# Install on mac os fails - The C++ compiler cannot find a working standard library and it is not li

**URL:** <https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534>\
**Category:** User discussions\
**Tags:** installation-error\
**Created:** [January 7, 2023, 6:54am UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534 "2023-01-07T06:54:03Z")\
**Posts on this page:** 9\
**Page:** 1

<div class="post-metadata">

**Author:** ![geoffwoollard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/geoffwoollard/32/1903_2.png) [@geoffwoollard](https://gromacs.bioexcel.eu/u/geoffwoollard)\
**Post date:** [January 7, 2023, 6:54am UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/1 "2023-01-07T06:54:03Z")

</div>

GROMACS version: gromacs-2022.4  
GROMACS modification: No

I am following the quick and dirty install guidelines at [https://manual.gromacs.org/documentation/current/install-guide/index.html](https://manual.gromacs.org/documentation/current/install-guide/index.html).

`cmake` is failing, see below. I also tried with different combinations of `-DCMAKE_C_COMPILER` and `-DCMAKE_CXX_COMPILER` set to clang/clang++.

I don’t really understand how to resolve the error `The C++ compiler cannot find a working standard library and it is not libstdc++.`

```bash
(base) gws-MacBook-Pro-6:build gw$ cmake .. -DGMX_BUILD_OWN_FFTW=ON -DREGRESSIONTEST_DOWNLOAD=OFF -DCMAKE_C_COMPILER=gcc -DGMX_GPLUSPLUS_PATH=g++ -DCMAKE_CXX_COMPILER=g++
-- The C compiler identification is AppleClang 10.0.0.10001145
-- The CXX compiler identification is AppleClang 10.0.0.10001145
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/gcc - 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: /usr/bin/g++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CXX17_COMPILES
-- Performing Test CXX17_COMPILES - Failed
-- Performing Test USING_LIBSTDCXX
-- Performing Test USING_LIBSTDCXX - Failed
CMake Error at cmake/FindLibStdCpp.cmake:81 (message):
  The C++ compiler cannot find a working standard library and it is not
  libstdc++. The GROMACS build cannot handle this case. Please use a
  working C++17 compiler and standard library.
Call Stack (most recent call first):
  CMakeLists.txt:68 (find_package)

-- Configuring incomplete, errors occurred!
See also "/Users/gw/software/gromacs-2022.4/build/CMakeFiles/CMakeOutput.log".
See also "/Users/gw/software/gromacs-2022.4/build/CMakeFiles/CMakeError.log".

```

---

<div class="post-metadata">

**Author:** ![geoffwoollard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/geoffwoollard/32/1903_2.png) [@geoffwoollard](https://gromacs.bioexcel.eu/u/geoffwoollard)\
**Post date:** [January 7, 2023, 6:57am UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/2 "2023-01-07T06:57:26Z")

</div>

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Compiler: /usr/bin/gcc
Build flags:
Id flags:

The output was:
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Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"

The C compiler identification is AppleClang, found in "/Users/gw/software/gromacs-2022.4/build/CMakeFiles/3.24.20220817-gb6cfa38/CompilerIdC/a.out"

Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded.
Compiler: /usr/bin/g++
Build flags:
Id flags:

The output was:
0

Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"

The CXX compiler identification is AppleClang, found in "/Users/gw/software/gromacs-2022.4/build/CMakeFiles/3.24.20220817-gb6cfa38/CompilerIdCXX/a.out"

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Found CUDA installation: /usr/local/cuda, version unknown
clang: warning: -Wl,-v: 'linker' input unused [-Wunused-command-line-argument]
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```bash
(base) gws-MacBook-Pro-6:build gw$ cat /Users/gw/software/gromacs-2022.4/build/CMakeFiles/CMakeError.log
Performing C++ SOURCE FILE Test CXX17_COMPILES failed with the following output:
Change Dir: /Users/gw/software/gromacs-2022.4/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_b3567/fast && /Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/cmTC_b3567.dir/build.make CMakeFiles/cmTC_b3567.dir/build
Building CXX object CMakeFiles/cmTC_b3567.dir/src.cxx.o
/usr/bin/g++ -DCXX17_COMPILES -std=c++17 -MD -MT CMakeFiles/cmTC_b3567.dir/src.cxx.o -MF CMakeFiles/cmTC_b3567.dir/src.cxx.o.d -o CMakeFiles/cmTC_b3567.dir/src.cxx.o -c /Users/gw/software/gromacs-2022.4/build/CMakeFiles/CMakeTmp/src.cxx
/Users/gw/software/gromacs-2022.4/build/CMakeFiles/CMakeTmp/src.cxx:7:31: error: call to unavailable member function 'value': introduced in macOS 10.14
  std::string_view view(input.value());
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/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/optional:933:33: note: candidate function has been explicitly made unavailable
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/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/optional:951:28: note: candidate function not viable: no known conversion from 'optional<...>' to 'optional<...>' for object argument
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```

---

<div class="post-metadata">

**Author:** ![geoffwoollard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/geoffwoollard/32/1903_2.png) [@geoffwoollard](https://gromacs.bioexcel.eu/u/geoffwoollard)\
**Post date:** [January 7, 2023, 6:58am UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/3 "2023-01-07T06:58:53Z")

