[CMake] Bootstrap fails to detect C++11 compiler on AIX 7.1/XL C 13.1.3 toolset

[Nathan Strong]

I am having difficulty building CMake on AIX 7.1 using IBM XL C 13.1.3,
which seems to be the newest version as of April 2017.

The bootstrap script fails with the following error:

---------------------------------------------
CMake 3.10.1, Copyright 2000-2017 Kitware, Inc. and Contributors
Found XL toolchain
C compiler on this system is: xlc
---------------------------------------------
Error when bootstrapping CMake:
Cannot find a C++ compiler supporting C++11 on this system.
Please specify one using environment variable CXX.
See cmake_bootstrap.log for compilers attempted.
---------------------------------------------
Log of errors: src/cmake-3.10.1/Bootstrap.cmk/cmake_bootstrap.log
---------------------------------------------

Given that AIX is explicitly listed as a supported platform, and I am using
the latest version of the IBM AIX compiler, I find this error dubious.

Below is a the contents of the cmake_bootstrap.log, where we can see that
it does try to use the appropriate -q flag to enable the compiler's
supported C++11 features.

Is XL C simply unsupported?

--- paste below ---
Checking for XL toolchain
Try: xlc
Line: xlc  cmake_bootstrap_18350136_test.c -o cmake_bootstrap_18350136_test
----------  file   -----------------------
int main() { return 0; }
------------------------------------------
Test succeeded
Try: xlC
Line: xlC  cmake_bootstrap_18350136_test.cpp -o
cmake_bootstrap_18350136_test
----------  file   -----------------------
int main() { return 0; }
------------------------------------------
Test succeeded
Checking whether 'xlc  ' works.
Try: xlc
Line: xlc   cmake_bootstrap_18350136_test.c -o cmake_bootstrap_18350136_test
----------  file   -----------------------

#ifdef __cplusplus
# error "The CMAKE_C_COMPILER is set to a C++ compiler"
#endif

#if defined(__sun) && __STDC_VERSION__ < 199901L
#error "On Solaris we need C99."
#endif

#include <stdio.h>

int main(int argc, char* argv[])
{
  printf("%d%c", (argv != 0), (char)0x0a);
  return argc - 1;
}

------------------------------------------
1
Test succeeded
Checking whether 'xlC  ' works.
Try: xlC
Line: xlC   cmake_bootstrap_18350136_test.cxx -o
cmake_bootstrap_18350136_test
----------  file   -----------------------

#include <iostream>
#include <memory>
#include <unordered_map>

#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."
#endif

#if defined(__SUNPRO_CC) && __SUNPRO_CC < 0x5140
#error "SunPro <= 5.13 mode not supported due to bug in move semantics."
#endif

class Class
{
public:
  int Get() const { return this->Member; }
private:
  int Member = 1;
};
int main()
{
  auto const c = std::unique_ptr<Class>(new Class);
  std::cout << c->Get() << std::endl;
  return 0;
}

------------------------------------------
"/opt/IBM/xlC/13.1.3/include/unordered_map", line 71.5: 1540-0859 (S)
#error directive: To use the unordered map library, macro __IBMCPP_TR1__
must be defined
by user to non zero integer value..
"cmake_bootstrap_18350136_test.cxx", line 7.2: 1540-0859 (S) #error
directive: "Compiler is not in a mode aware of C++11.".
Test failed to compile
Checking whether 'xlC  ' works.
Try: xlC
Line: xlC   cmake_bootstrap_18350136_test.cxx -o
cmake_bootstrap_18350136_test
----------  file   -----------------------

#include <iostream>
#include <memory>
#include <unordered_map>

#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."
#endif

#if defined(__SUNPRO_CC) && __SUNPRO_CC < 0x5140
#error "SunPro <= 5.13 mode not supported due to bug in move semantics."
#endif

class Class
{
public:
  int Get() const { return this->Member; }
private:
  int Member = 1;
};
int main()
{
  auto const c = std::unique_ptr<Class>(new Class);
  std::cout << c->Get() << std::endl;
  return 0;
}

