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libc/newlib: add a config option allowing to disable builtin syscalls

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Allows to choose if one wants to keep or not the syscalls that are provided with
newlib. It passes the --disable-newlib-supplied-syscalls or
--enable-newlib-supplied-syscalls to the configure script. If one chooses to
disable the builtin syscalls, he/she will have to write his/her own. This can
be usefull to port newlib to a new platform/board.

Signed-off-by: Kévin PETIT <kpet@free.fr>
This commit is contained in:
Kévin PETIT 2011-08-28 20:12:26 +02:00
parent 4c1666134b
commit 1097bea2e0
2 changed files with 15 additions and 0 deletions
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10
config/libc/newlib.in.2
View File

@ -25,3 +25,13 @@ config LIBC_NEWLIB_IO_LDBL
depends on LIBC_NEWLIB_IO_FLOAT
help
Enable support for IOs on long doubles.
config LIBC_NEWLIB_DISABLE_SUPPLIED_SYSCALLS
bool
prompt "Disable the syscalls supplied with newlib"
help
Disable the syscalls that come with newlib. You
will have to implement your own _sbrk, _read,
_write... If you plan to port newlib to a new
platform/board, say Yes.

5
scripts/build/libc/newlib.sh
View File

@ -79,6 +79,11 @@ do_libc_start_files() {
newlib_opts+=( "--disable-newlib-io-float" )
newlib_opts+=( "--disable-newlib-io-long-double" )
fi
if [ "${CT_LIBC_NEWLIB_DISABLE_SUPPLIED_SYSCALLS}" = "y" ]; then
newlib_opts+=( "--disable-newlib-supplied-syscalls" )
else
newlib_opts+=( "--enable-newlib-supplied-syscalls" )
fi
# Note: newlib handles the build/host/target a little bit differently
# than one would expect: