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CMakeLists.txt: include CXX in project languages only when using TBB #519

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CMakeLists.txt: include CXX in project languages only when using TBB #519

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22 changes: 15 additions & 7 deletions c/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -9,17 +9,23 @@ if (POLICY CMP0102)
cmake_policy(SET CMP0102 NEW)
endif()

option(BLAKE3_USE_TBB "Enable oneTBB parallelism" OFF)
option(BLAKE3_FETCH_TBB "Allow fetching oneTBB from GitHub if not found on system" OFF)

if(BLAKE3_USE_TBB OR BLAKE3_FETCH_TBB)
set(BLAKE3_LANGUAGES C CXX ASM)
else()
set(BLAKE3_LANGUAGES C ASM)
endif()

project(libblake3
VERSION 1.8.2
DESCRIPTION "BLAKE3 C implementation"
LANGUAGES C CXX ASM
LANGUAGES ${BLAKE3_LANGUAGES}
)

list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

option(BLAKE3_USE_TBB "Enable oneTBB parallelism" OFF)
option(BLAKE3_FETCH_TBB "Allow fetching oneTBB from GitHub if not found on system" OFF)

include(CTest)
include(FeatureSummary)
include(GNUInstallDirs)
Expand Down Expand Up @@ -147,9 +153,11 @@ set_target_properties(blake3 PROPERTIES
C_EXTENSIONS OFF
)
target_compile_features(blake3 PUBLIC c_std_99)
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.12)
target_compile_features(blake3 PUBLIC cxx_std_20)
# else: add it further below through `BLAKE3_CMAKE_CXXFLAGS_*`
if(BLAKE3_USE_TBB OR BLAKE3_FETCH_TBB)
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.12)
target_compile_features(blake3 PUBLIC cxx_std_20)
# else: add it further below through `BLAKE3_CMAKE_CXXFLAGS_*`
endif()
endif()

# ensure C_EXTENSIONS OFF is respected without overriding CMAKE_C_STANDARD
Expand Down
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