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4dc10ec711
New m4 release was made after a long time, for us most importantly it ships newer gnulib so it compiles against GCC15 without forcing GNU17. * Noteworthy changes in release 1.4.20 (2025-05-10) [stable] ** Fix a bug in the `eval' builtin where it does not suppress warnings about division by zero that occurs within a more complex expression on the right hand side of || or && (present since short-circuiting was introduced in 1.4.8b). ** The `syscmd' and `esyscmd' builtins no longer mishandle a command line starting with `-' or `+' (present since "the beginning"). ** Fix regression introduced in 1.4.19 where trace output (such as with `debugmode(t)') could read invalid memory when tracing a series of pushed macros that are popped during argument collection. ** Fix regression introduced in 1.4.19 where the `format' builtin inadvertently took on locale-dependent parsing and output of floating point numbers as a side-effect of introducing message translations. While it would be nice for m4 to be fully locale-aware, such a behavior change belongs in a major version release such as 1.6, and not a minor release. ** Fix regression introduced in 1.4.11 where the experimental `changeword' builtin could cause a crash if given a regex that does not match all one-byte prefixes of valid longer matches. As a reminder, `changeword' is not recommended for production use, and will likely not be present in the next major version release. ** On non-Unix platforms where binary files differ from text, loading a frozen file (which should be cross-platform compatible) now correctly uses binary mode. ** Several documentation improvements to the manual. ** Update to comply with newer C standards, and inherit portability improvements from gnulib. Link: https://github.com/openwrt/openwrt/pull/18821 Signed-off-by: Robert Marko <robimarko@gmail.com>