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<p>Hi,</p>
<p>Many thanks for this advice. I'm just now getting back to this.
If I solve the libgcc_s problem, I'll let you know.</p>
<p>Thanks again,</p>
<p>Chris.<br>
</p>
<div class="moz-cite-prefix">On 2/19/20 4:02 PM, Richard Smith
wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAOfiQqkKwFgJhgKwUnJbuaD_joW9PUCyky2S+ZYxOcu4PKFT_g@mail.gmail.com">
<div dir="ltr">
<div dir="ltr">On Thu, 23 Jan 2020 at 07:24, Christopher H Green
via cfe-users <<a href="mailto:cfe-users@lists.llvm.org" moz-do-not-send="true">cfe-users@lists.llvm.org</a>>
wrote:<br>
</div>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
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<p>Hi,</p>
<p>I've spent the last several days trying to build a
fast, full-featured relocatable distribution of
LLVM/Clang 9.0.1 on Linux RHEL7, which has an older
native GCC (4.8.5)—I can't require the RH toolset. I
have access to a modern version of GCC in order to make
the stage-1 build, but I need the final product not only
to be relocatable, but also to be free of any dependence
on that GCC or its libraries. In other words, I want to
be able to distribute an LLVM/CLang which defaults to
compiling using libc++, libcxxabi, compiler-rt,
libunwind, and ldd, and which itself depends neither on
libstdc++ or libgcc_s. I'd also like to be able to to
provide LTO, but whether the compiler is itself the
beneficiary of LTO is optional. As a final wish, I'd
like the distribution as installed to serve as an SDK
against which to build other components such as
separately packaged lldb and f18. Oh, and I want a pony.</p>
<p>Here's what I have so far (CMake cache files attached
for stages 1 and 2). Invoked in a separate build
directory with:</p>
<pre>env CC=gcc-9 CXX=g++-9 \
'CXXFLAGS=-Wno-cast-function-type -Wno-deprecated-copy -Wno-init-list-lifetime -Wno-pessimizing-move -Wno-redundant-move -Wno-uninitialized -Wno-unused-function -Wno-unused-variable' \
cmake -GNinja -C FNAL.cmake -DCMAKE_INSTALL_PREFIX=<install-path> \
-DBOOTSTRAP_LLVM_CXX_STD=c++17 <src-path>
ninja
ninja install
</pre>
<p>(The <tt>CXXFLAGS</tt> are just to keep the noise down
during the stage-1 build).<br>
</p>
<p>I appear (finally) to have a mostly functioning build <i>in
situ</i>, but the installed compiler depends upon
libstdc++ to be able to run, and I should have put
<tt>--rtlib=compiler-rt</tt> in <tt>LINKER_FLAGS</tt>
rather than <tt>CXX_FLAGS</tt>. Additionally, I haven't
been able to come up with a good set of targets for
<tt>LLVM_DISTRIBUTION_COMPONENTS</tt>, but when I do I
think I need to exclude static libraries if I'm doing
LTO, no?<br>
</p>
<p>I suspect I need a three stage build—well, two stage
2s, at least—but any advice would be appreciated as I'm
wandering around in the dark at this point.
<br>
</p>
</div>
</blockquote>
<div>I have a two-stage setup that builds a GCC-free Clang
except for libgcc_s (I've not looked at what's pulling that
in yet, but I expect that's resolvable).<br>
</div>
<div><br>
</div>
<div>My stage1 cmake setup
has: -DCLANG_DEFAULT_CXX_STDLIB=libc++
-DCLANG_DEFAULT_RTLIB=compiler-rt</div>
<div>My stage2 cmake setup additionally
has: -DLIBCXXABI_USE_LLVM_UNWINDER=ON
-DLIBCXXABI_USE_COMPILER_RT=ON -DLIBCXX_USE_COMPILER_RT=ON</div>
<div>(and points CMAKE_C_COMPILER and CMAKE_CXX_COMPILER at
the stage1 clang).</div>
<div><br>
</div>
<div>There might be some other things you need, I'm not sure.
But it should be doable in two stages.</div>
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<p>
</p>
<p>Many thanks for any help,</p>
<p>Chris.</p>
<p><br>
</p>
</div>
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