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b20687d0e7
When a wrapped symbol is provided in its own file, it's possible for the linker to skip that file entirely and not return to it depending on the order of libraries passed on the linker command line. This is because these wrapped symbols create linker cycles (libmain_espXX depends on liblwip but liblwip now also depends on libmain for the wrapped functions in lwip_patch.c, for example.) Linker failure for symbols in lwip_patch.c was reproducible if mDNS was disabled in the board configuration. This commit adds an explicit undefined symbol for each file, to ensure the linker will add the wrapped objects on its first pass. This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>