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mdbx-cmake: makes an C++ compiler optional.

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Change-Id: Id1445a95e4a458012e77e1e505563025f0471487
This commit is contained in:
Leonid Yuriev 2020-09-27 16:49:55 +03:00
parent 2c088a17c4
commit cea56c3840
2 changed files with 27 additions and 2 deletions
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26
CMakeLists.txt
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@ -88,10 +88,11 @@ if(DEFINED PROJECT_NAME)
if(NOT MDBX_AMALGAMATED_SOURCE AND NOT DEFINED BUILD_TESTING)
set(BUILD_TESTING OFF)
endif()
enable_language(C)
else()
set(SUBPROJECT OFF)
set(NOT_SUBPROJECT ON)
project(libmdbx C CXX)
project(libmdbx C)
if(NOT MDBX_AMALGAMATED_SOURCE AND NOT DEFINED BUILD_TESTING)
set(BUILD_TESTING ON)
endif()
@ -102,6 +103,20 @@ if(MDBX_AMALGAMATED_SOURCE AND DEFINED MDBX_ENABLE_TESTS AND MDBX_ENABLE_TESTS)
set(MDBX_ENABLE_TESTS OFF)
endif()
# Try to find a C++ compiler unless sure that this is unnecessary.
if (NOT CMAKE_CXX_COMPILER)
include(CheckLanguage)
if(NOT DEFINED MDBX_BUILD_CXX OR MDBX_BUILD_CXX
OR (NOT MDBX_AMALGAMATED_SOURCE AND (NOT DEFINED MDBX_ENABLE_TESTS OR MDBX_ENABLE_TESTS)))
check_language(CXX)
if(CMAKE_CXX_COMPILER)
enable_language(CXX)
endif()
endif()
else()
enable_language(CXX)
endif()
if(NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE MinSizeRel CACHE STRING
"Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
@ -441,7 +456,7 @@ else()
unset(MDBX_LINK_TOOLS_NONSTATIC CACHE)
endif()
if(MDBX_CXX_STANDARD GREATER_EQUAL 11 AND MDBX_CXX_STANDARD LESS 83)
if(CMAKE_CXX_COMPILER AND MDBX_CXX_STANDARD GREATER_EQUAL 11 AND MDBX_CXX_STANDARD LESS 83)
if(NOT MDBX_AMALGAMATED_SOURCE)
option(MDBX_ENABLE_TESTS "Build MDBX tests" ${BUILD_TESTING})
endif()
@ -461,6 +476,10 @@ endif()
################################################################################
################################################################################
if(MDBX_BUILD_CXX AND NOT CMAKE_CXX_COMPILER)
message(FATAL_ERROR "MDBX_BUILD_CXX=${MDBX_BUILD_CXX}: The C++ compiler is required to build the C++API.")
endif()
# Get version
fetch_version(MDBX "${CMAKE_CURRENT_SOURCE_DIR}" FALSE)
message(STATUS "libmdbx version is ${MDBX_VERSION}")
@ -799,6 +818,9 @@ add_definitions(-DMDBX_CONFIG_H="${CMAKE_CURRENT_BINARY_DIR}/config.h")
################################################################################
if(NOT MDBX_AMALGAMATED_SOURCE AND MDBX_ENABLE_TESTS)
if(NOT CMAKE_CXX_COMPILER)
message(FATAL_ERROR "MDBX_ENABLE_TESTS=${MDBX_ENABLE_TESTS}: The C++ compiler is required to build the tests.")
endif()
add_subdirectory(test)
endif()

3
test/CMakeLists.txt
View File

@ -1,3 +1,6 @@
enable_language(CXX)
include(../cmake/compiler.cmake)
add_executable(mdbx_test
base.h
cases.cc