From efe84ec41a0905dd980d309cec2f9c1583af8c34 Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Mon, 2 Dec 2024 19:42:45 +0200
Subject: [PATCH] [UCRT] Add "aliases" for some hacked clang builtins

---
 sdk/lib/ucrt/stdlib/clang-hacks.s | 32 +++++++++++++++++++++++++++++++
 sdk/lib/ucrt/stdlib/stdlib.cmake  |  7 +++++++
 2 files changed, 39 insertions(+)
 create mode 100644 sdk/lib/ucrt/stdlib/clang-hacks.s

diff --git a/sdk/lib/ucrt/stdlib/clang-hacks.s b/sdk/lib/ucrt/stdlib/clang-hacks.s
new file mode 100644
index 00000000000..6c85fe9021a
--- /dev/null
+++ b/sdk/lib/ucrt/stdlib/clang-hacks.s
@@ -0,0 +1,32 @@
+
+#include <asm.inc>
+
+#ifdef _M_IX86
+.code
+#define SYM(name) _##name
+#else
+.code64
+#define SYM(name) name
+#endif
+
+MACRO(CREATE_ALIAS, alias, target)
+    EXTERN SYM(&target):PROC
+    PUBLIC SYM(&alias)
+    SYM(&alias):
+        jmp SYM(&target)
+ENDM
+
+    #undef _lrotl
+    CREATE_ALIAS _lrotl, ___lrotl
+    #undef _lrotr
+    CREATE_ALIAS _lrotr, ___lrotr
+    #undef _rotl
+    CREATE_ALIAS _rotl, ___rotl
+    #undef _rotl64
+    CREATE_ALIAS _rotl64, ___rotl64
+    #undef _rotr
+    CREATE_ALIAS _rotr, ___rotr
+    #undef _rotr64
+    CREATE_ALIAS _rotr64, ___rotr64
+
+END
diff --git a/sdk/lib/ucrt/stdlib/stdlib.cmake b/sdk/lib/ucrt/stdlib/stdlib.cmake
index fafbad26ea6..0558de48ace 100644
--- a/sdk/lib/ucrt/stdlib/stdlib.cmake
+++ b/sdk/lib/ucrt/stdlib/stdlib.cmake
@@ -22,3 +22,10 @@ list(APPEND UCRT_STDLIB_SOURCES
     stdlib/rotl.cpp
     stdlib/rotr.cpp
 )
+
+if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
+    add_asm_files(UCRT_STRING_ASM stdlib/clang-hacks.s)
+    list(APPEND UCRT_STDLIB_SOURCES
+        ${UCRT_STRING_ASM}
+    )
+endif()