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<p class="MsoNormal">I think that the immediate problem is that step 5) for the out-of-tree build should end in “..” rather than “../lib”.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Pete<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> a sk <sacodework@gmail.com> <br>
<b>Sent:</b> Thursday, December 23, 2021 9:14 AM<br>
<b>To:</b> Peter Steinfeld <psteinfeld@nvidia.com><br>
<b>Cc:</b> flang-dev on LLVM <flang-dev@lists.llvm.org><br>
<b>Subject:</b> Re: [flang-dev] Unknown CMake command "add_flang_library" error<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">External email: Use caution opening links or attachments</span></b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">
</span><o:p></o:p></p>
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<p class="MsoNormal">Thanks Peter.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I would like to share how I am building flang using README.md document given in llvm-project/flang.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Before building flang in debug mode, I had built clang, mlir , llvm in release mode by using README.md documentation given in llvm-project.<o:p></o:p></p>
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<p class="MsoNormal">The steps I have used to build clang,mlir,llvm in release mode are given below:<o:p></o:p></p>
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<p class="MsoNormal">1) <code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">git clone
<a href="https://github.com/llvm/llvm-project.git"><span style="color:navy">https://github.com/llvm/llvm-project.git</span></a></span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">2) cd llvm-project</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">3) mkdir build</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">4) cd build</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">5)
</span></code><code><span style="font-size:10.0pt">cmake ../llvm -G Ninja -DLLVM_ENABLE_PROJECTS="clang;mlir" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/home/llvm-project/build
</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">6) ninja</span></code><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">It is working and after completion of build process of clang and mlir, I started out of tree debug build process for flang.</span></code><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">for this build process I followed the README.md document in flang github repository.</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">Steps are:</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">1) cd llvm-project</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">2) cd flang</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">3) mkdir build</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">4) cd build</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">5) cmake -DLLVM_DIR=/home/llvm-project/build/lib/cmake/llvm -DCLANG_DIR=/home/llvm-project/build/lib/cmake/clang -DMLIR_DIR=/home/llvm-project/build/lib/cmake/mlir ../lib</span></code><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">after running cmake , There is a error related to add_flang_library which was shared in previous email.</span></code><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><code><b><span style="font-size:10.0pt"> CMake Error at Common/CMakeLists.txt:2 (add_flang_library):</span></b></code><b><span style="font-size:10.0pt;font-family:"Courier New""><br>
<code> Unknown CMake command "add_flang_library".</code></span></b><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">I followed the steps according to README.md document.</span></code><o:p></o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">Please guide according to the information given in github repo.</span></code><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">Is there any issue with the steps which I have used from github repo?</span></code><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><code><span style="font-size:10.0pt">Thanks and Regards</span></code><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, 22 Dec 2021 at 03:14, Peter Steinfeld <<a href="mailto:psteinfeld@nvidia.com">psteinfeld@nvidia.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I'm not sure what's causing your specific error message, but I notice that you're not doing an out-of-tree build the same way that I do. After doing the full, in-tree build, I
also create an install area using the command "make install" (actually, for me, "ninja install") to create the mlir and clang libraries and include files on which the out-of-tree build depends. I first "cd" to the build directory that contains the full, in-tree
build, and then execute "make install". This creates and populates a directory called "install" parallel to the directory called "build".<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Wackily, in order to pick up the Google test related files, the out-of-tree build depends on the build area for the llvm files.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">After creating the build and install areas for my full, in-tree build (called "base" below), I create a source directory that contains all of the flang (and llvm, clang, and mlir)
source. I then "cd" to the directory above the "flang" directory and execute a script that looks like the commands below. Note that the directories for mlir and clang come from the install area and the directories from llvm come from the build area.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#!