krkos
commented
3 years ago - Move the definition of char trap_err_msg[] from header file to source file and declare the variable as extern in the header.
- GCC since v10.0 changes default handling of tentatively defined global variables to be in accordance with the C standard, what inhibits their merging by linker on multiple definition. While it is possible to work around this behaviour by forcing -fcommon, the better approach is to fix the definitions as is done here.
- For additional details see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85678