[PATCH 03/10] ftrace: allow building without frame pointers
From: rostedt@goodmis.org (Steven Rostedt)
Date: 2010-02-23 13:47:04
Also in:
lkml
On Sun, 2010-02-14 at 01:18 +0530, Rabin Vincent wrote:
quoted hunk ↗ jump to hunk
With current gcc, compiling with both -pg and -fomit-frame-pointer is not allowed. However, -pg can be used to build without actually specying -fno-omit-frame-pointer, upon which the defaut behaviour for the target will be used. On ARM, it is not possible to build a Thumb-2 kernel with -fno-omit-frame-pointer (FRAME_POINTERS depends on !THUMB2_KERNEL). In order to support ftrace for Thumb-2, we need to be able to allow a combination of FUNCTION_TRACER and !FRAME_POINTER. We do this by omitting -fomit-frame-pointer if ftrace is enabled. Signed-off-by: Rabin Vincent <redacted> --- Makefile | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)diff --git a/Makefile b/Makefile index 67d6cff..72d90de 100644 --- a/Makefile +++ b/Makefile@@ -546,8 +546,11 @@ endif ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls else +ifndef CONFIG_FUNCTION_TRACER
Is this needed? Selecting FUNCTION_TRACER also selects FRAME_POINTER, which this change is in the else part of that #if. -- Steve
+# -fomit-frame-pointer is incompatible with -pg KBUILD_CFLAGS += -fomit-frame-pointer endif +endif ifdef CONFIG_DEBUG_INFO KBUILD_CFLAGS += -g