------- Comment #3 from dominiq at lps dot ens dot fr 2009-06-11 15:23 ------- > I'm not so much of an export in the terminology. What exactly does > regression mean?
It means that a code worked at revision n (here 4.4.0) and no longer at revision n+1 (here 4.5.0). This means that either something has been broken by some change or a bug has been exposed by it. Since changes are supposed to improve any piece of code, regressions have in general a higher priority than other bugs, so it is important to mark them in the subject line (look at http://gcc.gnu.org/ml/gcc-bugs/2009-06/ for examples). Since I don't have the rights to change the subject line, you have to do it yourself or wait for some maintainer to do it. > The option -m64 does work. What exactly does it do? It forces the compilation in "64 bit mode" while the default in Darwin is 32 bit. I don't know the detail of the differences besides the fact that the addresses are coded on 64 bits instead of 32 and in general the code runs faster (~10 to 20%) with -m64. Note that I provided the information in the hope to help those who will fix the bug, meanwhile you can use -m64 as a workaround. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40413