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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">I have been working on stabilising our out-of-tree sources following the upgrade to the v5.0 Final Release, and came across an incompatibility between the ‘</span><span style="font-size:12.0pt;font-family:"Courier New""><stdio.h></span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’
provided with Newlib v2.5.0 and the one provided with LibC++ v5.0.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">The problem is how LibC++ handles the ‘</span><span style="font-size:12.0pt;font-family:"Courier New"">getc</span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’
and ‘</span><span style="font-size:12.0pt;font-family:"Courier New"">putc</span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’ implementations, and if these are defined it uses a shim, then ‘</span><span style="font-size:12.0pt;font-family:"Courier New"">#undef</span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’s
the original, and redefines them as functions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">In general this is a good strategy, but in this case ‘</span><span style="font-size:12.0pt;font-family:"Courier New"">getc</span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’
and ‘</span><span style="font-size:12.0pt;font-family:"Courier New"">putc</span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’ are both declared as external functions, and subsequently defined as macros. When LibC++ undefines these macros
and defines the functions ‘</span><span style="font-size:12.0pt;font-family:"Courier New"">getc</span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’ and ‘</span><span style="font-size:12.0pt;font-family:"Courier New"">putc</span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’,
it does so appending ‘</span><span style="font-size:12.0pt;font-family:"Courier New"">_NOEXCEPT</span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’ and this causes a multiple definition conflict with the declaration in Newlib’s ‘</span><span style="font-size:12.0pt;font-family:"Courier New""><stdio.h></span><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">’
which does not have this appended.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">My workaround was to rewrite these as:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">#ifndef __NEWLIB__<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">int getc(FILE *__lcpp_x) _NOEXCEPT {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">#else<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">int getc(FILE *__lcpp_x)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">#endif<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">and:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">#ifndef __NEWLIB__<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">int petc(int __lcpp_x, FILE *__lcpp_y) _NOEXCEPT {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">#else<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">int petc(int __lcpp_x, FILE *__lcpp_y)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:12.0pt;font-family:"Courier New"">#endif<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif">All the best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"> MartinO<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Book Antiqua",serif"><o:p> </o:p></span></p>
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