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Bug: setjmp multilib appears broken


The functions setjmp and longmp in the thumb libc.a are in fact
compiled as ARM code.

The linker complains when I attempt to link my program.

/usr/local/lib/gcc/arm-elf/4.1.0/../../../../arm-elf/bin/ld:
/usr/local/lib/gcc/arm-elf/4.1.0/../../../../arm-elf/lib/thumb/libg.a(lib_a-setjmp.o)(longjmp):
warning: interworking not enabled.
 first occurrence: proc.o: thumb call to arm
proc.o: In function `kexit':../../kernel/proc.c:55: warning: internal
error: dangerous error

$ arm-elf-objdump -rS ./arm-elf/thumb/newlib/libc/machine/arm/lib_a-setjmp.o

./arm-elf/thumb/newlib/libc/machine/arm/lib_a-setjmp.o:     file
format elf32-littlearm

Disassembly of section .text:

00000000 <setjmp>:
  0:   e8a07ff0        stmia   r0!, {r4, r5, r6, r7, r8, r9, sl, fp,
ip, sp, lr}
  4:   e3a00000        mov     r0, #0  ; 0x0
  8:   e31e0001        tst     lr, #1  ; 0x1
  c:   01a0f00e        moveq   pc, lr
 10:   e12fff1e        bx      lr

00000014 <longjmp>:
 14:   e8b07ff0        ldmia   r0!, {r4, r5, r6, r7, r8, r9, sl, fp,
ip, sp, lr}
 18:   e1b00001        movs    r0, r1
 1c:   03a00001        moveq   r0, #1  ; 0x1
 20:   e31e0001        tst     lr, #1  ; 0x1
 24:   01a0f00e        moveq   pc, lr
 28:   e12fff1e        bx      lr

Here are the relevant lines from the compilation:

make[9]: Entering directory
`/home/sjackman/src/toolchain/src/_build/arm-elf/thumb/newlib/libc/machine/arm'
arm-elf-gcc -B/home/sjackman/src/toolchain/src/_build/arm-elf/newlib/
-isystem /home/sjackman/src/toolchain/src/_build/arm-elf/newlib/targ-include
-isystem /home/sjackman/src/toolchain/src/newlib/libc/include -O2
-D__NO_SYSCALLS__ -DNO_FLOATING_POINT -DHAVE_FCNTL -DHAVE_GETTIMEOFDAY
-DHAVE_NANOSLEEP -fno-builtin    -c -o lib_a-setjmp.o `test -f
'setjmp.S' || echo
'../../../../../../../newlib/libc/machine/arm/'`setjmp.S
rm -f lib.a
arm-elf-ar cru lib.a lib_a-setjmp.o lib_a-access.o
arm-elf-ranlib lib.a
make[9]: Leaving directory
`/home/sjackman/src/toolchain/src/_build/arm-elf/thumb/newlib/libc/machine/arm'

It looks as though the option -mthumb has been omitted.

Cheers,
Shaun


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