1.1 --- a/config/libc/glibc-eglibc-common.in	Tue Aug 26 21:30:22 2008 +0000
     1.2 +++ b/config/libc/glibc-eglibc-common.in	Tue Aug 26 21:37:46 2008 +0000
     1.3 @@ -67,3 +67,47 @@
     1.4        earlier.
     1.5  
     1.6        Eg.: crypt        (for very old libces)
     1.7 +
     1.8 +config LIBC_GLIBC_USE_HEADERS_MIN_KERNEL
     1.9 +    bool
    1.10 +    prompt "Use headers version for minimum kernel version supported"
    1.11 +    default y
    1.12 +    help
    1.13 +      If enabled, crosstool-ng will use the chosen version of kernel
    1.14 +      headers for the glibc minimum kernel version supported, which is
    1.15 +      what gets passed to "--enable-kernel=" when configuring glibc.
    1.16 +
    1.17 +      Enabling this will ensure that no legacy compatibility code for
    1.18 +      older kernels is built into your C libraries, but it will
    1.19 +      be unable to run on kernel versions older than whichever kernel
    1.20 +      headers version you've built the toolchain for.
    1.21 +
    1.22 +      If you know for sure that your toolchain will never need to build
    1.23 +      applications that will run under a kernel version older than your
    1.24 +      chosen kernel headers version (CT_KERNEL_VERSION), you can choose
    1.25 +      "y" here.
    1.26 +
    1.27 +config LIBC_GLIBC_MIN_KERNEL_CHOSEN
    1.28 +    string
    1.29 +    prompt "Minimum kernel version supported"
    1.30 +    default "2.6.9"
    1.31 +    depends on ! LIBC_GLIBC_USE_HEADERS_MIN_KERNEL
    1.32 +    help
    1.33 +      Specify the earliest Linux kernel version you want glibc to
    1.34 +      include support for.  This does not have to match the kernel
    1.35 +      headers version used for your toolchain.  This controls what is
    1.36 +      passed to the "--enable-kernel=" option to the glibc configure
    1.37 +      script.
    1.38 +
    1.39 +      If you want to be able to statically link programs with your
    1.40 +      toolchain's C library, make sure this kernel version is lower than
    1.41 +      all kernels you wish to support to avoid "FATAL: kernel too old"
    1.42 +      errors.  The higher the version you specify, the less legacy code
    1.43 +      will be built into libc.
    1.44 +
    1.45 +      Most people can leave this at the default value of "2.6.9".
    1.46 +
    1.47 +config LIBC_GLIBC_MIN_KERNEL
    1.48 +    string
    1.49 +    default KERNEL_VERSION if LIBC_GLIBC_USE_HEADERS_MIN_KERNEL
    1.50 +    default LIBC_GLIBC_MIN_KERNEL_CHOSEN if ! LIBC_GLIBC_USE_HEADERS_MIN_KERNEL

     2.1 --- a/scripts/build/libc_eglibc.sh	Tue Aug 26 21:30:22 2008 +0000
     2.2 +++ b/scripts/build/libc_eglibc.sh	Tue Aug 26 21:37:46 2008 +0000
     2.3 @@ -198,7 +198,7 @@
     2.4      # We don't need to be conditional on wether the user did set different
     2.5      # values, as they CT_LIBC_GLIBC_EXTRA_CONFIG is passed after extra_config
     2.6  
     2.7 -    extra_config="--enable-kernel=$(echo ${CT_KERNEL_VERSION} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
     2.8 +    extra_config="--enable-kernel=$(echo ${CT_LIBC_GLIBC_MIN_KERNEL} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
     2.9  
    2.10      case "${CT_THREADS}" in
    2.11          nptl)           extra_config="${extra_config} --with-__thread --with-tls";;

     3.1 --- a/scripts/build/libc_glibc.sh	Tue Aug 26 21:30:22 2008 +0000
     3.2 +++ b/scripts/build/libc_glibc.sh	Tue Aug 26 21:37:46 2008 +0000
     3.3 @@ -211,7 +211,7 @@
     3.4      extra_config=""
     3.5      case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in
     3.6          *enable-kernel*) ;;
     3.7 -        *) extra_config="${extra_config} --enable-kernel=$(echo ${CT_KERNEL_VERSION} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
     3.8 +        *) extra_config="${extra_config} --enable-kernel=$(echo ${CT_LIBC_GLIBC_MIN_KERNEL} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
     3.9      esac
    3.10      case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in
    3.11          *-tls*) ;;
    3.12 @@ -314,7 +314,7 @@
    3.13      # We don't need to be conditional on wether the user did set different
    3.14      # values, as they CT_LIBC_GLIBC_EXTRA_CONFIG is passed after extra_config
    3.15  
    3.16 -    extra_config="--enable-kernel=$(echo ${CT_KERNEL_VERSION} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
    3.17 +    extra_config="--enable-kernel=$(echo ${CT_LIBC_GLIBC_MIN_KERNEL} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
    3.18  
    3.19      case "${CT_THREADS}" in
    3.20          nptl)           extra_config="${extra_config} --with-__thread --with-tls";;