[ECOS] big-endian gcc compiler

[ECOS] big-endian gcc compiler

[A Roturier]

hi,

i compile gcc cross compiler for arm platform under windows and find the
compiled library is in little-endian(default) mode.

$ arm-elf-objdump.exe -x libgcc.a | more
In archive libgcc.a:

__dummy.o:     file format elf32-littlearm
rw-r--r-- 500/513   1332 Jul  4 11:18 2001 __dummy.o
architecture: arm, flags 0x00000011:

    :
    :

how do i compile the library in big-endian mode?

thanks for help.

kc



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Re: [ECOS] big-endian gcc compiler

[Thomas Faehnle]

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A Roturier wrote:
> i compile gcc cross compiler for arm platform under windows and find the
> compiled library is in little-endian(default) mode.

What you want is called "multilib mode"; search for MULTILIB_OPTIONS
in the gcc texinfo docs for a description.

Multilib mode is off by default in gcc 2.95.3, I had to adjust
the ARM-specific target makefile fragment:


*** gcc-2.95.3/gcc/config/arm/t-arm-elf.orig    Wed Aug  1 12:44:44 2001
--- gcc-2.95.3/gcc/config/arm/t-arm-elf Wed Aug  1 12:45:07 2001
***************
*** 21,35 ****
        echo '#endif' >> dp-bit.c
        cat $(srcdir)/config/fp-bit.c >> dp-bit.c

! # MULTILIB_OPTIONS  = mlittle-endian/mbig-endian
mhard-float/msoft-float mapcs-32/mapcs-26
fno-leading-underscore/fleading-underscore
! # MULTILIB_DIRNAMES = le be fpu soft 32bit 26bit elf under
! # MULTILIB_EXCEPTIONS =
! # MULTILIB_MATCHES  =
! # EXTRA_MULTILIB_PARTS = crtbegin.o crtend.o
! # LIBGCC = stmp-multilib
! # INSTALL_LIBGCC = install-multilib

  # If EXTRA_MULTILIB_PARTS is not defined above then define EXTRA_PARTS
here
! EXTRA_PARTS = crtbegin.o crtend.o

  TARGET_LIBGCC2_CFLAGS = -Dinhibit_libc
--- 21,35 ----
        echo '#endif' >> dp-bit.c
        cat $(srcdir)/config/fp-bit.c >> dp-bit.c

! MULTILIB_OPTIONS  = mlittle-endian/mbig-endian mhard-float/msoft-float
mapcs-32/mapcs-26 fno-leading-underscore/fleading-underscore
! MULTILIB_DIRNAMES = le be fpu soft 32bit 26bit elf under
! MULTILIB_EXCEPTIONS =
! MULTILIB_MATCHES  =
! EXTRA_MULTILIB_PARTS = crtbegin.o crtend.o
! LIBGCC = stmp-multilib
! INSTALL_LIBGCC = install-multilib

  # If EXTRA_MULTILIB_PARTS is not defined above then define EXTRA_PARTS
here
! # EXTRA_PARTS = crtbegin.o crtend.o

  TARGET_LIBGCC2_CFLAGS = -Dinhibit_libc


Best regards,
Thomas

-- 
Thomas Fähnle					thomas.faehnle@tst-ag.de
Digital Signal Processing			+49 731 80018-28
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