chaosad / advancedexception

Requirement

In order to run successfully under MingGW64, the macro _ISOC99_SOURCE must be defined in project.yml for GCC to correctly link to vsnprintf() that returns the length of buffer needed to write when it fails due to buffer being too small:

:defines:
  # in order to add common defines:
  #  1) remove the trailing [] from the :common: section
  #  2) add entries to the :common: section (e.g. :test: has TEST defined)
  :commmon: &common_defines []
  :test:
    - *common_defines
    - TEST
    - CEXCEPTION_USE_CONFIG_FILE
    # The following macro is to ensure vsnprintf() returns the length of
    # bytes needed to write when it fails due to buffer being too small
    - _ISOC99_SOURCE

Otherwise GCC will use vsnprintf() provided by Windows, which will return a -1 if it encountered an error [1]. In this case, my implementation that uses the function will fail, because it expects the correct length required.

Reference

[1] https://sourceforge.net/p/mingw-w64/mailman/message/31241434/