Bug#837454: flint-arb: FTBFS with bindnow and PIE enabled

[Balint Reczey]

Source: flint-arb
Version: 2.8.1-2
Severity: important
User: balint at balintreczey.hu
Usertags: pie-bindnow-20160906
Justification: FTBFS on amd64 with extra hardening

Hi,

During a rebuild of all packages in sid, your package failed to build on
amd64 with patched GCC and dpkg.

The rebuild tested if packages are ready for a transition
enabling PIE and bindnow for amd64.

For more information about the changes to sid's dpkg and GCC please
visit:
 https://wiki.debian.org/Hardening/PIEByDefaultTransition

Relevant part (hopefully):
...
gcc -Wl,-z,relro -Wl,-z,now -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2
-fdebug-prefix-map=/<<PKGBUILDDIR>>
=. -fstack-protector-strong -Wformat -Werror=format-security -Wl,-r
../build/fmpr/add_naive.lo ../buil
d/fmpr/get_si.lo ../build/fmpr/get_fmpz_2exp.lo ../build/fmpr/get_d.lo
../build/fmpr/set_mpfr.lo ../bu
ild/fmpr/cmp_2exp_si.lo ../build/fmpr/addmul.lo ../build/fmpr/add_eps.lo
../build/fmpr/set_d.lo ../bui
ld/fmpr/set_fmpz_2exp.lo ../build/fmpr/cmpabs_2exp_si.lo
../build/fmpr/divappr_abs_ubound.lo ../build/
fmpr/log.lo ../build/fmpr/add_fmpz.lo ../build/fmpr/mul_naive.lo
../build/fmpr/ulp.lo ../build/fmpr/ex
p.lo ../build/fmpr/check_ulp.lo ../build/fmpr/sum.lo
../build/fmpr/root.lo ../build/fmpr/cmp.lo ../bui
ld/fmpr/set_round.lo ../build/fmpr/set_round_uiui_2exp_fmpz.lo
../build/fmpr/mul.lo ../build/fmpr/get_
fmpz_fixed.lo ../build/fmpr/cmpabs.lo ../build/fmpr/printd.lo
../build/fmpr/get_fmpq.lo ../build/fmpr/
get_fmpz.lo ../build/fmpr/randtest.lo ../build/fmpr/rsqrt.lo
../build/fmpr/set_round_mpn.lo ../build/fmpr/pow_sloppy.lo
../build/fmpr/submul.lo ../build/fmpr/add.lo ../build/fmpr/mul_1x1.lo
../build/fmpr/mul_fmpz.lo ../build/fmpr/sqrt.lo ../build/fmpr/add_si.lo
../build/fmpr/cmpabs_ui.lo ../build/fmpr/div.lo
../build/fmpr/normalise.lo ../build/fmpr/set_fmpq.lo
../build/fmpr/abs_bound_lt_2exp_si.lo ../build/fmpr/print.lo
../build/fmpr/get_mpfr.lo ../build/fmpr/sub.lo ../build/fmpr/add_ui.lo
../build/fmpr/mul_mpn.lo ../build/fmpr/add_mpn.lo
../build/fmpr/set_round_ui_2exp_fmpz.lo -o ../build/fmpr/../fmpr.lo
-nostdlib
/usr/bin/ld: -r and -pie may not be used together
collect2: error: ld returned 1 exit status
...

The full build log is available from:
 https://people.debian.org/~rbalint/build-logs/pie-bindnow-20160906/flint-arb_2.8.1-2_amd64.build.gz

The patch used in Ubuntu fixes the issue:
https://patches.ubuntu.com/f/flint-arb/flint-arb_2.8.1-2ubuntu1.patch

Thanks,
Balint