Hi, there: I tried using the "-fprofile-arcs" and "-fbranch-probabilities" to build a profile based optimized binary, but got some complain about the .da files. The OS: Red Hat Enterprise Linux WS release 3 (Taroon Update 3) Kernel 2.4.21-20.ELsmp on an x86_64 The GCC: gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-34) I use "-fprofile-arcs' to compile and build the instrumented binary, command is sth. like: gcc -c -pipe -m64 -fno-omit-frame-pointer -fprofile-arcs -p -O -D... -I... -o treeprint.o treeprint.c Then run the binary, more than 900 .da file created. (A big application) Finally, use "-fbranch-probabilities" to build again, most of the files got success, only 5 failed. Command is sth. like: gcc -c -pipe -m64 -fno-omit-frame-pointer -fbranch-probabilities -p -O -D... -I... -o treeprint.o treeprint.c The fail message is: /usr/include/bits/sigset.h: At top level: /usr/include/bits/sigset.h:119: .da file contents not exhausted ...failed Cc treeprint.o ... I wonder if this is a known issue of GCC (A Bug)? Or there are some limitations of using "-fprofile-arcs"? Such as you can not combine it with "-O", "-O2" etc. Or you can not have "goto" in the source files etc.? Thanks Wei
