[Bug gas/12180] gas: -mfido doesn't accept floating point instructions

[fthain at telegraphics dot com.au]

http://sourceware.org/bugzilla/show_bug.cgi?id=12180

--- Comment #4 from Finn Thain <fthain at telegraphics dot com.au> 2010-11-03 
00:23:14 UTC ---
I was able to reproduce the libgfortran problem with a cross-compiler. It turns
out 
that with gcc-4.5-20101021 (binutils-2.20.51.201024),
the CPU32 build for libgfortran fails as well (I didn't try debian gcc 4.4
yet).

libtool: compile:  /Volumes/btc-0.12/build/gcc-m68k-linux-gnu-3/./gcc/xgcc 
-B/Volumes/btc-0.12/build/gcc-m68k-linux-gnu-3/./gcc/ 
-B/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/bin/ 
-B/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/lib/ -isystem 
/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/include -isystem 
/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/sys-include -DHAVE_CONFIG_H -I. 
-I../../../../gcc-4.5-20101021/libgfortran 
-iquote../../../../gcc-4.5-20101021/libgfortran/io 
-I../../../../gcc-4.5-20101021/libgfortran/../gcc 
-I../../../../gcc-4.5-20101021/libgfortran/../gcc/config -I../../.././gcc 
-D_GNU_SOURCE -std=gnu99 -Wall -Wstrict-prototypes -Wmissing-prototypes 
-Wold-style-definition -Wextra -Wwrite-strings -fcx-fortran-rules 
-ffunction-sections -fdata-sections -g -O2 -mcpu=fidoa -MT 
set_exponent_r4.lo -MD -MP -MF .deps/set_exponent_r4.Tpo -c 
../../../../gcc-4.5-20101021/libgfortran/generated/set_exponent_r4.c 
-save-temps -v  -fPIC -DPIC -o .libs/set_exponent_r4.o
../../../../gcc-4.5-20101021/libgfortran/generated/set_exponent_r4.c:
In function 'set_exponent_r4':
/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/sysroot/usr/include/bits/mathinline.h:275:749:
 
error: impossible constraint in 'asm'

For CPU32, the solution is to add -m68881 to the compiler flags. However, that
doesn't work for fido:

libtool: compile:  /Volumes/btc-0.12/build/gcc-m68k-linux-gnu-3/./gcc/xgcc 
-B/Volumes/btc-0.12/build/gcc-m68k-linux-gnu-3/./gcc/ 
-B/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/bin/ 
-B/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/lib/ -isystem 
/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/include -isystem 
/Volumes/btc-0.12/gcc-4/m68k-linux-gnu/sys-include -DHAVE_CONFIG_H -I. 
-I../../../../gcc-4.5-20101021/libgfortran 
-iquote../../../../gcc-4.5-20101021/libgfortran/io 
-I../../../../gcc-4.5-20101021/libgfortran/../gcc 
-I../../../../gcc-4.5-20101021/libgfortran/../gcc/config -I../../.././gcc 
-D_GNU_SOURCE -std=gnu99 -Wall -Wstrict-prototypes -Wmissing-prototypes 
-Wold-style-definition -Wextra -Wwrite-strings -fcx-fortran-rules 
-ffunction-sections -fdata-sections -g -O2 -mcpu=fidoa -m68881 -MT 
set_exponent_r4.lo -MD -MP -MF .deps/set_exponent_r4.Tpo -c 
../../../../gcc-4.5-20101021/libgfortran/generated/set_exponent_r4.c 
-fPIC -DPIC -o .libs/set_exponent_r4.o
/tmp/cc16Y0PJ.s: Assembler messages:
/tmp/cc16Y0PJ.s:22: Error: selected processor does not have all features 
of selected architecture
/tmp/cc16Y0PJ.s:38: Error: invalid instruction for this architecture; 
needs M68K fpu (68020 [68k, 68ec020], 68030 [68ec030], 68040 [68ec040], 
68060 [68ec060], cpu32 [68330, 68331, 68332, 68333, 68334, 68336, 68340, 
68341, 68349, 68360]) -- statement `fscale.l 12(%fp),%fp0' ignored

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