[Bug 173914] [build] share/mk/bsd.compiler.mk does not know ccache

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=173914

--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Sun Mar  8 22:39:20 UTC 2015
New revision: 279794
URL: https://svnweb.freebsd.org/changeset/base/279794

Log:
  MFC r247527 (by brooks):
    Provide slightly more helpful feedback when we can't figure out what
    compiler the user is using.

    PR:        misc/173914

  MFC r265829 (by imp):
    Support, to the extent we generate proper command lines, compiling
    with clang 3.3. Useful for test building -current on a -stable system
    in individual directories. Potentially useful if we ever want to
    support, say, gcc 4.8 or 4.9's new warnings when building with an
    external toolchain (but such support not yet committed). Document
    the bsd.compiler.mk interface.

  MFC r266587 (by imp):
    Allow CC to not actually exist. During the ports INDEX run, all the
    Makefiles are evaluated without building things. In a normal build,
    the prerequisites would be built, and CC would be an actual thing. In
    an INDEX build, though, they don't exists. Redirect stderr to get rid
    of annoying messages, and assume that the compiler version is 0 if the
    actual compiler can't tell us. Do this in preference to guessing based
    on numbers because gcc410 might be 4.10, or 4.1.0 and without
    carefully crafted special knowledge we differentiate between them
    easily (also ming-gcc has no clues at all). Elsewhere, don't trust
    the compiler version if it is 0.

  MFC r273405 (by bapt):
    When using an external toolchain note that gcc 4.8+ supports C++11

    Submitted by:    imp

  MFC r275557 (by ngie):
    Fix typos in comments and wrap to <80 columns

  MFC r275588 (by ngie):
    ${CC} --version doesn't need to be queried if both COMPILER_TYPE and
    COMPILER_VERSION are known

  MFC r275589 (by ngie):
    The previous commit should have been a logical or not a logical "and"

    Pointyhat to: me

Changes:
_U  stable/9/
_U  stable/9/share/
_U  stable/9/share/mk/
  stable/9/share/mk/bsd.compiler.mk
  stable/9/share/mk/bsd.sys.mk

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