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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Medium => Wishlist

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https://bugs.launchpad.net/bugs/1233014

Title:
  Use CFLAGS=-grecord-gcc-switches

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Hi!

  Tools, like systemtap, need to circumvent some bugs in GCC, notably in
  the way it reports debugging data for highly-optimized programs.
  Systemtap includes workarounds but they are only reliable when the
  kernel is using some options. Therefore, systemtap needs to know with
  which option GCC was invoked.

  For example, LTS kernels for Precise are using GCC 4.6.3 Precise which
  has a bug related to -mfentry and produce incorrect offsets for
  debugging symbols (off by 5). Systemtap includes a workaround for this
  but it can only be reliably detected if it knows that -mfentry flag
  was requested.

  This can be done by using CFLAGS=-grecord-gcc-switches. Please, use it
  for all future release, even when the version of GCC used has no known
  bug.

  Thanks.

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