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10 April 2024, 19:27:19 UTC
Revision 1c14691a86ab8c6939dd04707dc2a92125fa8629 authored by Raul Tambre on 07 February 2021, 09:27:21 UTC, committed by Brad King on 09 July 2021, 15:27:47 UTC 
CMakeCCompilerId: Fix C standard detection in Clang and IntelLLVM MSVC mode
 
Clang does not define `__STDC__` if in MSVC compatibility mode, but does
define `__STDC_VERSION__`.  Avoid the fallback for this combination.

This backports commit 7596d8b951 (CMakeCCompilerId: Fix C standard
detection in Clang MSVC mode, 2021-02-07, v3.21.0-rc1~587^2~14) to the
3.20 release series.  This is needed since commit 5115dd1e2c (IntelLLVM:
Fix C/C++ standard level flags on Windows, 2021-07-07, v3.21.0-rc3~7^2^2)
now that we activate C/C++ standard level logic for IntelLLVM when
targeting the MSVC ABI.
1 parent 5115dd1
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Tip revision: 1c14691a86ab8c6939dd04707dc2a92125fa8629 authored by Raul Tambre on 07 February 2021, 09:27:21 UTC
CMakeCCompilerId: Fix C standard detection in Clang and IntelLLVM MSVC mode
Tip revision: 1c14691
TestForANSIForScope.cmake 
# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
TestForANSIForScope
-------------------

Check for ANSI for scope support

Check if the compiler restricts the scope of variables declared in a
for-init-statement to the loop body.

::

  CMAKE_NO_ANSI_FOR_SCOPE - holds result
#]=======================================================================]

if(NOT DEFINED CMAKE_ANSI_FOR_SCOPE)
  message(CHECK_START "Check for ANSI scope")
  try_compile(CMAKE_ANSI_FOR_SCOPE  ${CMAKE_BINARY_DIR}
    ${CMAKE_ROOT}/Modules/TestForAnsiForScope.cxx
    OUTPUT_VARIABLE OUTPUT)
  if (CMAKE_ANSI_FOR_SCOPE)
    message(CHECK_PASS "found")
    set (CMAKE_NO_ANSI_FOR_SCOPE 0 CACHE INTERNAL
      "Does the compiler support ansi for scope.")
    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
      "Determining if the CXX compiler understands ansi for scopes passed with "
      "the following output:\n${OUTPUT}\n\n")
  else ()
    message(CHECK_FAIL "not found")
    set (CMAKE_NO_ANSI_FOR_SCOPE 1 CACHE INTERNAL
      "Does the compiler support ansi for scope.")
    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
      "Determining if the CXX compiler understands ansi for scopes failed with "
      "the following output:\n${OUTPUT}\n\n")
  endif ()
endif()
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