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Re: [RFC] How to add vector math functions to Glibc
- From: Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>
- To: "Joseph S. Myers" <joseph at codesourcery dot com>
- Cc: "Carlos O'Donell" <carlos at redhat dot com>, libc-alpha <libc-alpha at sourceware dot org>
- Date: Wed, 1 Oct 2014 22:46:52 +0400
- Subject: Re: [RFC] How to add vector math functions to Glibc
- Authentication-results: sourceware.org; auth=none
- References: <CAMXFM3tjquzniXP1weqxSVFJyhXqsf2PHuyrrrmqp7K0ZzORqA at mail dot gmail dot com> <CAMXFM3sGMNX1DEPAMt7qUR4UREF_xUAQjCG1OjBiZH2aoOFiPA at mail dot gmail dot com> <Pine dot LNX dot 4 dot 64 dot 1409181551370 dot 31607 at digraph dot polyomino dot org dot uk> <CAMXFM3tO7MTYCq8-YFZacdbLvR4iAab_n04AuB+rp2Phs4BvQg at mail dot gmail dot com> <Pine dot LNX dot 4 dot 64 dot 1409242011260 dot 7597 at digraph dot polyomino dot org dot uk> <CAMXFM3tqiqUNuSU2KXvAFM-QescX3+6xUO9=z5X0Ac6C9qJ7zg at mail dot gmail dot com> <CAMe9rOq7bZHb8R=opUzSmAMGWjLpX21mR=Sx96cuBph=TTtDXA at mail dot gmail dot com> <54246CB5 dot 7020908 at redhat dot com> <CAMe9rOoLmJ2jHWmERoB0M83WNKovJOgh0--Kquw9O86A1tPU0g at mail dot gmail dot com> <5424733D dot 6010305 at redhat dot com> <CAMe9rOpacze055qyBFzz3M-b-GNtXCqZzMmkScBL9a94zVj28g at mail dot gmail dot com> <54247FAB dot 6050002 at redhat dot com> <CAMXFM3v8narOLMHC5U=fvyTFWV6s4ZACN-UrAC4fAcUs9SOFfA at mail dot gmail dot com> <54257507 dot 9070508 at redhat dot com> <CAMXFM3vOLspQtHxgJfD_Emht480w2RMbiwnEH6A_LhoS-JZFag at mail dot gmail dot com> <Pine dot LNX dot 4 dot 64 dot 1409301620020 dot 15186 at digraph dot polyomino dot org dot uk>
>> +# We need to install libm.so as linker script
>> +# for more comfortable use of vector math library.
>> +subdir_install: $(inst_libdir)/libm.so
>> +
>> +$(inst_libdir)/libm.so: $(common-objpfx)format.lds \
>> + $(common-objpfx)math/libm.so$(libm.so-version) \
>> + $(common-objpfx)mathvec/libmvec.so$(libmvec.so-version) \
>> + $(+force)
>> + (echo '/* GNU ld script */';\
>> + cat $<; \
>> + echo 'GROUP ( $(slibdir)/libm.so$(libm.so-version) ' \
>> + 'AS_NEEDED ( $(slibdir)/libmvec.so$(libmvec.so-version) ) )' \
>> + ) > $@.new
>> + mv -f $@.new $@
>
> Do you have ordering issues here? It seems bad for math/ to install a
> direct symlink and then mathvec/ to change it to something else - all
> installation rules for libm should be in the math/ directory.
Inserted in math/Makefile this rule produces warning about overriding
recipe for target libm.so (as I see rule for libm.so was already
generated from o-iterator.mk).
If use temporary target:
+subdir_install: $(inst_libdir)/libm.so.tmp
+$(inst_libdir)/libm.so.tmp: $(common-objpfx)format.lds \
+ $(common-objpfx)math/libm.so$(libm.so-version) \
+ $(common-objpfx)mathvec/libmvec.so$(libmvec.so-version) \
+ $(+force)
+ (echo '/* GNU ld script */';\
+ cat $<; \
+ echo 'GROUP ( $(slibdir)/libm.so$(libm.so-version) ' \
+ 'AS_NEEDED ( $(slibdir)/libmvec.so$(libmvec.so-version) ) )' \
+ ) > $@
+ mv -f $@ $(inst_libdir)/libm.so
$(inst_libdir)/libm.so became overwritten later.
So I have temporary file and need to move it to $(inst_libdir)/libm.so
at the end.
If would be great if someone can give me advice how to do it.
--
WBR,
Andrew