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On 2014-01-22 09:04, Sébastien Fabbro wrote: |
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> On Tue, Jan 21, 2014 at 11:26 AM, Reinis Danne <rei4dan@×××××.com> |
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> wrote: |
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> |
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>> How the eselect module creation could work? Something like this? |
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>> |
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>> ~# eselect module create blas |
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>> ~# eselect blas add atlas importance src dest [src dest [..]] |
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>> ... |
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>> ~# eselect blas remove atlas |
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>> ~# eselect delete blas |
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> |
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> |
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> |
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> That is the idea. Last one should be "eselect module delete blas". |
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> |
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> |
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>>> * given the number of bugs, we should keep the linking to the |
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>> reference |
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>>> names libraries, so we could eselect providers without |
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>> re-compiling all |
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>>> reverse dependencies. We could do this in the open sourced |
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>> providers by |
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>>> changing the soname of the libraries we compile, and in the |
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>> binary ones |
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>>> (mkl,amcl...) with a link script generated library. |
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>> |
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>> Yes, this is ok and AFAICT it is like that now in the overlay. |
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> |
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> |
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> It is not. Let's take blas for example. Install openblas and |
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> blas-reference, then eselect blas reference. Then install |
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> lapack-reference, then remove blas-reference. You will have to |
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> re-install lapack-reference, because of a missing reference to |
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> librefblas.so. If openblas had the libblas.so soname and link, you |
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> would not have to. I'm actually not sure whether it is a side effect |
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> of our as-needed policy. |
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> |
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|
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Just to make sure the message is clear, I use openblas: |
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readelf -d /usr//lib64/libreflapack.so |
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|
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Dynamic section at offset 0x4f9e08 contains 26 entries: |
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Tag Type Name/Value |
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0x0000000000000001 (NEEDED) Shared library: |
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[libopenblas.so.0] |
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0x0000000000000001 (NEEDED) Shared library: |
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[libgfortran.so.3] |
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0x0000000000000001 (NEEDED) Shared library: [libm.so.6] |
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0x0000000000000001 (NEEDED) Shared library: [libgcc_s.so.1] |
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0x0000000000000001 (NEEDED) Shared library: [libc.so.6] |
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0x000000000000000e (SONAME) Library soname: |
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[libreflapack.so] |
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|
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So the soname is embedded in the shared object and the linker will look |
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for it |
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at runtime. Remove openblas and my reflapack is broken in spite of the |
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fact that |
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I have 2 other blas on the system. |
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