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56 lines
2.4 KiB
56 lines
2.4 KiB
# Test whether the compiler supports explicit template instantiation.
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# This actually creates a class template instantiation in one source
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# file and tries to use it from another. This approach checks that
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# both the instantiation syntax and symbol linkage is handled
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# properly.
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IF("VTK_EXPLICIT_TEMPLATES" MATCHES "^VTK_EXPLICIT_TEMPLATES")
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MESSAGE(STATUS "Checking support for C++ explicit template instantiation")
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MAKE_DIRECTORY(${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation)
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STRING(ASCII 35 POUND)
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WRITE_FILE(
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${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/CMakeLists.txt
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"PROJECT(EXPLICIT)\n"
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"ADD_LIBRARY(A A.cxx)\n"
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"ADD_EXECUTABLE(B B.cxx)\n"
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"TARGET_LINK_LIBRARIES(B A)\n"
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)
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WRITE_FILE(
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${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/A.h
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"${POUND}ifndef A_h\n"
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"${POUND}define A_h\n"
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"template <class T> class A { public: static T Method(); };\n"
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"${POUND}endif\n"
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)
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WRITE_FILE(
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${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/A.cxx
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"${POUND}include \"A.h\"\n"
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"template <class T> T A<T>::Method() { return 0; }\n"
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"template class A<int>;"
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)
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WRITE_FILE(
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${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/B.cxx
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"${POUND}include \"A.h\"\n"
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"int main() { return A<int>::Method(); }\n"
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)
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TRY_COMPILE(VTK_EXPLICIT_TEMPLATES
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${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/Build
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${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation
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EXPLICIT OUTPUT_VARIABLE OUTPUT
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)
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IF(VTK_EXPLICIT_TEMPLATES)
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MESSAGE(STATUS "Checking support for C++ explicit template instantiation -- yes")
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SET(VTK_EXPLICIT_TEMPLATES 1 CACHE INTERNAL "Support for C++ explict templates")
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WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
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"Determining if the C++ compiler supports explict template instantiation "
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"passed with the following output:\n"
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"${OUTPUT}\n" APPEND)
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ELSE(VTK_EXPLICIT_TEMPLATES)
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MESSAGE(STATUS "Checking support for C++ explicit template instantiation -- no")
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SET(VTK_EXPLICIT_TEMPLATES 0 CACHE INTERNAL "Support for C++ explict templates")
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WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
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"Determining if the C++ compiler supports explict template instantiation "
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"failed with the following output:\n"
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"${OUTPUT}\n" APPEND)
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ENDIF(VTK_EXPLICIT_TEMPLATES)
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ENDIF("VTK_EXPLICIT_TEMPLATES" MATCHES "^VTK_EXPLICIT_TEMPLATES")
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