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config/libc/uClibc.in.2
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Sep 12 23:51:25 2010 +0200 (2010-09-12)
changeset 2123 ff2181adbd28
parent 2009 7e19c1de65cd
child 2484 d1a8c2ae7946
permissions -rw-r--r--
cc/gcc: disable complibs if not selected

Force gcc to not link with some companion libraries when
there are not needed (because selected-out).

There is no option to tell gcc *not* to build the Graphite and/or
LTO stuff. They *will* be built if gcc finds the suitable companion
libraries. If we do not provide them, but the host has them, then
gcc *will* find them, and link with them.

Consider the following:
- host has suitable PPL and CLooG (eg. Debian Squeeze)
- user wants to build gcc>=4.4
- user de-selects GRAPHITE
- gcc will find the hosts PPL and CLooG, and will use them
- the user moves the toolchain to an older host that does
not have them (eg. Debian Lenny)
- the toolchain fails, when it was properly setup not to

So, explicitly tell gcc *not* to use unneeded companion libs.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 # uClibc second-part option

     2 

     3 if THREADS_LINUXTHREADS

     4 

     5 choice

     6     bool

     7     prompt "Linuxthread implementation: "

     8     default LIBC_UCLIBC_LNXTHRD_OLD

     9 

    10 config LIBC_UCLIBC_LNXTHRD_OLD

    11     bool

    12     prompt "old/stable"

    13     help

    14       From the uClibc config option help:

    15         There are two versions of linuxthreads.  The older (stable) version

    16         has been in uClibc for quite a long time but hasn't seen too many

    17         updates other than bugfixes.

    18 

    19 config LIBC_UCLIBC_LNXTHRD_NEW

    20     bool

    21     prompt "new"

    22     help

    23       From the uClibc config option help:

    24         The new version has not been tested much, and lacks ports for arches

    25         which glibc does not support (like bfin/frv/etc...), but is based on

    26         the latest code from glibc, so it may be the only choice for the

    27         newer ports (like alpha/amd64/64bit arches and hppa).

    28 

    29 endchoice

    30 

    31 endif # THREADS_LINUXTHREADS

    32 

    33 config LIBC_UCLIBC_LNXTHRD

    34     string

    35     default ""      if THREADS_NONE

    36     default ""      if THREADS_NPTL

    37     default "old"   if LIBC_UCLIBC_LNXTHRD_OLD

    38     default "new"   if LIBC_UCLIBC_LNXTHRD_NEW

    39 

    40 config LIBC_UCLIBC_LOCALES

    41     bool

    42     select LIBC_UCLIBC_WCHAR

    43     prompt "Add support for locales"

    44     default n

    45     help

    46       Say y if you want uClibc to support localisation.

    47 

    48       Note that seems to be broken on recent uClibc releases.

    49 

    50 config LIBC_UCLIBC_LOCALES_PREGEN_DATA

    51     bool

    52     prompt "Use pregen locales"

    53     depends on LIBC_UCLIBC_LOCALES

    54     default y

    55     help

    56       If you see issues with using pre-generated locales data,

    57       you can try switching this off.

    58 

    59       If so, please report the issue, so we can default this

    60       to off if too many people complain.

    61 

    62 config LIBC_UCLIBC_WCHAR

    63     bool

    64     prompt "Add support for WCHAR"

    65     default n

    66     help

    67       Say y if you want uClibc to support WCHAR.

    68 

    69       Maybe this is needed, if you're building a C++-Compiler
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