kbuild: test dead code/data elimination support in Kconfig

This config option should be enabled only when both the compiler and
the linker support necessary flags.  Add proper dependencies to Kconfig.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 9bd50ba8253f..21b855921eaf 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1085,6 +1085,8 @@ config LD_DEAD_CODE_DATA_ELIMINATION
         bool "Dead code and data elimination (EXPERIMENTAL)"
         depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION
         depends on EXPERT
+        depends on $(cc-option,-ffunction-sections -fdata-sections)
+        depends on $(ld-option,--gc-sections)
         help
           Enable this if you want to do dead code and data elimination with
           the linker by compiling with -ffunction-sections -fdata-sections,