[Bug c/36845] New: The compiler fails to build the support libraries and generates incorrect code for a target

[Bug c/36845] New: The compiler fails to build the support libraries and generates incorrect code for a target

[zoltan at bendor dot com dot au]

With multilib enabled when building libgcc for avr35, the compiler generates
instructions that are illegal on that target (movw) and fails, failing the
whole installation process.

To reproduce the bug:

$ ../gcc-4.3.1/configure --target=avr-elf --disable-libada --disable-libssp
--enable-languages=c
$ make

... lots of output, then, when compiling _mulsi3:

../../../../gcc-4.3.1/libgcc/../gcc/config/avr/libgcc.S: Assembler messages:
../../../../gcc-4.3.1/libgcc/../gcc/config/avr/libgcc.S:281: Error: illegal
opcode movw for mcu avr3
../../../../gcc-4.3.1/libgcc/../gcc/config/avr/libgcc.S:283: Error: illegal
opcode movw for mcu avr3
make[4]: *** [_mulsi3.o] Error 1

and the build process stops.

Quick tests show that the generated crosscompiler avoids movw when compiling to
avr3 but generates it when compiling for avr35. The following function can be
used to demonstrate it:

int foo( int a, int *p ) { return a + *p; }

and then:

$ xgcc -O3 -mmcu=avr35 -c foo.c
/tmp/cc0IiYn4.s: Assembler messages:
/tmp/cc0IiYn4.s:15: Error: illegal opcode movw for mcu avr3
/tmp/cc0IiYn4.s:20: Error: illegal opcode movw for mcu avr3


-- 
           Summary: The compiler fails to build the support libraries and
                    generates incorrect code for a target
           Product: gcc
           Version: 4.3.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zoltan at bendor dot com dot au
 GCC build triplet: x86-linux-elf
  GCC host triplet: x86-linux-elf
GCC target triplet: avr-unknown-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36845

[Bug c/36845] The compiler fails to build the support libraries and generates incorrect code for a target

[wvangulik at xs4all dot nl]

------- Comment #1 from wvangulik at xs4all dot nl  2008-07-18 22:31 -------
This is because binutils 2.18 does not support architecture 35. Please update
to 2.18.5 (dev snapshot) ftp://sourceware.org/pub/binutils/snapshots. Search
the avr-gcc list for more info.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36845

[Bug c/36845] The compiler fails to build the support libraries and generates incorrect code for a target

[eric dot weddington at atmel dot com]

------- Comment #2 from eric dot weddington at atmel dot com  2008-07-19 13:05 -------


*** This bug has been marked as a duplicate of 35073 ***


-- 

eric dot weddington at atmel dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36845