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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __clear_cache builtin is not disable with -fno-builtins on ARM"
href="http://llvm.org/bugs/show_bug.cgi?id=16915">16915</a>
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<th>Summary</th>
<td>__clear_cache builtin is not disable with -fno-builtins on ARM
</td>
</tr>
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<th>Product</th>
<td>compiler-rt
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>compiler-rt
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>s_llvm@nedprod.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This is a slightly difficult bug to explain without being able to supply
source. Still, I'll try.
I've added a new compiler-rt build target which looks like this:
Configs += full-arm asan-arm
Arch.full-arm := arm
Arch.asan-arm := arm
CFLAGS.full-arm = $(CFLAGS) -target armv7-unknown-nto-qnx8.0.0eabi -fno-builtin
-fno-rtti
CFLAGS.asan-arm := $(CFLAGS) -fPIE -fno-builtin -fno-rtti \
-target armv7-unknown-nto-qnx8.0.0eabi --sysroot=$(QNX_TARGET) -mllvm
-arm-enable-ehabi
FUNCTIONS.full-arm := $(CommonFunctions) $(ArchFunctions.arm)
FUNCTIONS.asan-arm := $(AsanFunctions) $(InterceptionFunctions) \
$(SanitizerCommonFunctions)
So, in other words, I've created a full support library for ARM, and it gets
compiled with -fno-builtin because I'm compiling hard editions of the builtins.
The problem is that trying to compile __clear_cache from lib/clear_cache.c
still errors because I'm trying to reimplement a builtin. I think this is
because the ARM target isn't correctly disabling __clear_cache when
-fno-builtins is specified, and that would be a bug.
To work around it I simply renamed lib/clear_cache.c to
lib/clear_cache.c.disabled and all now works, albeit minus a __clear_cache
implementation in the libclang_rt-full-arm.a.
Niall</pre>
</div>
</p>
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