From 95a5c97122b7c5bdeba61f2e890bae9a961dd4bf Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Wed, 8 Dec 2021 10:01:22 -0800
Subject: [PATCH] Disable LTO on clang/riscv

With clang in OE LTO does not work as it does not seem to carry right
target info and mixes ABIs

| Hard-float 'd' ABI can't be used for a target that doesn't support the D instruction set extension (ignoring target-abi)
| /mnt/b/yoe/master/build/tmp/work/riscv32-yoe-linux/tbb/1_2021.4.0-r0/recipe-sysroot-native/usr/bin/riscv32-yoe-linux/riscv32-yoe-linux-ld: /tmp/lto-llvm-3fb1bf.o: can't link soft-float modules with double-float modules
| /mnt/b/yoe/master/build/tmp/work/riscv32-yoe-linux/tbb/1_2021.4.0-r0/recipe-sysroot-native/usr/bin/riscv32-yoe-linux/riscv32-yoe-linux-ld: failed to merge target specific data of file /tmp/lto-llvm-3fb1bf.o

Upstream-Status: Inappropriate [ OE-Specific ]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 cmake/compilers/Clang.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/cmake/compilers/Clang.cmake
+++ b/cmake/compilers/Clang.cmake
@@ -60,7 +60,7 @@ endif()
 
 # Enabling LTO on Android causes the NDK bug.
 # NDK throws the warning: "argument unused during compilation: '-Wa,--noexecstack'"
-if (NOT ANDROID_PLATFORM AND BUILD_SHARED_LIBS)
+if (NOT ANDROID_PLATFORM AND BUILD_SHARED_LIBS AND NOT CMAKE_SYSTEM_PROCESSOR MATCHES "(riscv32|riscv64|arm)")
     set(TBB_IPO_COMPILE_FLAGS $<$<NOT:$<CONFIG:Debug>>:-flto>)
     set(TBB_IPO_LINK_FLAGS $<$<NOT:$<CONFIG:Debug>>:-flto>)
 endif()