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CMake: Only search for OpenACC if the corresponding option is active #60

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Sep 25, 2024
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CMake: Only search for OpenACC if the corresponding option is active #60

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20 changes: 14 additions & 6 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -46,14 +46,22 @@ elseif( FYPP MATCHES FYPP-NOTFOUND )
endif()

## find OpenACC
### Workaround for CMake bug (fixed in CMake 3.25)
find_package(OpenACC COMPONENTS Fortran)
if( OpenACC_Fortran_FOUND )
set( OpenACC_FOUND ON )
if( ${CMAKE_VERSION} VERSION_LESS "3.25" )
if ( FIELD_API_ENABLE_ACC OR (NOT DEFINED FIELD_API_ENABLE_ACC AND (ENABLE_ACC OR NOT DEFINED ENABLE_ACC)) )
# See https://gitlab.kitware.com/cmake/cmake/-/issues/23691, fixed in CMake 3.25
# (TL;DR: FindOpenACC sets OpenACC_<LANG>_FOUND correctly but does not set
# OpenACC_FOUND unless all three C, CXX, and Fortran have been found - even if
# only one language has been requested via COMPONENTS)
find_package( OpenACC COMPONENTS Fortran )
if( OpenACC_Fortran_FOUND )
set( OpenACC_FOUND ON )
endif()
endif()
endif()
ecbuild_add_option( FEATURE ACC
DESCRIPTION "OpenACC" DEFAULT ON
CONDITION OpenACC_FOUND )
DEFAULT ON
DESCRIPTION "Support for using GPUs with OpenACC"
REQUIRED_PACKAGES "OpenACC COMPONENTS Fortran" )

## set general compiler flags
include(cmake/field_api_compile_options.cmake)
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