crosstool-ng/config/libc/glibc-eglibc-common.in

# This file contains the common configuration options
# that apply to both glibc and eglibc.
#
# Please note:
# the symlink is a hack around the fact that mconf can not parse
# the same file more than once, and errors out if it is the case.
# If mconf is updated to accept multiple inclusion of the same
# file, then the symlink can go (and the includers be updated).

comment "glibc/eglibc common options"

config LIBC_GLIBC_EXTRA_CONFIG
    string
    prompt "extra config"
    default ""
    help
      Extra flags to pass onto ./configure when configuring.

      Eg.: --enable-static-nss

config LIBC_GLIBC_EXTRA_CFLAGS
    string
    prompt "extra target CFLAGS"
    default ""
    help
      Extra target CFLAGS to use when building.

config LIBC_EXTRA_CC_ARGS
    string
    prompt "gcc extra flags"
    default ""
    help
      Extra flags to pass gcc when building.

      Seldom used, except for sparc64 which seems to need the flag -64
      to be passed onto gcc.

config LIBC_GLIBC_USE_PORTS
    bool
    prompt "Use the ports addon"
    default n
    help
      The ports addon contains some architecture ports that are not available
      in the official distribution.

      For example, this is the case for ARM with for 2.4 and above.

      Say n only if you're sure that your architecture is in the official
      distribution for your chosen version.

config LIBC_ADDONS
    bool
    prompt "Pass extra addons list"
    default n
    help
      If you say Y here, you'll be able to give the list of addons you want to
      include in your C library.

config LIBC_ADDONS_LIST
    string
    prompt "Extra addons"
    default ""
    depends on LIBC_ADDONS
    help
      Extra addons to include. Space separated list.

      You need to specify neither linuxthreads nor nptl, as they are added
      automagically for you depending on the threading model you choosed
      earlier.

      Eg.: crypt        (for very old libces)

if KERNEL_linux

choice
    bool
    prompt "Minimum supported kernel version"
    default LIBC_GLIBC_KERNEL_VERSION_AS_HEADERS

config LIBC_GLIBC_KERNEL_VERSION_NONE
    bool
    prompt "Let ./configure decide"
    help
      Let ./configure decide what minimum kernel version glibc/eglibc
      will be able to run against.
      
      This will inclde legacy compatibility code for older kernels in
      the C library, thus ensuring that it will run on a large number
      of old kernels.
      
      The minimum kernel version supported will be dependent upon the
      target you build for. For example:
        alpha*-*-linux-gnu      Requires Linux 2.6.9 for NPTL
        sh[34]-*-linux-gnu      Requires Linux 2.6.11
        powerpc*                Requires Linux 2.4.19
        arm*-*-linux-*gnueabi   Requires Linux 2.6.16

config LIBC_GLIBC_KERNEL_VERSION_AS_HEADERS
    bool
    prompt "Same as kernel headers (default)"
    help
      Normaly, you'll want glibc/eglibc to run against the same kernel
      version as the one used for the headers.
      
      This is the default.
      
      If enabled, crosstool-ng will use the chosen version of kernel
      headers for the glibc minimum kernel version supported, which is
      what gets passed to "--enable-kernel=" when configuring glibc.
      
      Enabling this will ensure that no legacy compatibility code for
      older kernels is built into your C libraries, but it will
      be unable to run on kernel versions older than whichever kernel
      headers version you've built the toolchain for.
      
      If you know for sure that your toolchain will never need to build
      applications that will run under a kernel version older than your
      chosen kernel headers version (CT_KERNEL_VERSION), you can choose
      "y" here.

config LIBC_GLIBC_KERNEL_VERSION_CHOSEN
    bool
    prompt "Specific kernel version"
    help
      Specify the earliest Linux kernel version you want glibc to
      include support for.  This does not have to match the kernel
      headers version used for your toolchain.  This controls what is
      passed to the "--enable-kernel=" option to the glibc configure
      script.

      If you want to be able to statically link programs with your
      toolchain's C library, make sure this kernel version is lower than
      all kernels you wish to support to avoid "FATAL: kernel too old"
      errors.  The higher the version you specify, the less legacy code
      will be built into libc.

      Most people can leave this at the default value of "2.6.9".

if LIBC_GLIBC_KERNEL_VERSION_CHOSEN

config LIBC_GLIBC_MIN_KERNEL_VERSION
    string
    prompt "Minimum kernel version to support"
    default "2.6.9"
    help
      Enter here the lowest kernel version glibc/eglibc will be able to
      run against.
      
      The minimum kernel version supported will be dependent upon the
      target you build for. For example:
        alpha*-*-linux-gnu      Requires Linux 2.6.9 for NPTL
        sh[34]-*-linux-gnu      Requires Linux 2.6.11
        powerpc*                Requires Linux 2.4.19
        arm*-*-linux-*gnueabi   Requires Linux 2.6.16
      
      Note that no sanity check is performed by crosstool-NG to ensure
      that the value you enter here is appropriate for your target.

endif # LIBC_GLIBC_KERNEL_VERSION_CHOSEN

endchoice

config LIBC_GLIBC_MIN_KERNEL
    string
    default ""                            if LIBC_GLIBC_KERNEL_VERSION_NONE
    default KERNEL_VERSION                if LIBC_GLIBC_KERNEL_VERSION_AS_HEADERS
    default LIBC_GLIBC_MIN_KERNEL_VERSION if LIBC_GLIBC_USE_HEADERS_MIN_KERNEL

endif # KERNEL_linux