I'm trying to profile DOSEMU using -pg, but I have a problem: the mcount()
implementation here depends on GS being set to the value that libc (or the
kernel) initialized it to. (Presumably, mcount() needs access to thread local
state.)
However, DOSEMU has some signal handlers that might be called from DPMI
context, where GS is presumably going to have a different setting, and the
Linux kernel does not (cannot?) restore GS to it's former value for signal
handlers.
Soo... I sought an __attribute__ to disable the instrumentation of these signal
handlers, but the only one I could find,
__attribute__((no_instrument_function)), does not seem to cover this case -- it
neither overrides -pg, nor is it documented to do so.
Failing that, I sought a command-line flag to cancel the effect of -pg for just
this subdirectory (or the file), but I couldn't find one of those, either.
Please add an __attribute__ for this, and perhaps a negative form of -pg as
well.
--
Summary: There is neither a negative form of -pg nor an
__attribute__ to disable instrumentation of a specific
function
Product: gcc
Version: 4.3.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: naesten at gmail dot com
GCC build triplet: i486-linux-gnu
GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40498
