• Steven Rostedt's avatar
    kbuild: create new CFLAGS_REMOVE_(basename).o option · 656ee82c
    Steven Rostedt authored
    
    
    We currently have a way to add special CFLAGS to code, but we do not have a
    way to remove them if needed.
    
    With the case of ftrace, some files should simply not be profiled. Adding
    the -pg flag to these files is simply a waste, and adding "notrace" to each
    and every function is ugly.
    
    Currently we put in "Makefile turd" [1] to stop the compiler from adding -pg
    to certain files. This was clumsy and awkward.
    
    This patch now adds the revese of CFLAGS_(basename).o with
    CFLAGS_REMOVE_(basename).o.  This allows developers to prevent certain
    CFLAGS from being used to compile files. For example, we can now do
    
    CFLAGS_REMOVE_string.o = -pg
    
    to remove the -pg option from the string.o file in the lib directory.
    
    Note: a space delimited list of options may be added to the REMOVE macro.
    
    [1] - what David Miller called the workaronud to remove -pg
    
    Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    656ee82c