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Improve instructions for running with -fsanitize=address (bug#76393)

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* etc/DEBUG (ASAN_OPTIONS): Add 'detect_stack_use_after_return=0'
requirement.  Remove obsolete unexec commentary.
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Pip Cet 2025-03-01 21:39:23 +00:00
parent 3545988740
commit 1e84a87676
1 changed files with 9 additions and 8 deletions
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17
etc/DEBUG
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@ -1010,14 +1010,16 @@ program.
** Running Emacs with address sanitization
Building Emacs with address sanitization can help debug memory-use
problems, such as freeing the same object twice. To use
AddressSanitizer with GCC and similar compilers, append
problems, such as freeing the same object twice. It does, however,
require special care to ensure that Emacs's garbage collection continues
working. To use AddressSanitizer with GCC and similar compilers, append
'-fsanitize=address' to CFLAGS, either when running 'configure' or
running 'make'. Configure, build and run Emacs with
ASAN_OPTIONS='detect_leaks=0' in the environment to suppress
diagnostics of minor memory leaks in Emacs. For example:
running 'make'. When running Emacs, ensure the ASAN_OPTIONS environment
variable is set and includes 'detect_stack_use_after_return=0' (to keep
GC working) and 'detect_leaks=0' (to avoid noisy diagnostics about minor
memory leaks in Emacs). For example:
export ASAN_OPTIONS='detect_leaks=0'
export ASAN_OPTIONS='detect_leaks=0,detect_stack_use_after_return=0'
./configure CFLAGS='-O0 -g3 -fsanitize=address'
make
src/emacs
@ -1034,8 +1036,7 @@ will let you gain control when an error is detected and before
AddressSanitizer outputs to stderr or terminates the program.
Address sanitization is incompatible with undefined-behavior
sanitization, unfortunately. Address sanitization is also
incompatible with the --with-dumping=unexec option of 'configure'.
sanitization, unfortunately.
*** Address poisoning/unpoisoning