commit b1b791a55aee901366e9d096dae167a708c4254d
Author: Romaric Jodin <rjodin@chromium.org>
Date:   Mon Apr 25 10:19:15 2022 +0200

    Revert "loader: Check for processor of compiler, not processor of build system"

    This reverts commit db5e3d0f454f063db7b4505e4d08b759f1874bbb.

    ```
    loader: Check for processor of compiler, not processor of build system
    If we are cross-compiling, for example for aarch64 on x86, then the
    compiler we care about here is the machine we are compiling *for*,
    e.g. aarch64 (the "target" in CMake terminology, the "host system" in
    Autotools/Meson) rather than the machine we are compiling *on*, e.g. x86
    (the "host" in CMake terminology, the "build system" in Autotools/Meson).

    Signed-off-by: Simon McVittie <smcv@collabora.com>
    ```

    This commit made compiling for trogdor64 fail. Reverting it allow to keep to
    same behavior as before vulkan-loader update. But the compilation produces a
    warning message for a potential issue (already pthere before):

    ```
    Could not find working x86_64 GAS assembler

    The build will fall back on building with C code

    Note that this may be unsafe, as the C code requires tail-call
    optimizations to remove the stack frame for certain calls.  If the compiler
    does not do this, then unknown device extensions will suffer from a
    corrupted stack.
    ```

    This is a know issue track in:
    https://github.com/KhronosGroup/Vulkan-Loader/issues/249

diff --git a/loader/CMakeLists.txt b/loader/CMakeLists.txt
index a2baca20b..4255cb953 100644
--- a/loader/CMakeLists.txt
+++ b/loader/CMakeLists.txt
@@ -181,12 +181,12 @@ else() # i.e.: Linux
         set(CMAKE_ASM_FLAGS "${CMAKE_C_FLAGS}")
         set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
 
-        if (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "aarch64")
+        if (${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "aarch64")
             try_compile(ASSEMBLER_WORKS ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/asm_test_aarch64.S)
             if(ASSEMBLER_WORKS)
                 set(OPT_LOADER_SRCS ${OPT_LOADER_SRCS} unknown_ext_chain_gas_aarch64.S)
             endif()
-        elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64" OR ${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "^i.86$")
+        elseif(${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "x86_64" OR ${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "x86" OR ${CMAKE_HOST_SYSTEM_PROCESSOR} MATCHES "^i.86$")
             check_include_file("cet.h" HAVE_CET_H)
             if(HAVE_CET_H)
                 target_compile_definitions(loader_specific_options INTERFACE HAVE_CET_H)
@@ -206,7 +206,7 @@ else() # i.e.: Linux
         add_custom_target(loader_asm_gen_files DEPENDS gen_defines.asm)
     else()
         if(USE_GAS)
-            message(WARNING "Could not find working ${CMAKE_SYSTEM_PROCESSOR} GAS assembler\n${ASM_FAILURE_MSG}")
+            message(WARNING "Could not find working ${CMAKE_HOST_SYSTEM_PROCESSOR} GAS assembler\n${ASM_FAILURE_MSG}")
         else()
             message(WARNING "Assembly sources have been disabled\n${ASM_FAILURE_MSG}")
         endif()