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<a href="https://gitlab.rtems.org/jjl77">Jeremy Lorelli</a> created a merge request: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/937">!937</a>
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Project:Branches: jjl77/rtems:pr-m68k-ldbl-eq-dbl-fix to rtems/rtos/rtems:main
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Author: Jeremy Lorelli
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<a href="#summary" aria-hidden="true" class="anchor" id="user-content-summary" style="margin-top: 0; margin-left: -20px; text-decoration: none; outline: none; position: absolute; width: 20px;"></a>Summary</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">bsps/m68k: Add -D_LDBL_EQ_DBL=1 workaround to ABI_FLAGS</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">This is to workaround a difficult bug in newlib related to
configure-time generation of this flag in newlib.h. Since there is no
multi-lib mechanism for headers, _LDBL_EQ_DBL ends up in newlib.h, which
is installed architecture wide. The default -mcpu= setting for the 68k
toolchain does support long double, so this flag is not defined in
newlib.h.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">However, Coldfire targets lack support for long double, leading to some
undesirable behavior in the C/C++ standard headers. ieeefp.h has
numerous sanity checks that will #error and from C++ will fail
to compile.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">It doesn't look like this issue will ever be fixed in newlib, so we'll
just define this manually as a workaround.</p>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">Related newlib mailing list discussion: <a href="https://inbox.sourceware.org/newlib/510a1937-312e-b61e-4973-ad573b935fdb@LGSInnovations.com/" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">https://inbox.sourceware.org/newlib/510a1937-312e-b61e-4973-ad573b935fdb@LGSInnovations.com/</a></p>
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