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Enable glibc to include support for kernel versions different than the version from the kernel headers.

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Thanks to Nate CASE <ncase@xes-inc.com> for suggesting this use-case, and providing the patch.

 /trunk/scripts/build/libc_glibc.sh        |    4     2     2     0 +-
 /trunk/scripts/build/libc_eglibc.sh       |    2     1     1     0 +-
 /trunk/config/libc/glibc-eglibc-common.in |   44    44     0     0 +++++++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+), 3 deletions(-)
This commit is contained in:
Yann E. MORIN" 2008-08-26 21:37:46 +00:00
parent 477baecf46
commit 0a99eb0c77
3 changed files with 47 additions and 3 deletions
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44
config/libc/glibc-eglibc-common.in
View File

@ -67,3 +67,47 @@ config LIBC_ADDONS_LIST
earlier.
Eg.: crypt (for very old libces)
config LIBC_GLIBC_USE_HEADERS_MIN_KERNEL
bool
prompt "Use headers version for minimum kernel version supported"
default y
help
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_MIN_KERNEL_CHOSEN
string
prompt "Minimum kernel version supported"
default "2.6.9"
depends on ! LIBC_GLIBC_USE_HEADERS_MIN_KERNEL
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".
config LIBC_GLIBC_MIN_KERNEL
string
default KERNEL_VERSION if LIBC_GLIBC_USE_HEADERS_MIN_KERNEL
default LIBC_GLIBC_MIN_KERNEL_CHOSEN if ! LIBC_GLIBC_USE_HEADERS_MIN_KERNEL

2
scripts/build/libc_eglibc.sh
View File

@ -198,7 +198,7 @@ do_libc() {
# We don't need to be conditional on wether the user did set different
# values, as they CT_LIBC_GLIBC_EXTRA_CONFIG is passed after extra_config
extra_config="--enable-kernel=$(echo ${CT_KERNEL_VERSION} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
extra_config="--enable-kernel=$(echo ${CT_LIBC_GLIBC_MIN_KERNEL} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
case "${CT_THREADS}" in
nptl) extra_config="${extra_config} --with-__thread --with-tls";;

4
scripts/build/libc_glibc.sh
View File

@ -211,7 +211,7 @@ do_libc_start_files() {
extra_config=""
case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in
*enable-kernel*) ;;
*) extra_config="${extra_config} --enable-kernel=$(echo ${CT_KERNEL_VERSION} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
*) extra_config="${extra_config} --enable-kernel=$(echo ${CT_LIBC_GLIBC_MIN_KERNEL} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
esac
case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in
*-tls*) ;;
@ -314,7 +314,7 @@ do_libc() {
# We don't need to be conditional on wether the user did set different
# values, as they CT_LIBC_GLIBC_EXTRA_CONFIG is passed after extra_config
extra_config="--enable-kernel=$(echo ${CT_KERNEL_VERSION} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
extra_config="--enable-kernel=$(echo ${CT_LIBC_GLIBC_MIN_KERNEL} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"
case "${CT_THREADS}" in
nptl) extra_config="${extra_config} --with-__thread --with-tls";;