Generate stubs that tell you when they are called. Helpful when componentizing for test.

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>\n"
puts "#define EXPLODE(name) void name() { assert(!\"unexpected call\"); }"
puts ARGF.grep(LINK_SYMBOL) { |string| "EXPLODE(#{$1})" }      \
         .uniq                                                 \
         .sort                                                 \
         .join($/)