Add an ASan build

[geofft]

No description provided.

[geofft]

This is very badly implemented, I just want to see how far it gets with this much effort.

[jjhelmus]

Would a debug+asan configuration make more sense then pgo+lto+asan? Is there many cases where you want to find memory issues in an optimized build?

[jjhelmus]

Interesting. ncurses looks to have a memory leak that is triggered when running tic

2025-11-06T20:20:19.4276994Z ncurses> 1833 entries written to /build/out/usr/share/terminfo
2025-11-06T20:20:19.5434638Z ncurses> =================================================================
2025-11-06T20:20:19.5438853Z ncurses> ==6084==ERROR: LeakSanitizer: detected memory leaks
2025-11-06T20:20:19.5439440Z ncurses> 
2025-11-06T20:20:19.5439788Z ncurses> Direct leak of 1066464 byte(s) in 322 object(s) allocated from:
2025-11-06T20:20:19.5442104Z ncurses>     #0 0x5616aae2b5f4 in malloc /build/llvm/compiler-rt/lib/asan/asan_malloc_linux.cpp:67:3
2025-11-06T20:20:19.5443653Z ncurses>     #1 0x5616aaeba30d in _nc_init_termtype (/build/ncurses-6.5/progs/tic+0x19130d)
2025-11-06T20:20:19.5447281Z ncurses>     #2 0x5616aaeee34c in _nc_init_entry (/build/ncurses-6.5/progs/tic+0x1c534c)
2025-11-06T20:20:19.5452424Z ncurses>     #3 0x5616aaed2787 in _nc_parse_entry (/build/ncurses-6.5/progs/tic+0x1a9787)
2025-11-06T20:20:19.5453104Z ncurses>     #4 0x5616aaecc56c in _nc_read_entry_source (/build/ncurses-6.5/progs/tic+0x1a356c)
2025-11-06T20:20:19.5453624Z ncurses>     #5 0x5616aae6f6f2 in main (/build/ncurses-6.5/progs/tic+0x1466f2)
2025-11-06T20:20:19.5454225Z ncurses>     #6 0x7f13fab43b44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b44) (BuildId: 48c48bc6abb794461b8a558dd76b29876a0551f0)
2025-11-06T20:20:19.5454723Z ncurses> 

[geofft]

Looks like this was previously reported in https://lists.gnu.org/archive/html/bug-ncurses/2024-11/msg00013.html and not really acted upon. I'm going to turn off leak detection in the build for now (and might turn off all sanitizers if this doesn't get far enough).