linux-yocto/3.8: Makefile: add -grecord-gcc-switches if using -mfentry

Richard,

One small update. A kernel fix from Tom for 3.8, the patch has all the details.

** This is a resend, since I forgot to cc oe-core when I initially sent
out the changes.

Cheers,

Bruce

The following changes since commit bef8d8d3bd2d96fb62734071597df415c7c23f4c:

qt4-embedded: bump PR to allow removal of meta-oe bbappend (2013-04-16 16:51:41 +0100)

are available in the git repository at:

git://git.pokylinux.org/poky-contrib zedd/kernel
http://git.pokylinux.org/cgit.cgi/poky-contrib/log/?h=zedd/kernel

Bruce Ashfield (1):
linux-yocto/3.8: Makefile: add -grecord-gcc-switches if using
-mfentry

 meta/recipes-kernel/linux/linux-yocto-rt_3.8.bb   |    4 ++--
 meta/recipes-kernel/linux/linux-yocto-tiny_3.8.bb |    2 +-
 meta/recipes-kernel/linux/linux-yocto_3.8.bb      |   12 ++++++------
 3 files changed, 9 insertions(+), 9 deletions(-)

1.7.10.4

Commit a2546fae [ftrace: Add -mfentry to Makefile on function tracer] adds support for using -mfentry when possible, whenever the ftrace CONFIG_FUNCTION_TRACER option is enabled.

This unfortunately causes bogus dwarf debuginfo to be generated:

gcc Bug 54793 - the location of a formal_parameter is not started from a
function entry with -mfentry

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54793

This can be fixed by applying the gcc patch above, which will be present in gcc-4.8, but in the meantime, the problem is currently being worked around in different ways by various tools. One of those tools that we support in Yocto, Systemtap, requires the DW_AT_producer string contain -mfentry, which means that it's assuming record-gcc-switches is also used:

SystemTap Bug 15123 - workaround for bad debuginfo for -mfentry
http://sourceware.org/bugzilla/show_bug.cgi?id=15123

The lack of -grecord-gcc-switches and therefore a missing -mfentry string in Yocto leads to the following Yocto bug:

Bug 4099 - Crosstap script check fails
https://bugzilla.yoctoproject.org/show_bug.cgi?id=4099

Which is what this patch intends to fix.

It only affects architectures that HAVE_FENTRY when CONFIG_FUNCTION_TRACER is turned on and in any case is just adding to the debuginfo, so there doesn't seem to be much risk to adding it.

---
 meta/recipes-kernel/linux/linux-yocto-rt_3.8.bb   |    4 ++--
 meta/recipes-kernel/linux/linux-yocto-tiny_3.8.bb |    2 +-
 meta/recipes-kernel/linux/linux-yocto_3.8.bb      |   12 ++++++------
 3 files changed, 9 insertions(+), 9 deletions(-)

index 04642a4..980229c 100644
@@ -8,8 +8,8 @@ LINUX_KERNEL_TYPE = "preempt-rt"
 
 KMETA = "meta"
 
-SRCREV_machine ?= "0f7d294a9d07713059af345188f9cd4f549b4e77"
-SRCREV_machine_qemuppc ?= "82cdb00523b3f86219706d9f12dc80ff8d1c747a"
+SRCREV_machine ?= "fd5af245e21d80e8700d41c1ecf3fc4b2c3d2e40"
+SRCREV_machine_qemuppc ?= "fa8b702a32cc19e77805d91224d0409f09808c88"
 SRCREV_meta ?= "27b63fdbd25ad1a37bacc05f49a205c150d21779"
 
 PR = "${INC_PR}.1"

index 1fe4139..6ef143e 100644
@@ -12,7 +12,7 @@ LINUX_VERSION ?= "3.8.4"
 
 KMETA = "meta"
 
-SRCREV_machine ?= "11998bd1f44b21cd0b8c0ca11cbd36865f14bfdc"
+SRCREV_machine ?= "d9a45e3325030f7bd6f37947a7a0b12da7f602c3"
 SRCREV_meta ?= "27b63fdbd25ad1a37bacc05f49a205c150d21779"
 
 PR = "${INC_PR}.1"

index 91cc52d..4bf6bf4 100644
@@ -3,12 +3,12 @@ require recipes-kernel/linux/linux-yocto.inc
 KBRANCH_DEFAULT = "standard/base"
 KBRANCH = "${KBRANCH_DEFAULT}"
 
-SRCREV_machine_qemuarm ?= "ec3299eaa89a7302009e3d46c9570f633ff32e9a"
-SRCREV_machine_qemumips  ?= "0d60789d710808e38690f27216c3ab13753e1055"
-SRCREV_machine_qemuppc ?= "223428bbc1a355200bd9a8046fd272c1b9b13e67"
-SRCREV_machine_qemux86 ?= "11998bd1f44b21cd0b8c0ca11cbd36865f14bfdc"
-SRCREV_machine_qemux86-64 ?= "11998bd1f44b21cd0b8c0ca11cbd36865f14bfdc"
-SRCREV_machine ?= "11998bd1f44b21cd0b8c0ca11cbd36865f14bfdc"
+SRCREV_machine_qemuarm ?= "1473dd2b4505109d45bd7099f63826a66b71103d"
+SRCREV_machine_qemumips  ?= "1695c38d04855cc225bcc1968289770f0fa0ea64"
+SRCREV_machine_qemuppc ?= "8b39c0424704a40c740b1ac61449fdf190a8460a"
+SRCREV_machine_qemux86 ?= "d9a45e3325030f7bd6f37947a7a0b12da7f602c3"
+SRCREV_machine_qemux86-64 ?= "d9a45e3325030f7bd6f37947a7a0b12da7f602c3"
+SRCREV_machine ?= "d9a45e3325030f7bd6f37947a7a0b12da7f602c3"
 SRCREV_meta ?= "27b63fdbd25ad1a37bacc05f49a205c150d21779"
 
 SRC_URI = "git://git.yoctoproject.org/linux-yocto-3.8.git;protocol=git;bareclone=1;branch=${KBRANCH},${KMETA};name=machine,meta"

1.7.10.4