Date: Sun, 10 Mar 2024 18:44:25 -0700 From: "Jin Guojun[VFF]" <jguojun@gmail.com> To: Paul Procacci <pprocacci@gmail.com> Cc: freebsd-questions <freebsd-questions@freebsd.org>, freebsd-hackers@freebsd.org Subject: Re: weird compiler error in 13.3-R Message-ID: <1905d799-7251-4343-b53c-6b665ff88866@gmail.com> In-Reply-To: <CAFbbPui9GjEaL-RCXYCBXJr6V5or7_72v8wr3=AZrcNM-qT6FQ@mail.gmail.com> References: <4d6edaa6-237d-4207-9047-ddee78ee4b90@gmail.com> <CAFbbPui9GjEaL-RCXYCBXJr6V5or7_72v8wr3=AZrcNM-qT6FQ@mail.gmail.com>
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This is a multi-part message in MIME format. --------------joK2SjmRaYGe8pjGzeKuhiKD Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit The problem is not type conversion issue described in compiling message . If the problem is a conversion issue, then it is easy to fix in coding. The problem is compiler treated va_list as unsigned in in line 119, then treated va_list as a structure pointer. This looks like a compiler bug. +hackers to see if someone knows what happened in the new compiler. -Jin On 3/10/24 00:43, Paul Procacci wrote: > https://reviews.llvm.org/D129881 > > The author of the change can explain it better than anyone else here. > > ~Paul > > On Sun, Mar 10, 2024 at 4:24 AM Jin Guojun[VFF] <jguojun@gmail.com> wrote: > > Updated 13.2 to 13.3 and get a weird compiling failure. The code > compiled since FreeBSD release 4 till release 13.2. > > Both ap (line 119) and vap (line 126) are declared as va_list, > somehow > clang version 17.0.6 thinks va_list at line 119 is uint, > > where va_list in line 126 is 'struct __va_list_tag *'. > > Checked /usr/include and va_list is declared in > /usr/include/sys/_stdarg.h:39: typedef __va_list va_list; > included by /usr/include/stdarg.h via x86/stdarg.h > > Does anyone have ideas on what could cause such compiling failure? > > -Jin > > 10 #include <stdarg.h> > 11 #include <stdio.h> > > 118 struct a_build_ctrl_t { > 119 va_list ap; /* what is different from > vap > at line 126? */ > 120 argu_type last_arg_t; > 121 }; > 124 > 125 arg_fmt_lists* > 126 build_arg_fmt_list(arg_fmt_list_string* fmt, va_list vap) > 127 { > 128 int na=1; > 129 > 130 arg_fmt_lists* aflp; > 131 arg_fmt_lists* aflp_top; > 132 > 133 struct a_build_ctrl_t abc = {.ap=vap, > last_arg_t=ARGU_NONE}; > > ... > > } > > test.c:133:34: error: incompatible pointer to integer conversion > initializing 'unsigned int' with an expression of type 'struct > __va_list_tag *' [-Wint-conversion] > 133 | struct a_build_ctrl_t abc = {.ap=vap, > .last_arg_t=ARGU_NONE}; > > > > > -- > __________________ > > :(){ :|:& };: --------------joK2SjmRaYGe8pjGzeKuhiKD Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <div class="moz-cite-prefix">The problem is not type conversion issue described in compiling message . If the problem is a conversion issue, then it is easy to fix in coding.<br> <div class="moz-cite-prefix"><br> </div> </div> <div class="moz-cite-prefix">The problem is compiler treated va_list as unsigned in in line 119, then treated va_list as a structure pointer. This looks like a compiler bug.</div> <div class="moz-cite-prefix"><br> </div> <div class="moz-cite-prefix">+hackers to see if someone knows what happened in the new compiler.</div> <div class="moz-cite-prefix"><br> </div> <div class="moz-cite-prefix">-Jin</div> <div class="moz-cite-prefix"><br> </div> <div class="moz-cite-prefix">On 3/10/24 00:43, Paul Procacci wrote:<br> </div> <blockquote type="cite" cite="mid:CAFbbPui9GjEaL-RCXYCBXJr6V5or7_72v8wr3=AZrcNM-qT6FQ@mail.gmail.com"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <div dir="ltr"> <div><a href="https://reviews.llvm.org/D129881" moz-do-not-send="true" class="moz-txt-link-freetext">https://reviews.llvm.org/D129881</a><br>; <br> </div> <div>The author of the change can explain it better than anyone else here.<br> <br> </div> ~Paul<br> </div> <br> <div class="gmail_quote"> <div dir="ltr" class="gmail_attr">On Sun, Mar 10, 2024 at 4:24 AM Jin Guojun[VFF] <<a href="mailto:jguojun@gmail.com" moz-do-not-send="true" class="moz-txt-link-freetext">jguojun@gmail.com</a>> wrote:<br> </div> <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Updated 13.2 to 13.3 and get a weird compiling failure. The code <br> compiled since FreeBSD release 4 till release 13.2.<br> <br> Both ap (line 119) and vap (line 126) are declared as va_list, somehow <br> clang version 17.0.6 thinks va_list at line 119 is uint,<br> <br> where va_list in line 126 is 'struct __va_list_tag *'.<br> <br> Checked /usr/include and va_list is declared in <br> /usr/include/sys/_stdarg.h:39: typedef __va_list va_list;<br> included by /usr/include/stdarg.h via x86/stdarg.h<br> <br> Does anyone have ideas on what could cause such compiling failure?<br> <br> -Jin<br> <br> 10 #include <stdarg.h><br> 11 #include <stdio.h><br> <br> 118 struct a_build_ctrl_t {<br> 119 va_list ap; /* what is different from vap <br> at line 126? */<br> 120 argu_type last_arg_t;<br> 121 };<br> 124<br> 125 arg_fmt_lists*<br> 126 build_arg_fmt_list(arg_fmt_list_string* fmt, va_list vap)<br> 127 {<br> 128 int na=1;<br> 129<br> 130 arg_fmt_lists* aflp;<br> 131 arg_fmt_lists* aflp_top;<br> 132<br> 133 struct a_build_ctrl_t abc = {.ap=vap, <br> last_arg_t=ARGU_NONE};<br> <br> ...<br> <br> }<br> <br> test.c:133:34: error: incompatible pointer to integer conversion <br> initializing 'unsigned int' with an expression of type 'struct <br> __va_list_tag *' [-Wint-conversion]<br> 133 | struct a_build_ctrl_t abc = {.ap=vap, .last_arg_t=ARGU_NONE};<br> <br> <br> </blockquote> </div> <br clear="all"> <br> <span class="gmail_signature_prefix">-- </span><br> <div dir="ltr" class="gmail_signature">__________________<br> <br> :(){ :|:& };:</div> </blockquote> <p><br> </p> </body> </html> --------------joK2SjmRaYGe8pjGzeKuhiKD--
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