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<p class="MsoNormal">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"><o:p> </o:p></p>
<p class="MsoNormal">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"><o:p> </o:p></p>
<p class="MsoNormal">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"><o:p> </o:p></p>
<p class="MsoNormal">#!/bin/bash<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">checkStatus() {<o:p></o:p></p>
<p class="MsoNormal"> if [ $? -ne 0 ]<o:p></o:p></p>
<p class="MsoNormal"> then<o:p></o:p></p>
<p class="MsoNormal"> echo Exit $wd with error $?: $1<o:p></o:p></p>
<p class="MsoNormal"> exit 127<o:p></o:p></p>
<p class="MsoNormal"> fi<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">INSTALLDIR=`pwd`/install<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">rm -rf build<o:p></o:p></p>
<p class="MsoNormal">rm -rf install<o:p></o:p></p>
<p class="MsoNormal">mkdir -p build<o:p></o:p></p>
<p class="MsoNormal">checkStatus "mkdir -p build"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">date<o:p></o:p></p>
<p class="MsoNormal">hostname<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">cd build<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">cmake \<o:p></o:p></p>
<p class="MsoNormal"> -G Ninja \<o:p></o:p></p>
<p class="MsoNormal"> ../llvm \<o:p></o:p></p>
<p class="MsoNormal"> -DCMAKE_BUILD_TYPE=Release \<o:p></o:p></p>
<p class="MsoNormal"> -DLLVM_LIT_ARGS=-v \<o:p></o:p></p>
<p class="MsoNormal"> -DFLANG_ENABLE_WERROR=On \<o:p></o:p></p>
<p class="MsoNormal"> -DCMAKE_CXX_STANDARD=17 \<o:p></o:p></p>
<p class="MsoNormal"> -DLLVM_ENABLE_PROJECTS="clang;mlir;flang;compiler-rt" \<o:p></o:p></p>
<p class="MsoNormal"> -DLLVM_BUILD_TOOLS=On \<o:p></o:p></p>
<p class="MsoNormal"> -DLLVM_INSTALL_UTILS=On \<o:p></o:p></p>
<p class="MsoNormal"> -DLLVM_TARGETS_TO_BUILD=host \<o:p></o:p></p>
<p class="MsoNormal"> -DLLVM_ENABLE_ASSERTIONS=ON \<o:p></o:p></p>
<p class="MsoNormal"> -DCMAKE_CXX_LINK_FLAGS="-Wl,-rpath,$LD_LIBRARY_PATH" \<o:p></o:p></p>
<p class="MsoNormal"> -DCMAKE_INSTALL_PREFIX=$INSTALLDIR<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">checkStatus "cmake"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ninja<o:p></o:p></p>
<p class="MsoNormal">checkStatus "ninja"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ninja install<o:p></o:p></p>
<p class="MsoNormal">checkStatus "ninja install"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> flang-dev <flang-dev-bounces@lists.llvm.org> <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> flang-dev@lists.llvm.org<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"><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"><o:p> </o:p></p>
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<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">Hi Community,</span><o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<o:p> </o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">-------------------------------------------------------------------------------------------------------</span><o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">Make Warning (dev) in CMakeLists.txt:</span><o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">code such as</span><o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">project(ProjectName)</span> <o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">line.</span><o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">CMake Warning (dev) in CMakeLists.txt:</span><o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">cmake_minimum_required(VERSION 3.16)</span>
<o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">information run "cmake --help-policy CMP0000".</span><o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<span style="font-family:"Arial",sans-serif">-- Configuring incomplete, errors occurred!</span><o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
-------------------------------------------------------------------------------------------------------<o:p></o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<o:p> </o:p></p>
<p style="margin-bottom:0in;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<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;background-attachment:scroll;background-position-x:0%;background-position-y:0%">
<code><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Thanks</span></code><o:p></o:p></p>
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