build on macOS Monterey fails with error Unknown CMake command "__cxx_std_process"

[dg1sbg]

❯ git clone https://github.com/rpav/c2ffi.git
Cloning into 'c2ffi'...
remote: Enumerating objects: 1487, done.
remote: Counting objects: 100% (220/220), done.
remote: Compressing objects: 100% (115/115), done.
remote: Total 1487 (delta 122), reused 179 (delta 100), pack-reused 1267
Receiving objects: 100% (1487/1487), 348.87 KiB | 3.92 MiB/s, done.
Resolving deltas: 100% (980/980), done.
❯ cd c2ffi
❯ export CPPFLAGS="-I/opt/homebrew/opt/llvm@12/include"
❯ export LDFLAGS="-L/opt/homebrew/opt/llvm@12/lib"
❯ export PATH="/opt/homebrew/opt/llvm@12/bin:$PATH"
❯ mkdir build
❯ cd build
❯ cmake ..
-- Config: -Release
-- The C compiler identification is AppleClang 13.0.0.13000029
-- The CXX compiler identification is AppleClang 13.0.0.13000029
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- CXX Compiler: AppleClang
-- Building for Linux-x64
-- Found ZLIB: /Library/Developer/CommandLineTools/SDKs/MacOSX12.1.sdk/usr/lib/libz.tbd (found version "1.2.11")
-- Found LibXml2: /Library/Developer/CommandLineTools/SDKs/MacOSX12.1.sdk/usr/lib/libxml2.tbd (found version "2.9.4")
-- Found LLVM 12.0.1
-- LLVM installed in /opt/homebrew/opt/llvm@12
-- Using LLVMConfig.cmake in: /opt/homebrew/opt/llvm@12/lib/cmake/llvm
CMake Error at CMake/cxx_features.cmake:102 (__cxx_std_process):
Unknown CMake command "__cxx_std_process".
Call Stack (most recent call first):
CMakeLists.txt:63 (target_cxx_std)

-- Configuring incomplete, errors occurred!
See also "/Users/goenninger/swdev/c2ffi/build/CMakeFiles/CMakeOutput.log".
See also "/Users/goenninger/swdev/c2ffi/build/CMakeFiles/CMakeError.log".
❯ cmake --version
cmake version 3.22.2

I noticed that it assumes building for "Linux-x64" - is that correct?
I also see (running "make"):
-- The C compiler identification is AppleClang 13.0.0.13000029
-- The CXX compiler identification is AppleClang 13.0.0.13000029
Which certainly is not correct.

I also tried issue #100 but no luck ...

Any help really appeciated! - Thanks

frgo

[paines]

it compiles with these commands (even with M1):

git clone https://github.com/rpav/c2ffi.git
cd c2ffi
export CPPFLAGS="-I/opt/homebrew/opt/llvm@12/include"
export LDFLAGS="-L/opt/homebrew/opt/llvm@12/lib"
export PATH="/opt/homebrew/opt/llvm@12/bin:$PATH"
mkdir build
cd build
LLVM_DIR=/opt/homebrew/Cellar/llvm@12/12.0.1_1/lib/cmake/llvm CC="clang" CXX="clang++" cmake ..
make
make install

[Paxa]

I applied changes from #83 and it works

in CMake/cxx_features.cmake change

if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
# to
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")

[cneira]

I applied changes from #83 and it works

in CMake/cxx_features.cmake change

if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
# to
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")

I just tried today and that worked thanks!

[jcguu95]

Thanks for all of the help above. I'm on Monterey version 12.5. What just worked for the step cmake is the following:

1. Obtain the git repo and switch to a build directory.

$ git clone https://github.com/rpav/c2ffi.git
$ cd c2ffi
$ make build
$ cd build

2. In CMake/cxx_features.cmake, change

if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")

to

if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")

3. Locate llvm and cmake.

$ whereis cmake
cmake: /opt/homebrew/bin/cmake
$ find /opt/homebrew/ -type d -name llvm
find: /opt/homebrew//var/run/nginx/scgi_temp: Permission denied
find: /opt/homebrew//var/run/nginx/uwsgi_temp: Permission denied
find: /opt/homebrew//var/run/nginx/proxy_temp: Permission denied
find: /opt/homebrew//var/run/nginx/fastcgi_temp: Permission denied
find: /opt/homebrew//var/run/nginx/client_body_temp: Permission denied
/opt/homebrew//Cellar/llvm
/opt/homebrew//Cellar/llvm/16.0.0/include/llvm
/opt/homebrew//Cellar/llvm/16.0.0/include/clang-tidy/llvm
/opt/homebrew//Cellar/llvm/16.0.0/lib/cmake/llvm
/opt/homebrew//Cellar/llvm/16.0.0/lib/python3.11/site-packages/llvm
/opt/homebrew//Cellar/llvm/16.0.0/share/emacs/site-lisp/llvm

4. In CMakeLists.txt, change version to 16.0.0.

find_package(LLVM 16.0.0 CONFIG)

$ export CPPFLAGS="-I/opt/homebrew/Cellar/llvm/16.0.0/include"
$ export LDFLAGS="-L/opt/homebrew/Cellar/llvm/16.0.0/lib"
$ export PATH="/opt/homebrew/Cellar/llvm/16.0.0/bin:$PATH"
$ LLVM_DIR=/opt/homebrew/Cellar/llvm/16.0.0/lib/cmake/llvm CC="clang" CXX="clang++" cmake ..

However, in the next step make, I encountered two errors

/tmp/c2ffi/src/AST.cpp:277:35: error: no member named 'isAscii' in 'clang::StringLiteral'
                            if(s->isAscii() || s->isUTF8()) {
                               ~  ^
/tmp/c2ffi/src/AST.cpp:284:33: error: call to 'convertUTF32ToUTF8String' is ambiguous
                                convertUTF32ToUTF8String(llvm::ArrayRef<char>(bytes.data(), bytes.size()), value);
                                ^~~~~~~~~~~~~~~~~~~~~~~~