Bug#888422: libmpfr6 should add Breaks: libmpfr4
Package: libmpfr6
Version: 4.0.0-5
Severity: serious
Mixing libmpfr4 and libmpfr6 doesn't work well:
flint-arb FTBFS with:
/usr/bin/ld: warning: libmpfr.so.4, needed by /usr/lib/libflint.so, may conflict with libmpfr.so.6
/usr/bin/ld: mpfr_free_func: TLS definition in //usr/lib/x86_64-linux-gnu/libmpfr.so.4 section .tbss mismatches non-TLS definition in /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libmpfr.so section .text
//usr/lib/x86_64-linux-gnu/libmpfr.so.4: error adding symbols: Bad value
collect2: error: ld returned 1 exit status
Some packages like fractalnow FTBFS when gcc and libmpc3 use
different mpfr libraries, with a gcc ICE:
../../src/init2.c:52: MPFR assertion failed: p >= 2 && p <= ((mpfr_prec_t)((mpfr_uprec_t)(~(mpfr_uprec_t)0)>>1))
src/fractal_compute_engine.c: In function 'FractalLoopMANDELBROTPINTAVERAGECOLORINGDISCRETECURVATURENONESINGLE':
src/fractal_compute_engine.c:285:1: internal compiler error: Aborted
It is not even obvious in the latter case that this is always only an ICE,
and not sometimes a miscompilation.
The libmpc3 issue is also expected to hit users who have older gcc versions
still installed, e.g. gcc-6 still installed after stretch->buster upgrade.
When the dependencies are fulfilled users can expect to have working software,
even a forced removal on stretch->buster upgrades is better than runtime problems.
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