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math: don't clobber old libm.so on install [BZ #19822]

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When installing glibc (w/mathvec enabled) in-place on a system with
a glibc w/out mathvec enabled, the install will clobber the existing
libm.so (e.g., /lib64/libm-2.21.so) with a linker script.  This is
because libm.so is a symlink to libm.so.6 which is a symlink to the
final libm-2.21.so file.  When the makefile writes the linker script
directly to libm.so, it gets clobbered.

The simple patch below to math/Makefile fixes this.  It is based on
the nptl Makefile, which does exactly the same thing in a safer way.
This commit is contained in:
Dylan Alex Simon 2016-03-15 13:20:01 -04:00 committed by Mike Frysinger
parent 6bc81cf205
commit f9378ac377
2 changed files with 8 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2016-03-21 Dylan Alex Simon <dylan-sourceware@dylex.net>
[BZ #19822]
* math/Makefile ($(inst_libdir)/libm.so): Write output to $@.tmp and
move it to the final $@ location.
2016-03-20 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sysdeps/unix/sysv/linux/spawni.c (__spawnix): Fix invalid memory

3
math/Makefile
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@ -100,7 +100,8 @@ $(inst_libdir)/libm.so: $(common-objpfx)format.lds \
cat $<; \
echo 'GROUP ( $(slibdir)/libm.so$(libm.so-version) ' \
'AS_NEEDED ( $(libdir)/libmvec_nonshared.a $(slibdir)/libmvec.so$(libmvec.so-version) ) )' \
) > $@
) > $@.new
mv -f $@.new $@
endif
# Rules for the test suite.