[BUG]: macos build error : 'cstdint' file not found

[lorentzenchr]

Problem description

I tried to create my first extension. My setup is:

• OS: macos 15.0.1 (sequoia)
• CPU: Intel i7-8559U
• cmake version 3.30.0
• virtual environment with pip install nanobind

Reproducible example code

Files

CMakeList.txt

cmake_minimum_required(VERSION 3.15...3.27)
project(my_project) # Replace 'my_project' with the name of your project

if (CMAKE_VERSION VERSION_LESS 3.18)
  set(DEV_MODULE Development)
else()
  set(DEV_MODULE Development.Module)
endif()

find_package(Python 3.8 COMPONENTS Interpreter ${DEV_MODULE} REQUIRED)

if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
endif()

# Detect the installed nanobind package and import it into CMake
execute_process(
  COMMAND "${Python_EXECUTABLE}" -m nanobind --cmake_dir
  OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE nanobind_ROOT)
find_package(nanobind CONFIG REQUIRED)

nanobind_add_module(my_ext my_ext.cpp)

my_ext.cpp

#include <nanobind/nanobind.h>

int add(int a, int b) { return a + b; }

NB_MODULE(my_ext, m) {
    m.def("add", &add);
}

Commands

1. cmake -S . -B build

   -- The C compiler identification is AppleClang 16.0.0.16000026
   -- The CXX compiler identification is AppleClang 16.0.0.16000026
   -- 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
   -- Found Python: /Users/lorentzen/github/python3_general/bin/python3.12 (found suitable version "3.12.4", minimum required is "3.8") found components: Interpreter Development.Module
   -- Configuring done (1.6s)
   -- Generating done (0.0s)
   -- Build files have been written to: /Users/lorentzen/github/test_nanobind/build
   

2. cmake --build build

   [  7%] Building CXX object CMakeFiles/nanobind-static.dir/Users/lorentzen/github/python3_general/lib/python3.12/site-packages/nanobind/src/nb_internals.cpp.o
   In file included from /Users/lorentzen/github/python3_general/lib/python3.12/site-packages/nanobind/src/nb_internals.cpp:10:
   /Users/lorentzen/github/python3_general/lib/python3.12/site-packages/nanobind/include/nanobind/nanobind.h:30:10: fatal error: 'cstdint' file not found
      30 | #include <cstdint>
         |          ^~~~~~~~~
   1 error generated.
   make[2]: *** [CMakeFiles/nanobind-static.dir/Users/lorentzen/github/python3_general/lib/python3.12/site-packages/nanobind/src/nb_internals.cpp.o] Error 1
   make[1]: *** [CMakeFiles/nanobind-static.dir/all] Error 2
   make: *** [all] Error 2
   

[wojdyr]

<cstdint> is a header from the C++ standard library. It seems that your compiler is not setup correctly.
Can it compile any C++ code that uses the standard library?

[lorentzenchr]

I removed and reinstalled Xcode. Now it works as expected.