gccmock.rb

# gccmock - generate exploding link stubs from linker error messages
#
# Usage: gcc [files] 2>&1 | ruby gccmock.rb > [filename].c

LINK_SYMBOL = /"_([_a-z0-9]*)",/

puts "#include <assert.h>"
puts "#define EXPLODE(name) void name() { assert(!\"unexpected call\"); }"
puts *ARGF.read.scan(LINK_SYMBOL).map { |a| "EXPLODE(#{a[0]})" }.sort.uniq

This is actually longer than my previous version, but the $1 in grep doesn't feel very pure.