[Qemu-devel] yet another proposed solution for gcc 4.x

[Carlo Marcelo Arenas Belon]

Greetings,

attached patch, adds a ./configure option for setting the C compiler that will
be used to build op.c for each of the targets; letting the user compile
everything else with gcc 4.x if configured as the default C compiler while
isolating the opcode generation which currently relies in gcc 3.x for dyngen
to be able to make sense of it.

tested it in a gentoo 2006.0 system (amd64) using gcc-4.1.1 to compile
qemu-0.8.1 and the CVS HEAD, by instructing qemu to use gcc-3.4.5 for op.c,
configuring it with :

  ./configure --op-cc=gcc-3.4.5 --disable-gcc-check

didn't modify the gcc-check function in ./configure to test $op_cc instead to
minimize the changes proposed, and because I wasn't sure that doing so was
beneficial to the end user without a description of the options that can be
used to select a different compiler for different parts of the code.

FYI gcc-4.1.1 is not able to compile qemu-0.8.1 or the CVS HEAD because it
confuses dyngen and makes it generate invalid code as can be seen in gentoo's
bug 132667.

  https://bugs.gentoo.org/show_bug.cgi?id=132667

and which includes a hacky fix (by using a helper function), but i consider
wasn't worth fixing as the resulting binary won't work at all (as expected).

Carlo

qemu-opcc.patch
Description: Text document