +79,7 @@ sys::cas_flag sys::AtomicDecrement(volatile sys::cas_flag* ptr) {
 }
 
 sys::cas_flag sys::AtomicAdd(volatile sys::cas_flag* ptr, sys::cas_flag val) {
-#if LLVM_MULTITHREADED==0
+#if LLVM_HAS_ATOMICS == 0
   *ptr += val;
   return *ptr;
 #elif defined(__GNUC__)

lib/Support/Threading.cpp

@@ -24,7 +24,7 @@ static bool multithreaded_mode = false;
 static sys::Mutex* global_lock = 0;
 
 bool llvm::llvm_start_multithreaded() {
-#ifdef LLVM_MULTITHREADED
+#if ENABLE_THREADS != 0
   assert(!multithreaded_mode && "Already multithreaded!");
   multithreaded_mode = true;
   global_lock = new sys::Mutex(true);
@@ -39,7 +39,7 @@ bool llvm::llvm_start_multithreaded() {
 }
 
 void llvm::llvm_stop_multithreaded() {
-#ifdef LLVM_MULTITHREADED
+#if ENABLE_THREADS != 0
   assert(multithreaded_mode && "Not currently multithreaded!");
 
   // We fence here to insure that all threaded operations are complete BEFORE we
@@ -63,7 +63,7 @@ void llvm::llvm_release_global_lock() {
   if (multithreaded_mode) global_lock->release();
 }
 
-#if defined(LLVM_MULTITHREADED) && defined(HAVE_PTHREAD_H)
+#if ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H)
 #include <pthread.h>
 
 struct ThreadInfo {
@@ -102,7 +102,7 @@ void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
  error:
   ::pthread_attr_destroy(&Attr);
 }
-#elif defined(LLVM_MULTITHREADED) && defined(LLVM_ON_WIN32)
+#elif ENABLE_THREADS!=0 && defined(LLVM_ON_WIN32)
 #include "Windows/Windows.h"
 #include <process.h>