Description of problem: In Samba we use gdb to get the signature of a function to detect if the ABI changed. gdb in Fedora 23 fails to print the function signature. Actual results: gdb bin/default/librpc/libndr.so GNU gdb (GDB) Fedora 7.10-29.fc23 (gdb) p ndr_print_uid_t $1 = {<text variable, no debug info>} 0xa0a0 <ndr_print_uid_t> Expected results: gdb bin/default/librpc/libndr.so GNU gdb (GDB) 7.9.1 (gdb) p ndr_print_uid_t $1 = {void (struct ndr_print *, const char *, uid_t)} 0xde5d <ndr_print_uid_t>
It is a problem of GCC, not GDB. Although I do not see what's wrong there. $ rpm -qf /usr/lib/debug/usr/lib64/libndr.so.0.0.5.debug samba-debuginfo-4.3.0-3.fc23.x86_64 $ readelf -wi /usr/lib/debug/usr/lib64/libndr.so.0.0.5.debug|grep ndr_print_uid_t $ readelf -Wa /usr/lib/debug/usr/lib64/libndr.so.0.0.5.debug|grep ndr_print_uid_t 398: 000000000000a0c0 7 FUNC GLOBAL DEFAULT 12 ndr_print_uid_t
Created attachment 1096843 [details] 1.c.gz gcc -o 1.o -O2 -g 1.c -c $ readelf -wi 1.o|grep ndr_print_uid_t $ readelf -Wa 1.o|grep ndr_print_uid_t 154: 0000000000002a70 5 FUNC GLOBAL DEFAULT 1 ndr_print_uid_t __attribute__((visibility("default"))) void ndr_print_uid_t(struct ndr_print *ndr, const char *name, uid_t u) { ndr_print_dlong(ndr, name, u); } Various other functions are present in DWARF there.
Is someone looking into the issue?
This is IPA-ICF in the works, I don't think it is possible to do anything with this for GCC 5.x, and for GCC 6.x it is already quite late too. See http://gcc.gnu.org/PR63572 and http://gcc.gnu.org/PR65797 . First of all, it isn't clear what to emit in this case, what DWARF extensions we will need, and only once something is agreed on, it needs to be implemented in GCC and GDB.
You can always use -fno-ipa-icf to avoid the identical code folding optimization.
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Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.