[Bug c/126702] undefined reference to inline function

[arsen at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126702

--- Comment #9 from Arsen Arsenović <arsen at gcc dot gnu.org> ---
gcc 4.7.4 defaulted to traditional GNU inline semantics

maybe -fgnu89-inline works for you

it may even make sense to do -std=gnu89 since it's old code.

see https://gcc.gnu.org/onlinedocs/gcc/Inline.html for traditional GNU inline
semantics (the last handful of paragraphs)