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Test hooks of mpdecimal-testit

The long tests of mpdecimal-testit-2.5.1 (testit-2.5.1/libmpdec/tests) need a library built from testit's own mpdecimal.c and mpalloc.c, which differ from those of the mpdecimal-2.5.1 release exactly by testit-hooks.patch (rebased to 4.0.1, where it applies without changes to its hunks):

  • mpd_qsshiftr, _mpd_kmul, _mpd_fntmul, _mpd_kmul_fnt (and mpd_set_fenv, CONFIG_32 without ANSI only) are external instead of static;
  • fault injection: the globals func_count, func_fail with mpd_set_func_fail(), mpd_set_func(), and FAILPOINT() checks in mpd_qadd_exact, mpd_qsub_exact, mpd_qmul_exact, mpd_sizeinbase, mpd_qimport_size;
  • Newton division test entry points mpd_test_newtondiv, mpd_test_newtondivint, mpd_test_newtonrem, mpd_test_newtondivmod;
  • mpalloc.c: an allocation size check for MPD_SIZE_MAX < SIZE_MAX (the full_coverage configuration only; false in CONFIG_64 and CONFIG_32).

prepare.py --test-hooks applies the patch to a copy of the sources and adds a #line directive after each changed region, so that __LINE__ and __FILE__ (mpd_err_fatal) are those of the unpatched 4.0.1 sources and the translation differs from the one without the patch only by the changes above.

In the merged crate, the translation with the patch is selected by the cargo feature test-hooks (merge.py --feature test-hooks). The feature is for the long tests only: FAILPOINT() updates the unsynchronized globals in the arithmetic functions.

The patch was checked against the releases with

diff -u mpdecimal-2.5.1/libmpdec/mpdecimal.c testit-2.5.1/libmpdec/mpdecimal.c
diff -u mpdecimal-2.5.1/libmpdec/mpalloc.c testit-2.5.1/libmpdec/mpalloc.c

whose hunks are those of testit-hooks.patch.