1. 21 Aug, 2009 1 commit
    • Wolfgang Denk's avatar
      ARM: compiler options cleanup - improve tool chain support · f772acf8
      Wolfgang Denk authored
      
      
      For some time there have been repeated reports about build problems
      with some ARM (cross) tool chains.  Especially issues about
      (in)compatibility with the tool chain provided runtime support
      library libgcc.a caused to add and support a private implementation
      of such runtime support code in U-Boot.  A closer look at the code
      indicated that some of these issues are actually home-made.  This
      patch attempts to clean up some of the most obvious problems and make
      building of U-Boot with different tool chains easier:
      
      - Even though all ARM systems basicy used the same compiler options
        to select a specific ABI from the tool chain, the code for this was
        distributed over all cpu/*/config.mk files.  We move this one level
        up into lib_arm/config.mk instead.
      
      - So far, we only checked if "-mapcs-32" was supported by the tool
        chain; if yes, this was used, if not, "-mabi=apcs-gnu" was
        selected, no matter if the tool chain actually understood this
        option.  There was no support for EABI conformant tool chains.
        This patch implements the following logic:
      
        1) If the tool chain supports
      	"-mabi=aapcs-linux -mno-thumb-interwork"
           we use these options (EABI conformant tool chain).
        2) Otherwise, we check first if
      	"-mapcs-32"
           is supported, and then check for
      	"-mabi=apcs-gnu"
           If one test succeeds, we use the first found option.
        3) In case 2), we also test if "-mno-thumb-interwork", and use
           this if the test succeeds. [For "-mabi=aapcs-linux" we set
           "-mno-thumb-interwork" mandatorily.]
      
        This way we use a similar logic for the compile options as the
        Linux kernel does.
      
      - Some EABI conformant tool chains cause external references to
        utility functions like raise(); such functions are provided in the
        new file lib_arm/eabi_compat.c
      
        Note that lib_arm/config.mk gets parsed several times, so we must
        make sure to add eabi_compat.o only once to the linker list.
      Signed-off-by: default avatarWolfgang Denk <wd@denx.de>
      Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
      Cc: Dirk Behme <dirk.behme@googlemail.com>
      Cc: Magnus Lilja <lilja.magnus@gmail.com>
      Cc: Tom Rix <Tom.Rix@windriver.com>
      Cc: Prafulla Wadaskar <prafulla@marvell.com>
      Acked-by: default avatarSergey Kubushyn <ksi@koi8.net>
      Tested-by: default avatarMagnus Lilja <lilja.magnus@gmail.com>
      Tested-by: default avatarAndrzej Wolski <awolski@poczta.fm>
      Tested-by: default avatarGaye Abdoulaye Walsimou <walsimou@walsimou.com>
      Tested-by: default avatarTom Rix <Tom.Rix@windriver.com>
      Tested-by: default avatarJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
      f772acf8
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