Move away from add_link_options to support building with older CMake …

…versions.

This is required to support being inserted into distro packages: see dotnet/runtime#38755

eng/common/cross/toolchain.cmake

@@ -127,29 +127,40 @@ endif()
 
 # Specify link flags
 
+function(add_toolchain_linker_flag Flag)
+  set(Config "${ARGV1}")
+  set(CONFIG_SUFFIX "")
+  if (NOT Config STREQUAL "")
+    set(CONFIG_SUFFIX "_${Config}")
+  endif()
+  set("CMAKE_EXE_LINKER_FLAGS${CONFIG_SUFFIX}" "${CMAKE_EXE_LINKER_FLAGS${CONFIG_SUFFIX}} ${Flag}" PARENT_SCOPE)
+  set("CMAKE_SHARED_LINKER_FLAGS${CONFIG_SUFFIX}" "${CMAKE_SHARED_LINKER_FLAGS${CONFIG_SUFFIX}} ${Flag}" PARENT_SCOPE)
+endfunction()
+
+
 if(TARGET_ARCH_NAME STREQUAL "armel")
   if(DEFINED TIZEN_TOOLCHAIN) # For Tizen only
-    add_link_options("-B${CROSS_ROOTFS}/usr/lib/gcc/${TIZEN_TOOLCHAIN}")
-    add_link_options("-L${CROSS_ROOTFS}/lib")
-    add_link_options("-L${CROSS_ROOTFS}/usr/lib")
-    add_link_options("-L${CROSS_ROOTFS}/usr/lib/gcc/${TIZEN_TOOLCHAIN}")
+    add_toolchain_linker_flag("-B${CROSS_ROOTFS}/usr/lib/gcc/${TIZEN_TOOLCHAIN}")
+    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/lib")
+    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/usr/lib")
+    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/usr/lib/gcc/${TIZEN_TOOLCHAIN}")
   endif()
 elseif(TARGET_ARCH_NAME STREQUAL "arm64")
   if(DEFINED TIZEN_TOOLCHAIN) # For Tizen only
-    add_link_options("-B${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}")
-    add_link_options("-L${CROSS_ROOTFS}/lib64")
-    add_link_options("-L${CROSS_ROOTFS}/usr/lib64")
-    add_link_options("-L${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}")
-
-    add_link_options("-Wl,--rpath-link=${CROSS_ROOTFS}/lib64")
-    add_link_options("-Wl,--rpath-link=${CROSS_ROOTFS}/usr/lib64")
-    add_link_options("-Wl,--rpath-link=${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}")
+    add_toolchain_linker_flag("-B${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}")
+    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/lib64")
+    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/usr/lib64")
+    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}")
+
+    add_toolchain_linker_flag("-Wl,--rpath-link=${CROSS_ROOTFS}/lib64")
+    add_toolchain_linker_flag("-Wl,--rpath-link=${CROSS_ROOTFS}/usr/lib64")
+    add_toolchain_linker_flag("-Wl,--rpath-link=${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}")
   endif()
 elseif(TARGET_ARCH_NAME STREQUAL "x86")
-  add_link_options(-m32)
+  add_toolchain_linker_flag(-m32)
 elseif(ILLUMOS)
-   add_link_options("-L${CROSS_ROOTFS}/lib/amd64")
-   add_link_options("-L${CROSS_ROOTFS}/usr/amd64/lib")
+  add_toolchain_linker_flag("-L${CROSS_ROOTFS}/lib/amd64")
+  add_toolchain_linker_flag("-L${CROSS_ROOTFS}/usr/amd64/lib")
 endif()
 
 # Specify compile options