I have a 16inch MacBook pro with latest updates (macOS Catalina 10.15.2 (19C57)), the latest version of XCode and Command line tools for macOS (the tools being installed in the usual path /Library/Developer/CommandLineTools/).. Not sure if this is relevant to my issue or not, but I also have the latest version of JetBrains’s CLion installed on my machine (running without issues).
Here is the problem: When trying to build a project with cmake, the build FAILS, giving me this error message:
In file included from /Users/basavyr/Pipeline/DevWorkspace/Github/xrootd/bindings/python/src/PyXRootDFile.cc:25:
In file included from /Users/basavyr/Pipeline/DevWorkspace/Github/xrootd/bindings/python/src/PyXRootD.hh:28:
In file included from /System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/Python.h:38:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/string.h:61:15: fatal error:
'string.h' file not found
#include_next <string.h>
1 error generated.
error: command '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc' failed with exit status 1
make[2]: *** [bindings/python/python_bindings] Error 1
make[1]: *** [bindings/python/CMakeFiles/python_target.dir/all] Error 2
make: *** [all] Error 2
and this is probably related to my C++ compiler not having the correct path to the include files. To see what the issue could be, I’ve made a simple C++ file and I tried to compile it.
main.cpp
#include <iostream>
#include <string>
#include <cmath>
#include <vector>
int main()
{
std::string name = "NAMEX";
std::cout << name;
}
First, I tried with the usual “g++” and it worked just fine:
basavyr@Roberts-MacBook-Pro stringTestCLANG % g++ main.cpp
basavyr@Roberts-MacBook-Pro stringTestCLANG % ./a.out
NAMEX% basavyr@Roberts-MacBook-Pro stringTestCLANG %
Then, I tried with /Applications/Xcode.app/Contents/Developer/usr/bin/g++ main.cpp and it worked just fine.
Checking the version of “g++” on my machine gives me this:
g++ -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin19.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
This is interesting, because I was expecting that the default compiler is installed in /usr/bin/ instead. Going into that “InstalledDir” folder I saw that there is no “g++” binary, but only “clang++” and “c++”, so I tried to compile with both and it turns out that both compilers are giving the same error as the one in the project that I trying to build:
basavyr@Roberts-MacBook-Pro stringTestCLANG % /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ main.cpp
In file included from main.cpp:1:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/iostream:38:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ios:216:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__locale:15:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/string:505:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/string_view:176:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__string:57:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:642:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstring:61:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/string.h:61:15: fatal error:
'string.h' file not found
#include_next <string.h>
^~~~~~~~~~
1 error generated.
basavyr@Roberts-MacBook-Pro stringTestCLANG %
Since I also have Command Line Tools installed, I tried to compile with both “g++” and “clang++” from /Library/Developer/CommandLineTools/usr/bin/ and the first one compiles successfully, while the second one throws the same error with regards to the string header file.
basavyr@Roberts-MacBook-Pro stringTestCLANG % /Library/Developer/CommandLineTools/usr/bin/c++ main.cpp
In file included from main.cpp:1:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/iostream:38:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/ios:216:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/__locale:15:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string:505:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string_view:176:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/__string:57:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/algorithm:642:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cstring:61:
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/string.h:61:15: fatal error: 'string.h' file not found
#include_next <string.h>
^~~~~~~~~~
1 error generated.
So, I assume that when I build that project with cmake, it is using one of these compilers (from the XCodeDefault.xctoolchain folder) and it has issues with the string header.
Q1: How can I solve this issue? Q2: And also, why does my “g++” installation directory points to this XCodeDefault.xctoolchain instead of “/usr/bin/’ or “/Applications/Xcode.app/Contents/Developer/usr/bin/”. Is there a way to change that in macOS?
Thank you in advance
