[Buildroot] [PATCH] uclibc: add simlinks from libdl/libm/libpthread/librt

Yann E. MORIN yann.morin.1998 at free.fr
Sun Jun 14 15:00:21 UTC 2020


Paul, All,

On 2020-06-13 18:20 +0200, Paul Cercueil spake thusly:
> All the symbols that were previously present in libdl.so.0, libm.so.0,
> libpthread.so.0 and librt.so.0 are now all packed within uClibc.
> 
> In order to keep binary compatibility with old executables, which were
> dynamically linked with one of the libraries above, add symbolic links
> to the uClibc shared library.
> 
> Signed-off-by: Paul Cercueil <paul at crapouillou.net>
> ---
>  package/uclibc/uclibc.mk | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/package/uclibc/uclibc.mk b/package/uclibc/uclibc.mk
> index 3ba4589672..73664d5b0b 100644
> --- a/package/uclibc/uclibc.mk
> +++ b/package/uclibc/uclibc.mk
> @@ -424,6 +424,10 @@ define UCLIBC_INSTALL_TARGET_CMDS
>  		RUNTIME_PREFIX=/ \
>  		install_runtime
>  	$(UCLIBC_INSTALL_UTILS_TARGET)
> +	ln -sf libuClibc-$(UCLIBC_VERSION).so $(TARGET_DIR)/lib/libdl.so.0
> +	ln -sf libuClibc-$(UCLIBC_VERSION).so $(TARGET_DIR)/lib/libm.so.0
> +	ln -sf libuClibc-$(UCLIBC_VERSION).so $(TARGET_DIR)/lib/libpthread.so.0
> +	ln -sf libuClibc-$(UCLIBC_VERSION).so $(TARGET_DIR)/lib/librt.so.0

This does not account for external toolchains.

I wonder how good those symlinks are anyway: uClibc has no ABI/API
stability anyway, so there are no guarantee that a program linked
against a version of uClibc will work against another version, or even
the same version that was compiled with another configuration...

And I am not sure we want to condone such a case.

My opinion would be that, if you really need those legacy symlinks,
then you should create them in a post-build script.

I'm leaving this patch opened in patchwork, so other maintainers may
reverse my position.

Regards,
Yann E. MORIN.

>  endef
>  
>  # STATIC has no ld* tools, only getconf
> -- 
> 2.27.0
> 
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