[compiler-rt] CompilerRT: Normalize COMPILER_RT_DEFAULT_TARGET_TRIPLE (PR #88835)

[YunQiang Su via llvm-commits]

https://github.com/wzssyqa created https://github.com/llvm/llvm-project/pull/88835

If LLVM is configured with -DLLVM_DEFAULT_TARGET_TRIPLE, or compiler_rt is configured with -DCOMPILER_RT_DEFAULT_TARGET_TRIPLE, while the argument is not normalized, such as Debian-style vendor-less triple, clang will try to find libclang_rt in lib/<normalized_triple>, while libclang_rt is placed into lib/<triple_arg>.

Let's also place libclang_rt into lib/<normalized_triple>.

>From c5d45f8544148f4e368f5b6d5172ffe54fb669a8 Mon Sep 17 00:00:00 2001
From: YunQiang Su <syq at debian.org>
Date: Sun, 14 Apr 2024 23:16:52 +0800
Subject: [PATCH] CompilerRT: Normalize COMPILER_RT_DEFAULT_TARGET_TRIPLE

If LLVM is configured with -DLLVM_DEFAULT_TARGET_TRIPLE, or
compiler_rt is configured with -DCOMPILER_RT_DEFAULT_TARGET_TRIPLE,
while the argument is not normalized, such as Debian-style vendor-less
triple, clang will try to find libclang_rt in lib/<normalized_triple>,
while libclang_rt is placed into lib/<triple_arg>.

Let's also place libclang_rt into lib/<normalized_triple>.
---
 compiler-rt/cmake/Modules/CompilerRTUtils.cmake | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
index e8e5f612d5b03c..bd656049fd7208 100644
--- a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
+++ b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
@@ -363,9 +363,19 @@ macro(construct_compiler_rt_default_triple)
     endif()
     message(STATUS "cmake c compiler target: ${CMAKE_C_COMPILER_TARGET}")
     set(COMPILER_RT_DEFAULT_TARGET_TRIPLE ${CMAKE_C_COMPILER_TARGET})
+    if ("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
+      execute_process(COMMAND ${CMAKE_C_COMPILER} --target=${COMPILER_RT_DEFAULT_TARGET_TRIPLE} -print-effective-triple
+                      OUTPUT_VARIABLE COMPILER_RT_DEFAULT_TARGET_TRIPLE
+                      OUTPUT_STRIP_TRAILING_WHITESPACE)
+    endif()
   else()
     set(COMPILER_RT_DEFAULT_TARGET_TRIPLE ${LLVM_TARGET_TRIPLE} CACHE STRING
           "Default triple for which compiler-rt runtimes will be built.")
+    if ("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
+      execute_process(COMMAND ${CMAKE_C_COMPILER} --target=${COMPILER_RT_DEFAULT_TARGET_TRIPLE} -print-effective-triple
+                      OUTPUT_VARIABLE COMPILER_RT_DEFAULT_TARGET_TRIPLE
+                      OUTPUT_STRIP_TRAILING_WHITESPACE)
+    endif()
   endif()
 
   string(REPLACE "-" ";" LLVM_TARGET_TRIPLE_LIST ${COMPILER_RT_DEFAULT_TARGET_TRIPLE})