On 5/9/25 16:45, Nikolaos Chatzikonstantinou wrote:
[...] I'm worried about: 1. What mode GNU m4 opens files in; m4p always open in binary, potentially treating carriage return differently on Windows.
A quick glance through the C code (<URL:http://git.savannah.gnu.org/cgit/m4.git/tree/src?h=branch-1.4>) confirms that at least the input files mentioned on the command line are opened in text mode. (The process_file function in m4.c calls m4_path_search with the "binary" argument false.)
Searching the code for "m4_path_search" and examining how each call to that function is reached should answer your questions on this topic.
-- Jacob