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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>A question to the more knowledgeable to try to clarify what is the expected behaviour when compiling with EHABI exception handling enabled (i.e. the current default for ARM) ....<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Should the EHABI directives (.fnstart/.fnend/.push/.pad/.setfp etc) always be generated (and thus resulting in the generation of .ARM.extab & .ARM.exidx sections), or should these directives only be generated when there are unwind tables to be described?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>At the moment, even when compiling C code the .ARM.extab and .ARM.exidx sections are being generated .... is this the desired behaviour? This is more what I would have expected if compiling C with –funwind-tables, but maybe my expectations are wrong.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Keith<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Renato Golin [mailto:renato.golin@linaro.org] <br><b>Sent:</b> 01 February 2014 23:35<br><b>To:</b> Evgeniy Stepanov<br><b>Cc:</b> reviews+D2666+public+b787a0c00c984fea@llvm-reviews.chandlerc.com; Alexey Samsonov; Reid Kleckner; Keith Walker; Clang Commits; Joey Gouly<br><b>Subject:</b> Re: [PATCH] Disable EHABI when -fno-exceptions option is chosen.<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><div><p class=MsoNormal>On 1 February 2014 19:17, Evgeniy Stepanov <<a href="mailto:eugenis@google.com" target="_blank">eugenis@google.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal>We build sanitizer runtimes with exceptions disabled, because<br>otherwise we get a libstdc++ dependency, which is not a good thing.<br>Your last change effectively hardcodes the value of -arm-disable-ehabi<br>option - I can not override it on the command line, because now it is<br>always present in cc1 flags.<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Ah, this is bad.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>We can discuss more in the main list, maybe even jump directly to using -munwind-tables instead. But for now let's play it safe. I'm at FOSDEM right now, but feel free to revert it. If not, I'll do it on Monday. Sorry about that. (some problems only show up when you break things ;)<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>cheers,<o:p></o:p></p></div><div><p class=MsoNormal>--renato<o:p></o:p></p></div></div></div></div></body></html>