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; * etc/DEBUG: Info about -g3 on OpenBSD (bug#81109).

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Eli Zaretskii 2026-07-12 09:57:01 +03:00
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etc/DEBUG
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@ -25,8 +25,15 @@ happens only with optimized code, you may need to enable optimizations.
If that happens, try using -Og first instead of -O2, as -Og disables
some optimizations that make debugging some code exceptionally hard.
Older versions of GCC may need more than just the -g3 flag. For more,
search for "analyze failed assertions" below.
The -g3 option is needed to allow GDB expand macros, which the Emacs C
code uses a lot; without it, you will need to look up the macro
definitions in the C headers and source files, and expand them by hand,
before using them in expressions you want GDB to evaluate. Older
versions of GCC may need more than just the -g3 flag. Also, Emacs
compiled with -g3 reportedly causes GDB to crash on OpenBSD, so on that
OS you should instead use either -ggdb or just -g (and the macro
information will be unavailable to GDB, unfortunately). For more about
-g3, search for "analyze failed assertions" below.
The 2 --enable-* switches are optional. They don't have any effect on
debugging with GDB, but will compile additional code that might catch