bb8f3090ba
gcc-4.2's optimizer has a strange bug where it looses code from inner
loops in certain situations. For example, if the appearently innocent
looking code below is compiled with gcc-4.2 -S -O1, the inner loop's
code is missing from the outputed assembly.
struct Size {
unsigned width;
};
struct Command {
unsigned length;
struct Size sizes[32];
};
extern void emit_command(void *command, unsigned length);
void
create_surface( struct Size size, unsigned faces, unsigned levels)
{
struct Command cmd;
unsigned face;
unsigned level;
cmd.length = faces*levels*sizeof(cmd.sizes[0]);
for(face = 0; face < faces; ++face) {
for(level = 0; level < levels; ++level) {
cmd.sizes[face*levels + level] = size;
// This should generate a shrl statement, but the whole for body
// disappears in gcc-4.2 -O1/-O2/-O3!
size.width >>= 1;
}
}
emit(&cmd, sizeof cmd.length + cmd.length);
}
Note that this is not specific to MinGW's gcc-4.2 crosscompiler (the
version typically found in debian/ubuntu's mingw32 packages). gcc-4.2 on
Linux also displays the same error. gcc-4.3 and above gets this
correctly though.
Updated MinGW debian packages with gcc-4.3 are available from
http://people.freedesktop.org/~jrfonseca/debian/pool/main/m/
|
||
|---|---|---|
| bin | ||
| configs | ||
| docs | ||
| doxygen | ||
| include | ||
| progs | ||
| scons | ||
| src | ||
| windows | ||
| .emacs-dirvars | ||
| .gitattributes | ||
| .gitignore | ||
| Makefile | ||
| SConstruct | ||
| acinclude.m4 | ||
| autogen.sh | ||
| common.py | ||
| configure.ac | ||
docs/README.directfb
Mesa DirectFB Information
Requirements
============
To build Mesa with DirectFB (DirectFBGL) support you need:
- DirectFB at least 1.0.0 (http://directfb.org)
- pkg-config at least 0.9 (http://pkgconfig.sf.net)
Installation
============
Run
make linux-directfb
to build Mesa and DirectFBGL module,
make install
to install OpenGL libraries and
cd src/mesa/drivers/directfb ; make install
to install DirectFBGL module in the proper location.
Actually, that last command may not be needed. Please provide feedback.