<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Book Antiqua";
panose-1:2 4 6 2 5 3 5 3 3 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Book Antiqua",serif;
color:windowtext;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-IE link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>Recently I had noticed a significant change in the handling of Locales and Newlib v2.5.0, and this has been address in recent patches to the head revision of CLang.<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'>But I have come across a more subtle change in the handling of ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'><stdint.h></span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’ and the ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'><inttypes.h></span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’ header with Newlib v2.5.0 versus v2.2.0.<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'>In this case the “portable” formatting macros such as ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'>PRIx64</span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’ suddenly stopped working when I switched to Newlib v2.5.0 from Newlib v2.2.0 for our “free-standing” target.<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'>Most of the ISO C headers we use come from Newlib, but the ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'><stdint.h></span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’ that we use comes from CLang (‘</span><span style='font-size:12.0pt;font-family:"Courier New"'>clang/lib/Headers/stdint.h</span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’), and this has a subtle incompatibility with the other headers from Newlib v2.5.0 such as ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'><inttypes.h></span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’, in that the macro ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'>__int64_t_defined</span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’ is no longer defined as a consequence of other changes in Newlib, but which is defined if I use the Newlib version of ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'><stdint.h></span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’. However, I find the CLang version of this header more reliable and prefer to use it.<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'>There is a very simple change which can be made to CLang’s ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'><stdint.h></span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’ that works with Newlib v2.5.0 and which is also backward compatible with older versions of Newlib, and that is to add the following to CLang’s ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'><stdint.h></span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’ in the ‘</span><span style='font-size:12.0pt;font-family:"Courier New"'>#else</span><span style='font-size:12.0pt;font-family:"Book Antiqua",serif'>’ clause for the Free-standing vs Hosted check (Line 104 in the CLang v4.0.0 release sources):<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"'>#ifdef __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"'># include <sys/_stdint.h><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 /* __NEWLIB__ */<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'>I have tested this with Newlib v2.2.0 and v2.5.0, and after visual inspection I see no reason that it will not work for all versions of Newlib in between. I have not checked older versions of Newlib. Also, since I am not building a Hosted compiler, I have not checked if a similar change is necessary for the hosted case.<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></div></body></html>