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config/kernel.in
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 1976 2d90ec981ba3
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 # Kernel options

     2 

     3 menu "Operating System"

     4 

     5 # Config option used throughout the config and code to determine wether

     6 # we have a kernel or not (there might be different bare metal stuff)...

     7 config BARE_METAL

     8     bool

     9     default n

    10 

    11 config MINGW32

    12     bool

    13     default n

    14 

    15 # Each target OS (aka kernel) that support shared libraries can select

    16 # this, so the user can decide whether or not to build a shared library

    17 # enabled toolchain

    18 config KERNEL_SUPPORTS_SHARED_LIBS

    19     bool

    20     default n

    21 

    22 config KERNEL

    23     string

    24 

    25 config KERNEL_VERSION

    26     string

    27 

    28 source "config.gen/kernel.in"

    29 

    30 comment "Common kernel options"

    31 

    32 config SHARED_LIBS

    33     bool

    34     prompt "Build shared libraries"

    35     depends on KERNEL_SUPPORTS_SHARED_LIBS

    36     default y

    37     help

    38       Say 'y' here, unless you don't want shared libraries.

    39       

    40       You might not want shared libraries if you're building for a target that

    41       don't support it (maybe some nommu targets, for example, or bare metal).

    42 

    43 source "config.gen/kernel.in.2"

    44 

    45 endmenu
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