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; * etc/DEBUG: Add link to GCC bug #78685.

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Sean Whitton 2025-04-30 17:12:50 +08:00
parent 80cbd1e31c
commit d56e5ba97e
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etc/DEBUG
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@ -20,7 +20,7 @@ such as --prefix):
CFLAGS='-O0 -g3' CFLAGS='-O0 -g3'
The -O0 flag is important, as debugging optimized code can be hard, even The -O0 flag is important, as debugging optimized code can be hard, even
in the case that the -Og compiler option is used. If the problem in the case that the -Og compiler option is used.[1] If the problem
happens only with optimized code, you may need to enable optimizations. happens only with optimized code, you may need to enable optimizations.
If that happens, try using -Og first instead of -O2, as -Og disables If that happens, try using -Og first instead of -O2, as -Og disables
some optimizations that make debugging some code exceptionally hard. some optimizations that make debugging some code exceptionally hard.
@ -38,6 +38,9 @@ this below under "Debugging Emacs redisplay problems".
Emacs needs not be installed to be debugged, you can debug the binary Emacs needs not be installed to be debugged, you can debug the binary
created in the 'src' directory. created in the 'src' directory.
[1] gcc's -Og has some known problems and limitations, documented here:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78685
*** Configuring GDB *** Configuring GDB
To start GDB to debug Emacs, you can simply type "gdb ./emacs RET" at To start GDB to debug Emacs, you can simply type "gdb ./emacs RET" at