From 7ca30134dd44466c62d5dc7f26974efd335d1df8 Mon Sep 17 00:00:00 2001

From: Arseny Maslennikov <arseny@altlinux.org>

Date: Tue, 31 Aug 2021 17:26:49 +0300

Subject: [PATCH] cmake: pass -ffat-lto-objects if using the GNU toolchain

We build and install static libraries.

ALT's process-lto brp disallows us to package objects with __gnu_lto_slim,

so we pass -ffat-lto-objects if GNU toolchain is used.

---

 llvm/cmake/modules/HandleLLVMOptions.cmake | 3 +++

 1 file changed, 3 insertions(+)

diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake

index 5d4d692a7..b438f48a5 100644

--- a/cmake/modules/HandleLLVMOptions.cmake

+++ b/cmake/modules/HandleLLVMOptions.cmake

@@ -1029,6 +1029,10 @@

   endif()

 elseif(LLVM_ENABLE_LTO)

   append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)

+  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")

+    message(STATUS "ALT: Using GNU toolchain to compile LLVM with LTO enabled, so we ask it to produce fat objects.")

+    append("-ffat-lto-objects" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)

+  endif()

   if(NOT LINKER_IS_LLD_LINK)

     append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)

   endif()

-- 

2.32.0