/bin/bash<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">checkStatus() {<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> if [ $? -ne 0 ]<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> then<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> echo Exit $wd with error $?: $1<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> exit 127<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> fi<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">}<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">INSTALLDIR=`pwd`/install<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">rm -rf build<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">rm -rf install<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">mkdir -p build<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">checkStatus "mkdir -p build"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">date<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">hostname<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">cd build<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">cmake \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -G Ninja \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> ../llvm \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DCMAKE_BUILD_TYPE=Release \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DLLVM_LIT_ARGS=-v \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DFLANG_ENABLE_WERROR=On \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DCMAKE_CXX_STANDARD=17 \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DLLVM_ENABLE_PROJECTS="clang;mlir;flang;compiler-rt" \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DLLVM_BUILD_TOOLS=On \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DLLVM_INSTALL_UTILS=On \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DLLVM_TARGETS_TO_BUILD=host \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DLLVM_ENABLE_ASSERTIONS=ON \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DCMAKE_CXX_LINK_FLAGS="-Wl,-rpath,$LD_LIBRARY_PATH" \<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> -DCMAKE_INSTALL_PREFIX=$INSTALLDIR<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">checkStatus "cmake"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">ninja<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">checkStatus "ninja"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">ninja install<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">checkStatus "ninja install"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>From:</b> flang-dev <<a href="mailto:flang-dev-bounces@lists.llvm.org" target="_blank">flang-dev-bounces@lists.llvm.org</a>>
<b>On Behalf Of </b>a sk via flang-dev<br>
<b>Sent:</b> Tuesday, December 21, 2021 9:07 AM<br>
<b>To:</b> <a href="mailto:flang-dev@lists.llvm.org" target="_blank">flang-dev@lists.llvm.org</a><br>
<b>Subject:</b> [flang-dev] Unknown CMake command "add_flang_library" error<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">External email: Use caution opening links or attachments</span></b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">
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<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">Hi Community,</span><o:p></o:p></p>
<p style="margin-bottom:0in"> <o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">I am building Flang out of tree but getting error related to add_flang_library i.e.
</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">-------------------------------------------------------------------------------------------------------</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">Make Warning (dev) in CMakeLists.txt:</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">No project() command is present. The top-level CMakeLists.txt file must</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">contain a literal, direct call to the project() command. Add a line of</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">code such as</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">project(ProjectName)</span>
<o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">near the top of the file, but after cmake_minimum_required().</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">CMake is pretending there is a "project(Project)" command on the first</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">line.</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">This warning is for project developers. Use -Wno-dev to suppress it.</span><o:p></o:p></p>
<p style="margin-bottom:0in"><b><span style="font-family:"Arial",sans-serif">CMake Error at Common/CMakeLists.txt:2 (add_flang_library):</span></b><o:p></o:p></p>
<p style="margin-bottom:0in"><b><span style="font-family:"Arial",sans-serif">Unknown CMake command "add_flang_library".</span></b><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">CMake Warning (dev) in CMakeLists.txt:</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">No cmake_minimum_required command is present. A line of code such as</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">cmake_minimum_required(VERSION 3.16)</span>
<o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">should be added at the top of the file. The version specified may be lower</span>
<o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">if you wish to support older CMake versions for this project. For more</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">information run "cmake --help-policy CMP0000".</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">This warning is for project developers. Use -Wno-dev to suppress it.</span><o:p></o:p></p>
<p style="margin-bottom:0in"><span style="font-family:"Arial",sans-serif">-- Configuring incomplete, errors occurred!</span><o:p></o:p></p>
<p style="margin-bottom:0in">-------------------------------------------------------------------------------------------------------<o:p></o:p></p>
<p style="margin-bottom:0in"> <o:p></o:p></p>
<p style="margin-bottom:0in"><b><span style="font-family:"Arial",sans-serif">Command used for building Flang :
</span></b><code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">cmake -DLLVM_DIR=llvm-project/build/lib/cmake/llvm -DCLANG_DIR=llvm-project/build/lib/cmake/clang -DMLIR_DIR=llvm-project/build/lib/cmake/mlir -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=llvm-project/flang/build
../lib</span></code><o:p></o:p></p>
<p style="margin-bottom:0in"><code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Clang, mlir and llvm were built in release mode before building Flang.</span></code><o:p></o:p></p>
<p style="margin-bottom:0in"><code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Please guide.</span></code>
<o:p></o:p></p>
<p style="margin-bottom:0in"><code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Thanks</span></code><o:p></o:p></p>
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