[Buildroot] [PATCH 1/2 v2] toolchain: linker options with a $ sign are not supported

Thomas De Schampheleire patrickdepinguin at gmail.com
Thu Jul 31 06:38:37 UTC 2014


On Thu, Jul 31, 2014 at 12:57 AM, Yann E. MORIN <yann.morin.1998 at free.fr> wrote:
> As reported in bug #7172 [0], setting BR2_TARGET_LDFLAGS to a value
> containing a $ sign can lead to unexpected results.
>
> This is because it is very hard to know when the $ sign gets evaluated:
>   - in the Buildroot-level make
>   - in the shell called by the Buildroot-level make
>   - in the package's own build-system, either at configure time, in the
>     Makefile, in a shell in the Makefile...
>
> So, it is very difficult to know how much escaping that would need.
>
> A proposal is to use a shell variable to pass such values unmolested.
> But it is not that simple either, since it still contains a $ sign, and
> there is not much certainty as to when it would be evaluated.
>
> Instead, just document this limitation, both in the help text for
> BR2_TARGET_LDFLAGS, and in the known-issues section in the manual.
>
> Does not really fix #7172, but at least the limitation is documented.
>
> [0] https://bugs.buildroot.org/show_bug.cgi?id=7172
>
> Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
> Cc: Mike Zick <minimod at morethan.org>
> ---
>  docs/manual/known-issues.txt  | 4 ++++
>  toolchain/toolchain-common.in | 3 +++
>  2 files changed, 7 insertions(+)
>
> diff --git a/docs/manual/known-issues.txt b/docs/manual/known-issues.txt
> index 08469e9..5eaded9 100644
> --- a/docs/manual/known-issues.txt
> +++ b/docs/manual/known-issues.txt
> @@ -3,6 +3,10 @@
>
>  = Known issues
>
> +* It is not possible to pass extra linker options via +BR2_TARGET_LDFLAGS+
> +  if such options contain a +$+ sign. For example, the following is known
> +  to break: +BR2_TARGET_LDFLAGS="-Wl,-rpath=\'$ORIGIN/../lib'"+
> +
>  * The +ltp-testsuite+ package does not build with the default uClibc
>    configuration used by the Buildroot toolchain backend. The LTP
>    testsuite uses several functions that are considered obsolete, such
> diff --git a/toolchain/toolchain-common.in b/toolchain/toolchain-common.in
> index 13de9e5..2df8ddb 100644
> --- a/toolchain/toolchain-common.in
> +++ b/toolchain/toolchain-common.in
> @@ -132,6 +132,9 @@ config BR2_TARGET_LDFLAGS
>         help
>           Extra options to pass to the linker when building for the target.
>
> +         Note that options with a '$' sign (eg. -Wl,-rpath='$ORIGIN/../lib')
> +         are not supported.
> +
>  config BR2_ECLIPSE_REGISTER
>         bool "Register toolchain within Eclipse Buildroot plug-in"
>         help


Reviewed-by: Thomas De Schampheleire <thomas.de.schampheleire at gmail.com>



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