2eab148603
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)
28 lines
600 B
Awk
28 lines
600 B
Awk
# $FreeBSD$
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# Read global symbols from object file.
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BEGIN {
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while ("nm -g " ARGV[1] | getline) {
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if (match($0, /^[^[:space:]]+ [^AU] (.*)$/)) {
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syms[$3] = $2
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}
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}
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}
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# De-list symbols from the export list.
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// {
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if (ARGIND == 1)
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nextfile
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delete syms[$0]
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}
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# Strip commons, make everything else local.
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END {
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for (member in syms) {
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if (syms[member] == "C")
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print "-N" member
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else
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print "-L" member
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}
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}
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