[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [MiNT] gcc / m68k + 68030 + fpu
On 29 June 2013 23:53, Douglas Little <email@example.com> wrote:
Here's another curious case I encountered with BM today. I tried to
remove all the FPU code from the project and this was done quite
easily. However when I disable the FPU in Hatari and run the game, it
terminates with this error:
"This program requires a 68881 or higher
arithmetic coprocessor and cannot be run
on this machine."
This is a bit strange, because the project was built without the
-m68881 flag (I used -m68030 -msoft-float) and I removed the libm
reference after taking out the code which relied on it.
68030 without FPU is not supported by my GCC 4.x distribution.
The only supported multilibs are:
-m68000 (the default): 68000 without FPU
-m68020-60: 68020/68030/68040/68060 *with* FPU
-mcpu=5475: ColdFire V4e with FPU
This means that all the shipped libraries (including the MiNTLib) support
only the above variants (libgcc and libgem also support -mshort variants).
When you use -m68030 -msoft-float, your own code will not use the FPU, but
it will be linked with the -m68020-60 MiNTLib. This is why your executable
fails to run if you don't have an FPU.