DCMTK

The Debian team has changed the default behavior for ieee double float (excess precision=standard) for the i386 platform when using GCC 13.
This leads to a number of failures of DCMTK's unit tests:

• ofstd_OFTime
• ofstd_variant
• dcmdata_decimalString_1
• dcmdata_decimalString_2
• dcmdata_decimalString_3
• dcmdata_floatingPointDouble
• dcmfg_ct_acquisition_type

Some examples of failed test cases:

• FAILED test 'dcmdata_decimalString_1' at ./dcmdata/tests/tvrds.cc:41: (-4.99) should equal (-4.99)
• FAILED test 'dcmdata_decimalString_1' at ./dcmdata/tests/tvrds.cc:42: (500.005) should equal (500.005)
• FAILED test 'dcmdata_decimalString_1' at ./dcmdata/tests/tvrds.cc:43: (0.666) should equal (0.666)

All test failures essentially boil down to this: OFStandard::atof("-4.99") != -4.99, for given pairs of string and double.
It is most likely related to the changed handling of floating point numbers caused by -fexcess-precision=standard, which is only supported for C++ code starting with GCC 13.