toolchain: x86: Broken -Os detection in ia32.cmake

Fix followup problems after laguage-correct zephyr COMPILE_OPTIONS

Signed-off-by: Björn Bergman <[email protected]>

Author: bjorniuppsala

arch/x86/ia32.cmake

@@ -3,7 +3,10 @@
 
 # Find out if we are optimizing for size
 get_target_property(zephyr_COMPILE_OPTIONS zephyr_interface INTERFACE_COMPILE_OPTIONS)
-if ("-Os" IN_LIST zephyr_COMPILE_OPTIONS)
+#Any -Os is (or may be) wraped in $<COMPILE_LANGUAGE> guards
+list(FILTER zephyr_COMPILE_OPTIONS INCLUDE REGEX "-Os")
+list(LENGTH zephyr_COMPILE_OPTIONS have_os)
+if (${have_os} GREATER 0)
   zephyr_cc_option(-mpreferred-stack-boundary=2)
 else()
   zephyr_compile_definitions(PERF_OPT)