Stop setting LLVM_ON_WIN32 in config.h and llvm-config.h.

See thread "Replacing LLVM_ON_WIN32 with just _WIN32" on llvm-dev and cfe-dev.

I replaced all uses of LLVM_ON_WIN32 with _WIN32 in r331127 (llvm),
r331069 (clang), r329697 (lldb), r329696 (lld), r329696 (clang-tools-extra).

If your out-of-tree program used LLVM_ON_WIN32, just use _WIN32 instead, which
is set at exactly the same time to exactly the same value.

https://reviews.llvm.org/D46264


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331224 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/LLVMConfig.cmake.in

@@ -58,7 +58,6 @@ set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS @LLVM_EXPORT_SYMBOLS_FOR_PLUGINS@)
 set(LLVM_PLUGIN_EXT @LLVM_PLUGIN_EXT@)
 
 set(LLVM_ON_UNIX @LLVM_ON_UNIX@)
-set(LLVM_ON_WIN32 @LLVM_ON_WIN32@)
 
 set(LLVM_LIBDIR_SUFFIX @LLVM_LIBDIR_SUFFIX@)
 

docs/ReleaseNotes.rst

@@ -84,6 +84,9 @@ Non-comprehensive list of changes in this release
     ftrunc.c:5:15: runtime error: 4.29497e+09 is outside the range of representable values of type 'int'
     junk in the ftrunc: 0.000000
 
+* ``LLVM_ON_WIN32`` is no longer set by ``llvm/Config/config.h`` and
+  ``llvm/Config/llvm-config.h``.  If you used this macro, use the compiler-set
+  ``_WIN32`` instead which is set exactly when ``LLVM_ON_WIN32`` used to be set.
 
 * Note..
 

include/llvm/Config/config.h.cmake

@@ -311,9 +311,6 @@
 /* Define if this is Unixish platform */
 #cmakedefine LLVM_ON_UNIX ${LLVM_ON_UNIX}
 
-/* Define if this is Win32ish platform */
-#cmakedefine LLVM_ON_WIN32 ${LLVM_ON_WIN32}
-
 /* Define if overriding target triple is enabled */
 #cmakedefine LLVM_TARGET_TRIPLE_ENV "${LLVM_TARGET_TRIPLE_ENV}"
 

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

@@ -56,9 +56,6 @@
 /* Define if this is Unixish platform */
 #cmakedefine LLVM_ON_UNIX ${LLVM_ON_UNIX}
 
-/* Define if this is Win32ish platform */
-#cmakedefine LLVM_ON_WIN32 ${LLVM_ON_WIN32}
-
 /* Define if we have the Intel JIT API runtime support library */
 #cmakedefine01 LLVM_USE_INTEL_JITEVENTS