------------------------------------------
"/opt/IBM/xlC/13.1.3/include/unordered_map", line 71.5: 1540-0859 (S)
#error directive: To use the unordered map library, macro __IBMCPP_TR1__
must be defined
by user to non zero integer value..
"cmake_bootstrap_18350136_test.cxx", line 7.2: 1540-0859 (S) #error
directive: "Compiler is not in a mode aware of C++11.".
Test failed to compile
Checking whether 'xlC  -qlanglvl=extended1y' works.
Try: xlC
Line: xlC  -qlanglvl=extended1y cmake_bootstrap_18350136_test.cxx -o
cmake_bootstrap_18350136_test
----------  file   -----------------------

#include <iostream>
#include <memory>
#include <unordered_map>

#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."
#endif

#if defined(__SUNPRO_CC) && __SUNPRO_CC < 0x5140
#error "SunPro <= 5.13 mode not supported due to bug in move semantics."
#endif

class Class
{
public:
  int Get() const { return this->Member; }
private:
  int Member = 1;
};
int main()
{
  auto const c = std::unique_ptr<Class>(new Class);
  std::cout << c->Get() << std::endl;
  return 0;
}

------------------------------------------
1540-5200 (W) The option "langlvl=extended1y" is not supported.
"/opt/IBM/xlC/13.1.3/include/unordered_map", line 71.5: 1540-0859 (S)
#error directive: To use the unordered map library, macro __IBMCPP_TR1__
must be defined
by user to non zero integer value..
"cmake_bootstrap_18350136_test.cxx", line 7.2: 1540-0859 (S) #error
directive: "Compiler is not in a mode aware of C++11.".
Test failed to compile
Checking whether 'xlC  ' works.
Try: xlC
Line: xlC   cmake_bootstrap_18350136_test.cxx -o
cmake_bootstrap_18350136_test
----------  file   -----------------------

#include <iostream>
#include <memory>
#include <unordered_map>

#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."
#endif

#if defined(__SUNPRO_CC) && __SUNPRO_CC < 0x5140
#error "SunPro <= 5.13 mode not supported due to bug in move semantics."
#endif

class Class
{
public:
  int Get() const { return this->Member; }
private:
  int Member = 1;
};
int main()
{
  auto const c = std::unique_ptr<Class>(new Class);
  std::cout << c->Get() << std::endl;
  return 0;
}

------------------------------------------
"/opt/IBM/xlC/13.1.3/include/unordered_map", line 71.5: 1540-0859 (S)
#error directive: To use the unordered map library, macro __IBMCPP_TR1__
must be defined
by user to non zero integer value..
"cmake_bootstrap_18350136_test.cxx", line 7.2: 1540-0859 (S) #error
directive: "Compiler is not in a mode aware of C++11.".
Test failed to compile
Checking whether 'xlC  -std=gnu++11' works.
Try: xlC
Line: xlC  -std=gnu++11 cmake_bootstrap_18350136_test.cxx -o
cmake_bootstrap_18350136_test
----------  file   -----------------------

#include <iostream>
#include <memory>
#include <unordered_map>

#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."
#endif

#if defined(__SUNPRO_CC) && __SUNPRO_CC < 0x5140
#error "SunPro <= 5.13 mode not supported due to bug in move semantics."
#endif

class Class
{
public:
  int Get() const { return this->Member; }
private:
  int Member = 1;
};
int main()
{
  auto const c = std::unique_ptr<Class>(new Class);
  std::cout << c->Get() << std::endl;
  return 0;
}

