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45 <h1 align="center">Compiling DragonFly BSD using llvm/clang </h1>
48 <h2> THIS NEEDS AN UPDATE !!!! </h2>
52 This page tracks the progress on an effort to compile DragonFly with llvm/clang instead of gcc.
57 <pre class="programlisting">
59 env WORLD_CCVER=clang make -DNO_GCC44 buildworld
60 env WORLD_CCVER=clang make buildkernel KERNCONF=...
64 <h2>HostInfo patch</h2>
65 <strike>This <a href="http://leaf.dragonflybsd.org/~alexh/clang/clang_ccclib.patch">patch</a> enables a DragonFly BSD target for ccc with its own toolchain configuration.</strike>
70 llvm/clang bug <a href="http://llvm.org/bugs/show_bug.cgi?id=3812">#3812</a> was reopened as it seems to be an actual bug. The patch (atomic.patch) is only intended to be TEMPORARY and will kill gcc compatibility! I will update this as soon as a llvm/clang is fixed.
73 <h2>Status (Kernel/pc32)</h2>
76 <tr><td><b>Type</b> </td><td><b>llvm/clang revision</b></td><td><b>Status</b> </td><td><b>Remarks</b></td></tr>
78 <tr><td >GENERIC </td><td >66925 </td><td >Doesn't compile</td><td >Filed llvm/clang bug <a
79 href="http://llvm.org/bugs/show_bug.cgi?id=3805"><strike>#3805</strike></a></td></tr>
81 <tr><td >GENERIC </td><td >67025 </td><td >Doesn't link (ncr, nsp, tmc) </td><td ><a href="http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/bd65e5279418f9630b54e4e33fd72d348e88c955">This commit</a> should fix it</td></tr>
83 <tr><td >GENERIC </td><td >67025 </td><td >Compiles, doesn't boot</td><td >(see Current Log) - Filed
84 llvm/clang bug <a href="http://llvm.org/bugs/show_bug.cgi?id=3812">#3812</a>. </td></tr>
86 <tr><td >GENERIC </td><td >67025 </td><td >Boots, seems to work ok </td><td >network adapters removed from system</td></tr>
87 <tr><td >GENERIC </td><td >67025 </td><td >Boots, survives stress test (buildworld)</td><td></td></tr>
91 <h2>Status (Userland/pc32)</h2>
94 <tr><td><b>Type</b> </td><td><b>llvm/clang revision</b></td><td><b>Status</b> </td><td><b>Problem area</b></td><td><b>Remarks</b></td></tr>
95 <tr><td >world </td><td >67025 </td><td >Doesn't compile </td><td>all</td><td > Filed llvm/clang bug <a
96 href="http://llvm.org/bugs/show_bug.cgi?id=3853"><strike>#3853</strike></a> </td></tr>
97 <tr><td >world </td><td >69545 </td><td >Partially compiles </td><td >lib/libc</td><td >Issue with zero-size arrays (see note below), filed llvm/clang bug <a
98 href="http://llvm.org/bugs/show_bug.cgi?id=4020">#4020</a> Edit: <a href="http://gitweb.dragonflybsd.org/dragonfly.git/commit/c4b81afc2638e5b2a17902644721fc0594615287">This commit</a> solves this issue</td></tr>
103 <h2>Related llvm/clang bug reports</h2>
106 <tr><td><b></b>Bug #</td><td><b>Bug Description</b></td><td><b>Affects</b> </td><td><b>Status</b></td></tr>
107 <tr><td ><a href="http://llvm.org/bugs/show_bug.cgi?id=3805">3805</a></td><td >ccc ignores -x assembler-with-cpp</td><td>build of locore.s</td><td >Fixed</td></tr>
108 <tr><td ><a href="http://llvm.org/bugs/show_bug.cgi?id=3812">3812</a></td><td >assembler doesn't properly process clobber,input and output register lists</td><td>atomic_intr_cond_try in atomic.h</td><td >Closed</td></tr>
109 <tr><td ><a href="http://llvm.org/bugs/show_bug.cgi?id=3822">3822</a></td><td >failed assertion with -O2</td><td>build of GENERIC with -O2</td><td >Fixed</td></tr>
110 <tr><td ><a href="http://llvm.org/bugs/show_bug.cgi?id=3853">3853</a></td><td >__thread keyword not supported</td><td>build of all userland base tools</td><td >Fixed</td></tr>
111 <tr><td ><a href="http://llvm.org/bugs/show_bug.cgi?id=4007">4007</a></td><td > clang doesn't know -Werror-foo is the same as -Werror=foo</td><td>barrage of warnings during make depend</td><td >Fixed</td></tr>
112 <tr><td ><a href="http://llvm.org/bugs/show_bug.cgi?id=4020">4020</a></td><td >clang doesn't allow zero-sized arrays</td><td>build of lib/libc</td><td >Closed (won't fix)</td></tr>
113 <tr><td ><a href="http://llvm.org/bugs/show_bug.cgi?id=4022">4022</a></td><td >incorrect handling of __inline</td><td>build of LINT</td><td >Closed</td></tr>
118 <h2>atomic_intr_cond_try</h2>
119 The long standing atomic_intr_cond_try issue has been solved in commit <a href="http://gitweb.dragonflybsd.org/dragonfly.git/commit/caae4d604234d17dff3080f60624a583965c2cf4">caae4d604234d17dff3080f60624a583965c2cf4</a>.
122 <h2>llvm/clang oddities</h2>
123 <h3>zero-size arrays</h3>
124 llvm/clang doesn't support zero sized arrays and automatically generates arrays with a size 1 when a zero-size array is specified.
126 <h3>__i386__ vs i386</h3>
127 NOTE: This issue has been fixed in <a href="http://llvm.org/viewvc/llvm-project?view=rev&revision=67378">this commit</a>.