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cmake: require C++ 20 for the engine, native and Saigo-built games #2011

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Merged
illwieckz merged 1 commit into from
Oct 15, 2026
Merged

cmake: require C++ 20 for the engine, native and Saigo-built games #2011

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24 changes: 17 additions & 7 deletions cmake/DaemonFlags.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -363,13 +363,23 @@ else()
message(FATAL_ERROR "GNU++23 is not supported by the compiler")
endif()
else()
# PNaCl only defines isascii if __STRICT_ANSI__ is not defined,
# always prefer GNU dialect.
try_cxx_flag(GNUXX14 "-std=gnu++14")
if (NOT FLAG_GNUXX14)
try_cxx_flag(GNUXX1Y "-std=gnu++1y")
if (NOT FLAG_GNUXX1Y)
message(FATAL_ERROR "GNU++14 is not supported by the compiler")
if (YOKAI_TARGET_SYSTEM_NACL AND NOT USE_NACL_SAIGO)
# PNaCl only defines isascii if __STRICT_ANSI__ is not defined,
# always prefer GNU dialect.
try_cxx_flag(GNUXX14 "-std=gnu++14")
if (NOT FLAG_GNUXX14)
try_cxx_flag(GNUXX1Y "-std=gnu++1y")
if (NOT FLAG_GNUXX1Y)
message(FATAL_ERROR "GNU++14 is not supported by the compiler")
endif()
endif()
else()
try_cxx_flag(GNUXX20 "-std=gnu++20")
if (NOT FLAG_GNUXX20)
try_cxx_flag(GNUXX2Y "-std=gnu++2a")
if (NOT FLAG_GNUXX2Y)
message(FATAL_ERROR "GNU++20 is not supported by the compiler")
endif()
endif()
endif()
endif()
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