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[win] Increase CXX_STANDARD_STRING with VS 2026 #20398

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Merged
merged 3 commits into from
Nov 12, 2025
Merged

[win] Increase CXX_STANDARD_STRING with VS 2026 #20398

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651d00a
[win] Increase CXX_STANDARD_STRING with VS 2026
bellenot Nov 12, 2025
f977e8f
Fix compilation error with /std:c++20
bellenot Nov 12, 2025
d32cc2f
Add missing #include with /std:c++20
bellenot Nov 12, 2025
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6 changes: 5 additions & 1 deletion cmake/modules/CheckCompiler.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -162,7 +162,11 @@ endif()
# so we check the value of __cplusplus.
# This default value can be overridden by specifying one at the prompt.
if (MSVC)
set(CXX_STANDARD_STRING "201703L")
if(MSVC_VERSION GREATER_EQUAL 1950)
set(CXX_STANDARD_STRING "202002L")
else()
set(CXX_STANDARD_STRING "201703L")
endif()
else()
execute_process(COMMAND echo __cplusplus
COMMAND ${CMAKE_CXX_COMPILER} -E -x c++ -
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1 change: 1 addition & 0 deletions io/io/test/TFileTests.cxx
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@@ -1,6 +1,7 @@
#include <memory>
#include <vector>
#include <string>
#include <array>

#include "gtest/gtest.h"

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1 change: 1 addition & 0 deletions roottest/root/io/evolution/rules/execSourceTypes.cxx
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Expand Up @@ -8,6 +8,7 @@
#include <type_traits>
#include <list>
#include <string>
#include <array>

struct A {
float f = 1.1;
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