[Buildroot] [PATCH 3/6] package/Makefile.in: Use gcc spec files for PIE build flags

[Jan Kundrát]

Hi Matt, thanks for working on this.

When I apply this patch, I'm getting a build failure from an out-of-tree 
[1] package, see the attached log. The package lives at [1], the Buildroot 
recipe is pretty straightforward [2]. Here's the relevant snippet from the 
failure:

  /home/jkt/work/prog/_build/br-cfb/host/bin/arm-linux-gnueabihf-gcc -Wall 
-Wl,-z -Wl,now -Wl,-z -Wl,relro 
-specs=/home/jkt/work/cesnet/gerrit/github/buildroot/buildroot/toolchain/gcc-specs-pie-ld 
-o .libs/example example.o  ./.libs/libredblack.so
  
/home/jkt/work/prog/_build/br-cfb/host/opt/ext-toolchain/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: 
example.o: relocation R_ARM_MOVW_ABS_NC against `stderr' can not be used 
when making a shared object; recompile with -fPIC

Is that a failure of that particular package, or a problem in the compiler 
specs?

Also, Gentoo Linux has been doing compiler hardening for years and their 
specs appear to be more complex according to the docs [4]. I have no clue 
if that extra complexity is needed in Buildroot.

With kind regards,
Jan

[1] I'll submit them once my patches reach a release upstream.
[2] https://github.com/sysrepo/libredblack
[3] 
https://gerrit.cesnet.cz/plugins/gitiles/github/buildroot/buildroot/+/a0cff08df5918e1721723400da42c8c68b8c0928%5E%21/
[4] https://wiki.gentoo.org/wiki/Hardened/Toolchain
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