From 97fa63c09b5e50bc353b702de011e36f76577dad Mon Sep 17 00:00:00 2001
From: Kyle Edwards <kyle.edwards@kitware.com>
Date: Mon, 1 Jun 2020 14:31:10 -0400
Subject: ASM: Fix preprocessor definition flags for GNU 'as' tool

Fixes: #20780
---
 Modules/Compiler/GNU-ASM.cmake           | 1 +
 Tests/RunCMake/BuildDepends/GNU-AS.cmake | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Modules/Compiler/GNU-ASM.cmake b/Modules/Compiler/GNU-ASM.cmake
index 3daa57d..94af401 100644
--- a/Modules/Compiler/GNU-ASM.cmake
+++ b/Modules/Compiler/GNU-ASM.cmake
@@ -9,4 +9,5 @@ if(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_MATCH STREQUAL "GNU assembler")
   set(CMAKE_DEPFILE_FLAGS_ASM${ASM_DIALECT} "--MD <DEPFILE>")
   set(CMAKE_ASM${ASM_DIALECT}_LINK_EXECUTABLE
     "<CMAKE_LINKER> <FLAGS> <CMAKE_ASM${ASM_DIALECT}_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
+  set(CMAKE_ASM_DEFINE_FLAG "--defsym ")
 endif()
diff --git a/Tests/RunCMake/BuildDepends/GNU-AS.cmake b/Tests/RunCMake/BuildDepends/GNU-AS.cmake
index 21921ef..0c7249a 100644
--- a/Tests/RunCMake/BuildDepends/GNU-AS.cmake
+++ b/Tests/RunCMake/BuildDepends/GNU-AS.cmake
@@ -5,6 +5,7 @@ message(STATUS "CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_MATCH='${CMAKE_ASM${A
 
 add_library(gnu_as STATIC gnu_as.s)
 target_include_directories(gnu_as PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+target_compile_definitions(gnu_as PRIVATE "TEST_DEF=Hello")
 
 file(GENERATE OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/check-$<LOWER_CASE:$<CONFIG>>.cmake CONTENT "
 set(check_pairs
-- 
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