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

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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.

(From OE-Core rev: c04f611aa4bf77867fe78a005d09434226feb62c)

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Bruce Ashfield
2013-04-16 13:13:48 -07:00
committed by Richard Purdie
parent bef8d8d3bd
commit db45a97074
3 changed files with 9 additions and 9 deletions
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meta/recipes-kernel/linux/linux-yocto-rt_3.8.bb
+2 -2
View File
@@ -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"