</div>

```bash
(base) gws-MacBook-Pro-6:build gw$ gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 10.0.0 (clang-1000.11.45.5)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

(base) gws-MacBook-Pro-6:build gw$ g++ --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 10.0.0 (clang-1000.11.45.5)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

(base) gws-MacBook-Pro-6:build gw$ clang --version
Apple LLVM version 10.0.0 (clang-1000.11.45.5)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

(base) gws-MacBook-Pro-6:build gw$ clang++ --version
Apple LLVM version 10.0.0 (clang-1000.11.45.5)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

```

---

<div class="post-metadata">

**Author:** ![pbauer](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pbauer/32/13_2.png) [@pbauer](https://gromacs.bioexcel.eu/u/pbauer)\
**Post date:** [January 7, 2023, 8:17am UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/4 "2023-01-07T08:17:20Z")

</div>

Hello,

Can you please try compiling with the libc++ from clang instead? It looks like whatever MacOS is providing as g++ doesn’t work :)

As a note, I’ve been compiling this version of GROMACS on my Mac for months now without issue, so I hope this is just the default Mac clang being confused.

Cheers

Paul

---

<div class="post-metadata">

**Author:** ![geoffwoollard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/geoffwoollard/32/1903_2.png) [@geoffwoollard](https://gromacs.bioexcel.eu/u/geoffwoollard)\
**Post date:** [January 7, 2023, 8:46am UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/5 "2023-01-07T08:46:40Z")

</div>

> [@pbauer](#):
>
> Can you please try compiling with the libc++ from clang instead?

How exactly do I do that? I googled “libc++ from apple clang” and read 5 links, but couldn’t figure it out.

1. How do I find the path for the libc++ from clang?
2. Once I have that path do I use it with the flag `-DCMAKE_CXX_FLAGS` ?

---

<div class="post-metadata">

**Author:** ![geoffwoollard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/geoffwoollard/32/1903_2.png) [@geoffwoollard](https://gromacs.bioexcel.eu/u/geoffwoollard)\
**Post date:** [January 7, 2023, 8:53am UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/6 "2023-01-07T08:53:00Z")

</div>

Using the flags `-DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ \ -DCMAKE_CXX_FLAGS=-stdlib=libc++` isn’t working

```auto
(base) gws-MacBook-Pro-6:build gw$ cmake .. -DGMX_BUILD_OWN_FFTW=ON -DREGRESSIONTEST_DOWNLOAD=OFF -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_FLAGS=-stdlib=libc++
-- The C compiler identification is AppleClang 10.0.0.10001145
-- The CXX compiler identification is AppleClang 10.0.0.10001145
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/clang - 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: /usr/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CXX17_COMPILES
-- Performing Test CXX17_COMPILES - Failed
-- Performing Test USING_LIBSTDCXX
-- Performing Test USING_LIBSTDCXX - Failed
CMake Error at cmake/FindLibStdCpp.cmake:81 (message):
  The C++ compiler cannot find a working standard library and it is not
  libstdc++. The GROMACS build cannot handle this case. Please use a
  working C++17 compiler and standard library.
Call Stack (most recent call first):
  CMakeLists.txt:68 (find_package)

-- Configuring incomplete, errors occurred!
See also "/Users/gw/software/gromacs-2022.4/build/CMakeFiles/CMakeOutput.log".
See also "/Users/gw/software/gromacs-2022.4/build/CMakeFiles/CMakeError.log".

```

---

<div class="post-metadata">

**Author:** ![geoffwoollard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/geoffwoollard/32/1903_2.png) [@geoffwoollard](https://gromacs.bioexcel.eu/u/geoffwoollard)\
**Post date:** [January 7, 2023, 9:00am UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/7 "2023-01-07T09:00:36Z")

</div>

Also, if it helps

```bash
(base) gws-MacBook-Pro-6:developer gw$ clang++ test.cpp -o test.out -stdlib=libc++ # works fine
(base) gws-MacBook-Pro-6:developer gw$ clang++ test.cpp -o test.out -stdlib=libstdc++
clang: warning: libstdc++ is deprecated; move to libc++ [-Wdeprecated]

```

---

<div class="post-metadata">

**Author:** ![pbauer](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pbauer/32/13_2.png) [@pbauer](https://gromacs.bioexcel.eu/u/pbauer)\
**Post date:** [January 7, 2023, 12:21pm UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/8 "2023-01-07T12:21:18Z")

</div>

Hello,

you should just need to add -stdlib=libc++ to -DCMAKE\_CXX\_FLAGS, but  
there must be a deeper issue with your compiler setup.

I just tried building release-2022.4 the same way as you did initially  
and didn’t have any issues. But I’m using Homebrew on the Mac, so that  
might affect things.

Cheers

Paul

---

<div class="post-metadata">

**Author:** ![geoffwoollard](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/geoffwoollard/32/1903_2.png) [@geoffwoollard](https://gromacs.bioexcel.eu/u/geoffwoollard)\
**Post date:** [January 8, 2023, 9:35pm UTC](https://gromacs.bioexcel.eu/t/install-on-mac-os-fails-the-c-compiler-cannot-find-a-working-standard-library-and-it-is-not-li/5534/9 "2023-01-08T21:35:39Z")

</div>

So any suggestions for trouble shooting the error message I’m getting with adding -stdlib=libc++ to -DCMAKE\_CXX\_FLAGS ?