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cmake: skip probes for required C++ standard #2113

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cmake: skip probes for required C++ standard #2113

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23 changes: 16 additions & 7 deletions CMake/AbseilDll.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -724,10 +724,18 @@ set(ABSL_INTERNAL_TEST_DLL_TARGETS
"status_matchers"
)

include(CheckCXXSourceCompiles)
if(DEFINED CMAKE_CXX_STANDARD AND CMAKE_CXX_STANDARD_REQUIRED)
if(CMAKE_CXX_STANDARD GREATER_EQUAL 20)
set(ABSL_INTERNAL_AT_LEAST_CXX20 ON)
set(ABSL_INTERNAL_AT_LEAST_CXX17 ON)
elseif(CMAKE_CXX_STANDARD GREATER_EQUAL 17)
set(ABSL_INTERNAL_AT_LEAST_CXX17 ON)
endif()
else()
include(CheckCXXSourceCompiles)

check_cxx_source_compiles(
[==[
check_cxx_source_compiles(
[==[
#ifdef _MSC_VER
# if _MSVC_LANG < 201703L
# error "The compiler defaults or is configured for C++ < 17"
Expand All @@ -737,10 +745,10 @@ check_cxx_source_compiles(
#endif
int main() { return 0; }
]==]
ABSL_INTERNAL_AT_LEAST_CXX17)
ABSL_INTERNAL_AT_LEAST_CXX17)

check_cxx_source_compiles(
[==[
check_cxx_source_compiles(
[==[
#ifdef _MSC_VER
# if _MSVC_LANG < 202002L
# error "The compiler defaults or is configured for C++ < 20"
Expand All @@ -750,7 +758,8 @@ check_cxx_source_compiles(
#endif
int main() { return 0; }
]==]
ABSL_INTERNAL_AT_LEAST_CXX20)
ABSL_INTERNAL_AT_LEAST_CXX20)
endif()

if(ABSL_INTERNAL_AT_LEAST_CXX20)
set(ABSL_INTERNAL_CXX_STD_FEATURE cxx_std_20)
Expand Down