preparation for clang format (#5422)

* Clang-format excludes

* Add .clang-format

* Don't clang-format in external

* Missing includes and forward declarations

* Replace wonky include-once macro name

* neaten include naming

* Add clang-format to formatting script

* Add xargs and diff to required binaries

* add clang-format to ci formatting check

* Add max version check to formatting script

* temporarily disable checking formatting for cpp files

3 files changed, 31 insertions, 20 deletions

diff --git a/source/compiler-core/slang-artifact-desc-util.cpp b/source/compiler-core/slang-artifact-desc-util.cpp
index 907a953ce..7c2622f70 100644
--- a/source/compiler-core/slang-artifact-desc-util.cpp
+++ b/source/compiler-core/slang-artifact-desc-util.cpp
@@ -154,6 +154,7 @@ bool isDerivedFrom(ENUM_TYPE kind, ENUM_TYPE base) { return g_table##ENUM_TYPE.i
 
 /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!! ArtifactKind !!!!!!!!!!!!!!!!!!!!!!! */
 
+// clang-format off
 #define SLANG_ARTIFACT_KIND(x) \
     x(Invalid, Invalid) \
     x(Base, Invalid) \
@@ -245,6 +246,7 @@ SLANG_HIERARCHICAL_ENUM(ArtifactPayload, SLANG_ARTIFACT_PAYLOAD, SLANG_ARTIFACT_
             x(Kernel, CodeLike) \
             x(Host, CodeLike) \
         x(Obfuscated, Base) 
+// clang-format on
 
 #define SLANG_ARTIFACT_STYLE_ENTRY(TYPE, PARENT) { Index(ArtifactStyle::TYPE), Index(ArtifactStyle::PARENT), #TYPE },
 
diff --git a/source/compiler-core/slang-dxc-compiler.cpp b/source/compiler-core/slang-dxc-compiler.cpp
index 3a949b3bd..30bf71968 100644
--- a/source/compiler-core/slang-dxc-compiler.cpp
+++ b/source/compiler-core/slang-dxc-compiler.cpp
@@ -37,26 +37,33 @@
 // generate code on Windows.
 #if SLANG_ENABLE_DXIL_SUPPORT
 
-#   ifdef _WIN32
-#       include <windows.h>
-#       include <unknwn.h>
-#       include "../../external/dxc/dxcapi.h"
-#   else
-#       include "../../external/dxc/dxcapi.h"
-
-#       ifdef __uuidof
-            // DXC's WinAdapter.h defines __uuidof(T) over types, but the existing
-            // usage in this file is over values (both are accepted on MSVC.)
-            // We also need to decay through Slang::ComPtr, hence the helper struct
-            template <typename T>
-            struct StripSlangComPtr { using type = T; };
-            template <typename T>
-            struct StripSlangComPtr<Slang::ComPtr<T>> { using type = T; };
-#           undef __uuidof
-#           define __uuidof(x) __emulated_uuidof<StripSlangComPtr<std::decay_t<decltype(x)>>::type>()
-#       endif
-#   endif
-
+#    ifdef _WIN32
+#        include <unknwn.h>
+#        include <windows.h>
+#    endif
+
+#    include "../../external/dxc/dxcapi.h"
+
+#    ifndef _WIN32
+#        ifdef __uuidof
+// DXC's WinAdapter.h defines __uuidof(T) over types, but the existing
+// usage in this file is over values (both are accepted on MSVC.)
+// We also need to decay through Slang::ComPtr, hence the helper struct
+template<typename T>
+struct StripSlangComPtr
+{
+    using type = T;
+};
+template<typename T>
+struct StripSlangComPtr<Slang::ComPtr<T>>
+{
+    using type = T;
+};
+#            undef __uuidof
+#            define __uuidof(x) \
+                __emulated_uuidof<StripSlangComPtr<std::decay_t<decltype(x)>>::type>()
+#        endif
+#    endif
 #endif
 
 namespace Slang
diff --git a/source/compiler-core/slang-nvrtc-compiler.cpp b/source/compiler-core/slang-nvrtc-compiler.cpp
index 80fde277b..8e234e634 100644
--- a/source/compiler-core/slang-nvrtc-compiler.cpp
+++ b/source/compiler-core/slang-nvrtc-compiler.cpp
@@ -41,6 +41,7 @@ typedef enum {
 
 typedef struct _nvrtcProgram *nvrtcProgram;
 
+// clang-format off
 #define SLANG_NVRTC_FUNCS(x) \
     x(const char*, nvrtcGetErrorString, (nvrtcResult result)) \
     x(nvrtcResult, nvrtcVersion, (int *major, int *minor)) \
@@ -53,6 +54,7 @@ typedef struct _nvrtcProgram *nvrtcProgram;
     x(nvrtcResult, nvrtcGetProgramLog, (nvrtcProgram prog, char *log))\
     x(nvrtcResult, nvrtcAddNameExpression, (nvrtcProgram prog, const char * const name_expression)) \
     x(nvrtcResult, nvrtcGetLoweredName, (nvrtcProgram prog, const char *const name_expression, const char** lowered_name))
+// clang-format on
 
 } // namespace nvrtc