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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compiler ToT on Ubuntu 17.10 results in error"
href="https://bugs.llvm.org/show_bug.cgi?id=36317">36317</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Compiler ToT on Ubuntu 17.10 results in error
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>santosh.zanjurne@amd.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Building compiler sources on Ubuntu 17.10 with default gcc version 7.2.0
results in following build error, when the sources are build with flag
-DLLVM_ENABLE_WERROR=ON.
[ 0%] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/Process.cpp.o
cd /home/amd/santosh/llvm/trunk/build/lib/Support && /usr/bin/c++
-DGTEST_HAS_RTTI=0 -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS
-D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-I/home/amd/santosh/llvm/trunk/build/lib/Support
-I/home/amd/santosh/llvm/trunk/llvm/lib/Support -I/usr/include/libxml2
-I/home/amd/santosh/llvm/trunk/build/include
-I/home/amd/santosh/llvm/trunk/llvm/include -fPIC -fvisibility-inlines-hidden
-Werror -Werror=date-time -std=c++11 -Wall -W -Wno-unused-parameter
-Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic
-Wno-long-long -Wno-maybe-uninitialized -Wdelete-non-virtual-dtor -Wno-comment
-ffunction-sections -fdata-sections -O3 -UNDEBUG -fno-exceptions -fno-rtti
-o CMakeFiles/LLVMSupport.dir/Process.cpp.o -c
/home/amd/santosh/llvm/trunk/llvm/lib/Support/Process.cpp
In file included from
/home/amd/santosh/llvm/trunk/llvm/lib/Support/Unix/Unix.h:24:0,
from
/home/amd/santosh/llvm/trunk/llvm/lib/Support/Unix/Process.inc:14,
from
/home/amd/santosh/llvm/trunk/llvm/lib/Support/Process.cpp:94:
/home/amd/santosh/llvm/trunk/llvm/include/llvm/Support/Errno.h:34:13: error:
mangled name for ‘decltype (F(llvm::sys::RetryAfterSignal::As ...))
llvm::sys::RetryAfterSignal(const FailT&, const Fun&, const Args& ...) [with
FailT = int; Fun = int(int, stat*) throw (); Args = {int, stat*}]’ will change
in C++17 because the exception specification is part of a function type
[-Werror=noexcept-type]
inline auto RetryAfterSignal(const FailT &Fail, const Fun &F,
^~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
The code that results in an error is "decltype", from
include/llvm/Support/Errno.h,
template <typename FailT, typename Fun, typename... Args>
inline auto RetryAfterSignal(const FailT &Fail, const Fun &F, const Args &...
As) -> decltype(F(As...)) {
decltype(F(As...)) Res;
do
Res = F(As...);
while (Res == Fail && errno == EINTR);
return Res;
}</pre>
</div>
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