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From: Mike Smith <msmith@FreeBSD.org>
Date: Wed, 9 Jan 2002 19:52:01 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/conf kern.post.mk kern.pre.mk kmod.mk
         kmod_syms.awk
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msmith      2002/01/09 19:52:01 PST

  Modified files:
    sys/conf             kern.post.mk kern.pre.mk kmod.mk 
  Added files:
    sys/conf             kmod_syms.awk 
  Log:
  Eliminate the use of commons in the kernel and modules,
  simplifying the module linking process and eliminating the risks
  associated with doubly-defined variables.
  
  Cases where commons were legitimately used (detection of
  compiled-in subsystems) have been converted to use sysinits, and
  any new code should use this or an equivalent practice as a
  matter of course.
  
  Modules can override this behaviour by substituting -fno-common
  out of ${CFLAGS} in cases where commons are necessary
  (eg. third-party object modules).  Commons will be resolved and
  allocated space when the kld is linked as part of the module
  build process, so they will not pose a risk to the kernel or
  other modules.
  
  Provide a mechanism for controlling the export of symbols from
  the module namespace.  The EXPORT_SYMS variable may be set in the
  Makefile to NO (export no symbols), a list of symbols to export,
  or the name of a file containing a newline-seperated list of
  symbols to be exported.  Non-exported symbols are converted to
  local symbols.  If EXPORT_SYMS is not set, all global symbols are
  currently exported.  This behaviour is expected to change (to
  exporting no symbols) once modules have been converted.
  
  Reviewed by:    peter (in principle)
  Obtained from:  green (kmod_syms.awk)
  
  Revision  Changes    Path
  1.7       +1 -1      src/sys/conf/kern.post.mk
  1.5       +2 -2      src/sys/conf/kern.pre.mk
  1.110     +28 -1     src/sys/conf/kmod.mk
  1.1       +27 -0     src/sys/conf/kmod_syms.awk (new)

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