Re: [PATCH 0/7] gcov kernel support

[Peter Oberparleiter]

Andrew Morton wrote:
> On Mon, 19 May 2008 10:42:54 +0200 Peter Oberparleiter <peter.oberparleiter@xxxxxxxxxx> wrote:
> 
>> This is version #2 of the gcov kernel support patch set
> 
> powerpc blew up:
> 
> /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/gcc/powerpc64-unknown-linux-gnu/4.1.0/../../../../powerpc64-unknown-linux-gnu/bin/ld: skipping incompatible /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/gcc/powerpc64-unknown-linux-gnu/4.1.0/./libgcov.a when searching for -lgcov
> /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/gcc/powerpc64-unknown-linux-gnu/4.1.0/../../../../powerpc64-unknown-linux-gnu/bin/ld: cannot find -lgcov
> collect2: ld returned 1 exit status
> make[2]: *** [arch/powerpc/kernel/vdso32/vdso32.so.dbg] Error 1
> make[1]: *** [arch/powerpc/kernel/vdso32] Error 2

This looks like a secondary linking process. It's best to exclude the
whole directory from GCOV profiling (which should ony work for C files
anyway).

Below is an update for patch #7 of the gcov series that includes the
corresponding changes.

---

[PATCH 7/7] gcov: architecture specific compile flag adjustments

From: Peter Oberparleiter <peter.oberparleiter@xxxxxxxxxx>

Exclude code from profiling which is not linked to the main kernel or
which is running in a context not compatible with the assumptions made
by gcc's profiling code.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@xxxxxxxxxx>
---
 arch/arm/boot/compressed/Makefile      |    1 +
 arch/powerpc/kernel/vdso32/Makefile    |    1 +
 arch/powerpc/kernel/vdso64/Makefile    |    1 +
 arch/ppc/boot/Makefile                 |    1 +
 arch/ppc/boot/common/Makefile          |    1 +
 arch/ppc/boot/simple/Makefile          |    1 +
 arch/x86/boot/Makefile                 |    1 +
 arch/x86/boot/compressed/Makefile      |    1 +
 arch/x86/kernel/acpi/realmode/Makefile |    1 +
 9 files changed, 9 insertions(+)

Index: linux-2.6.26-rc3/arch/arm/boot/compressed/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/arm/boot/compressed/Makefile
+++ linux-2.6.26-rc3/arch/arm/boot/compressed/Makefile
@@ -7,6 +7,7 @@
 HEAD	= head.o
 OBJS	= misc.o
 FONTC	= $(srctree)/drivers/video/console/font_acorn_8x8.c
+GCOV	:= n
 
 #
 # Architecture dependencies
Index: linux-2.6.26-rc3/arch/x86/boot/compressed/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/x86/boot/compressed/Makefile
+++ linux-2.6.26-rc3/arch/x86/boot/compressed/Makefile
@@ -12,6 +12,7 @@ cflags-$(CONFIG_X86_64) := -mcmodel=smal
 KBUILD_CFLAGS += $(cflags-y)
 KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
 KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
+GCOV := n
 
 KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
 
Index: linux-2.6.26-rc3/arch/ppc/boot/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/ppc/boot/Makefile
+++ linux-2.6.26-rc3/arch/ppc/boot/Makefile
@@ -16,6 +16,7 @@
 # KBUILD_CFLAGS used when building rest of boot (takes effect recursively)
 KBUILD_CFLAGS 	+= -fno-builtin -D__BOOTER__ -Iarch/$(ARCH)/boot/include
 HOSTCFLAGS	+= -Iarch/$(ARCH)/boot/include
+GCOV		:= n
 
 BOOT_TARGETS	= zImage zImage.initrd znetboot znetboot.initrd
 
Index: linux-2.6.26-rc3/arch/ppc/boot/common/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/ppc/boot/common/Makefile
+++ linux-2.6.26-rc3/arch/ppc/boot/common/Makefile
@@ -5,6 +5,7 @@
 # Tom Rini	January 2001
 #
 
+GCOV := n
 lib-y					:= string.o util.o misc-common.o \
 						serial_stub.o bootinfo.o
 lib-$(CONFIG_SERIAL_8250_CONSOLE)	+= ns16550.o
Index: linux-2.6.26-rc3/arch/ppc/boot/simple/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/ppc/boot/simple/Makefile
+++ linux-2.6.26-rc3/arch/ppc/boot/simple/Makefile
@@ -21,6 +21,7 @@
 # XXX_memory.o file for this to work, as well as editing the
 # misc-$(CONFIG_MACHINE) variable.
 
+GCOV				:= n
 boot				:= arch/ppc/boot
 common				:= $(boot)/common
 utils				:= $(boot)/utils
Index: linux-2.6.26-rc3/arch/x86/boot/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/x86/boot/Makefile
+++ linux-2.6.26-rc3/arch/x86/boot/Makefile
@@ -71,6 +71,7 @@ KBUILD_CFLAGS	:= $(LINUXINCLUDE) -g -Os 
 		   $(call cc-option, -mpreferred-stack-boundary=2)
 KBUILD_CFLAGS +=   $(call cc-option,-m32)
 KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__
+GCOV		:= n
 
 $(obj)/zImage:  IMAGE_OFFSET := 0x1000
 $(obj)/zImage:  asflags-y := $(SVGA_MODE) $(RAMDISK)
Index: linux-2.6.26-rc3/arch/x86/kernel/acpi/realmode/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/x86/kernel/acpi/realmode/Makefile
+++ linux-2.6.26-rc3/arch/x86/kernel/acpi/realmode/Makefile
@@ -42,6 +42,7 @@ KBUILD_CFLAGS	:= $(LINUXINCLUDE) -g -Os 
 		   $(call cc-option, -mpreferred-stack-boundary=2)
 KBUILD_CFLAGS	+= $(call cc-option, -m32)
 KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__
+GCOV		:= n
 
 WAKEUP_OBJS = $(addprefix $(obj)/,$(wakeup-y))
 
Index: linux-2.6.26-rc3/arch/powerpc/kernel/vdso32/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/powerpc/kernel/vdso32/Makefile
+++ linux-2.6.26-rc3/arch/powerpc/kernel/vdso32/Makefile
@@ -17,6 +17,7 @@ EXTRA_CFLAGS := -shared -fno-common -fno
 EXTRA_CFLAGS += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
 		$(call ld-option, -Wl$(comma)--hash-style=sysv)
 EXTRA_AFLAGS := -D__VDSO32__ -s
+GCOV := n
 
 obj-y += vdso32_wrapper.o
 extra-y += vdso32.lds
Index: linux-2.6.26-rc3/arch/powerpc/kernel/vdso64/Makefile
===================================================================
--- linux-2.6.26-rc3.orig/arch/powerpc/kernel/vdso64/Makefile
+++ linux-2.6.26-rc3/arch/powerpc/kernel/vdso64/Makefile
@@ -11,6 +11,7 @@ EXTRA_CFLAGS := -shared -fno-common -fno
 EXTRA_CFLAGS += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
 		$(call ld-option, -Wl$(comma)--hash-style=sysv)
 EXTRA_AFLAGS := -D__VDSO64__ -s
+GCOV := n
 
 obj-y += vdso64_wrapper.o
 extra-y += vdso64.lds

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