------------------------------------------
/opt/IBM/xlC/13.1.3/bin/.orig/xlC: 1501-210 (W) command option t contains
an incorrect subargument
"/opt/IBM/xlC/13.1.3/include/unordered_map", line 71.5: 1540-0859 (S)
#error directive: To use the unordered map library, macro __IBMCPP_TR1__
must be defined
by user to non zero integer value..
"cmake_bootstrap_18350136_test.cxx", line 7.2: 1540-0859 (S) #error
directive: "Compiler is not in a mode aware of C++11.".
Test failed to compile
Checking whether 'xlC  -qlanglvl=extended0x' works.
Try: xlC
Line: xlC  -qlanglvl=extended0x cmake_bootstrap_18350136_test.cxx -o
cmake_bootstrap_18350136_test
----------  file   -----------------------

#include <iostream>
#include <memory>
#include <unordered_map>

#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."
#endif

#if defined(__SUNPRO_CC) && __SUNPRO_CC < 0x5140
#error "SunPro <= 5.13 mode not supported due to bug in move semantics."
#endif

class Class
{
public:
  int Get() const { return this->Member; }
private:
  int Member = 1;
};
int main()
{
  auto const c = std::unique_ptr<Class>(new Class);
  std::cout << c->Get() << std::endl;
  return 0;
}

------------------------------------------
"/opt/IBM/xlC/13.1.3/include/unordered_map", line 71.5: 1540-0859 (S)
#error directive: To use the unordered map library, macro __IBMCPP_TR1__
must be defined
by user to non zero integer value..
"cmake_bootstrap_18350136_test.cxx", line 7.2: 1540-0859 (S) #error
directive: "Compiler is not in a mode aware of C++11.".
Test failed to compile
Checking whether 'xlC  -qlanglvl=extended0x' works.
Try: xlC
Line: xlC  -qlanglvl=extended0x cmake_bootstrap_18350136_test.cxx -o
cmake_bootstrap_18350136_test
----------  file   -----------------------

#include <iostream>
#include <memory>
#include <unordered_map>

#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."
#endif

#if defined(__SUNPRO_CC) && __SUNPRO_CC < 0x5140
#error "SunPro <= 5.13 mode not supported due to bug in move semantics."
#endif

class Class
{
public:
  int Get() const { return this->Member; }
private:
  int Member = 1;
};
int main()
{
  auto const c = std::unique_ptr<Class>(new Class);
  std::cout << c->Get() << std::endl;
  return 0;
}

------------------------------------------
"/opt/IBM/xlC/13.1.3/include/unordered_map", line 71.5: 1540-0859 (S)
#error directive: To use the unordered map library, macro __IBMCPP_TR1__
must be defined
by user to non zero integer value..
"cmake_bootstrap_18350136_test.cxx", line 7.2: 1540-0859 (S) #error
directive: "Compiler is not in a mode aware of C++11.".
Test failed to compile
Checking whether 'xlC  -qlanglvl=extended0x' works.
Try: xlC
Line: xlC  -qlanglvl=extended0x cmake_bootstrap_18350136_test.cxx -o
cmake_bootstrap_18350136_test
----------  file   -----------------------

#include <iostream>
#include <memory>
#include <unordered_map>

#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."
#endif

#if defined(__SUNPRO_CC) && __SUNPRO_CC < 0x5140
#error "SunPro <= 5.13 mode not supported due to bug in move semantics."
#endif

class Class
{
public:
  int Get() const { return this->Member; }
private:
  int Member = 1;
};
int main()
{
  auto const c = std::unique_ptr<Class>(new Class);
  std::cout << c->Get() << std::endl;
  return 0;
}

------------------------------------------
"/opt/IBM/xlC/13.1.3/include/unordered_map", line 71.5: 1540-0859 (S)
#error directive: To use the unordered map library, macro __IBMCPP_TR1__
must be defined
by user to non zero integer value..
"cmake_bootstrap_18350136_test.cxx", line 7.2: 1540-0859 (S) #error
directive: "Compiler is not in a mode aware of C++11.".
Test failed to compile
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