cvs commit: src Makefile.inc1

[Ruslan Ermilov]

ru          2004-12-22 22:00:02 UTC

  FreeBSD src repository

  Modified files:
    .                    Makefile.inc1 
  Log:
  Further fix the case mentioned in rev. 1.302.  The
  intent was (and still is) that if a user has say
  CPUTYPE=i686 set in /etc/make.conf, we don't print
  the assignment type warning unless TARGET_CPUTYPE
  is overridden.
  
  Unfortunately, the implementation was buggy, and
  only recent changes to bsd.cpu.mk that swapped
  canonical and alias values of some CPU types made
  the bug apparent.
  
  Here's what happens here.
  
  - CPUTYPE=i686 is set in /etc/make.conf,
  - bsd.cpu.mk reset it to "pentiumpro",
  - Makefile.inc1 compares this canonical value
    with the result of the following test,
  
  make -f /dev/null CPUTYPE=pentiumpro -V CPUTYPE
  
  and expects the result to be "pentiumpro" too,
  but "i686" is returned, here's why.  We have two
  CPUTYPE variables, global, set to "i686" in
  /etc/make.conf, and command-line (of a higher
  precedence), set to "pentiumpro".
  
  The following part of bsd.cpu.mk,
  
  .  elif ${CPUTYPE} == "i686"
  CPUTYPE = pentiumpro
  
  which is responsible for converting aliases to
  canonical values, sees the value of the CPUTYPE
  command-line variable first, "pentiumpro", and
  no conversion is done -- the net effect is that
  CPUTYPE global stays with its old value "i686",
  and "make -V CPUTYPE" (which prints variables
  in the global context) returns "i686".
  
  The fix was to pass the CPUTYPE in the test above
  as an environment variable instead of as a command
  line variable, i.e.,
  
  CPUTYPE=pentiumpro make -f /dev/null -V CPUTYPE
  
  This time, CPUTYPE global is still set to "i686"
  initially (by /etc/make.conf), and an envieronment
  variable CPUTYPE (of a lower precedence) is set
  to "pentiumpro".  The .elif sees it's set to
  "i686" and resets it to "pentiumpro", and so
  "make -V" returns "pentiumpro".
  
  NB: these various types of make(1) variables can
  be very painful, especially when combined with
  "make -V".
  
  Revision  Changes    Path
  1.471     +2 -2      src/Makefile.inc1