FindOpenMP: Detect version (specification date) from compiler
Port changes from VTK commit fda6a31cb9 (Added Improved FindOpenMP module, 2015-04-23). Improve use of try_compile to avoid needing to pass OpenMP flags as libraries.
This commit is contained in:
Sujin Philip
Brad King
parent
8f1103c0fd
commit
73e9f36ea6
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@ -0,0 +1,5 @@
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FindOpenMP-updates
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------------------
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* The :module:`FindOpenMP` module learned to detect the OpenMP
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version (specification date) from the compiler.
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@ -20,6 +20,19 @@
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# Flags to add to the Fortran compiler for OpenMP support.
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# ``OPENMP_FOUND``
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# True if openmp is detected.
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#
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# The following internal variables are set, if detected:
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#
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# ``OpenMP_C_SPEC_DATE``
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# Specification date of OpenMP version of C compiler.
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# ``OpenMP_CXX_SPEC_DATE``
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# Specification date of OpenMP version of CXX compiler.
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# ``OpenMP_Fortran_SPEC_DATE``
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# Specification date of OpenMP version of Fortran compiler.
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#
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# The specification dates are formatted as integers of the form
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# ``CCYYMM`` where these represent the decimal digits of the century,
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# year, and month.
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#=============================================================================
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# Copyright 2009 Kitware, Inc.
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@ -119,6 +132,75 @@ set(OpenMP_Fortran_TEST_SOURCE
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"
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)
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set(OpenMP_C_CXX_CHECK_VERSION_SOURCE
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"
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#include <stdio.h>
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#include <omp.h>
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const char ompver_str[] = { 'I', 'N', 'F', 'O', ':', 'O', 'p', 'e', 'n', 'M',
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'P', '-', 'd', 'a', 't', 'e', '[',
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('0' + ((_OPENMP/100000)%10)),
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('0' + ((_OPENMP/10000)%10)),
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('0' + ((_OPENMP/1000)%10)),
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('0' + ((_OPENMP/100)%10)),
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('0' + ((_OPENMP/10)%10)),
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('0' + ((_OPENMP/1)%10)),
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']', '\\0' };
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int main(int argc, char *argv[])
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{
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printf(\"%s\\n\", ompver_str);
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return 0;
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}
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")
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set(OpenMP_Fortran_CHECK_VERSION_SOURCE
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"
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program omp_ver
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use omp_lib
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integer, parameter :: zero = ichar('0')
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integer, parameter :: ompv = openmp_version
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character, dimension(24), parameter :: ompver_str =&
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(/ 'I', 'N', 'F', 'O', ':', 'O', 'p', 'e', 'n', 'M', 'P', '-',&
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'd', 'a', 't', 'e', '[',&
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char(zero + mod(ompv/100000, 10)),&
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char(zero + mod(ompv/10000, 10)),&
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char(zero + mod(ompv/1000, 10)),&
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char(zero + mod(ompv/100, 10)),&
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char(zero + mod(ompv/10, 10)),&
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char(zero + mod(ompv/1, 10)), ']' /)
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print *, ompver_str
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end program omp_ver
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")
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function(_OPENMP_GET_SPEC_DATE LANG SPEC_DATE)
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set(WORK_DIR ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/FindOpenMP)
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if("${LANG}" STREQUAL "C")
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set(SRC_FILE ${WORK_DIR}/ompver.c)
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file(WRITE ${SRC_FILE} "${OpenMP_C_CXX_CHECK_VERSION_SOURCE}")
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elseif("${LANG}" STREQUAL "CXX")
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set(SRC_FILE ${WORK_DIR}/ompver.cpp)
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file(WRITE ${SRC_FILE} "${OpenMP_C_CXX_CHECK_VERSION_SOURCE}")
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else() # ("${LANG}" STREQUAL "Fortran")
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set(SRC_FILE ${WORK_DIR}/ompver.f90)
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file(WRITE ${SRC_FILE} "${OpenMP_Fortran_CHECK_VERSION_SOURCE}")
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endif()
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set(BIN_FILE ${WORK_DIR}/ompver_${LANG}.bin)
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try_compile(OpenMP_TRY_COMPILE_RESULT ${CMAKE_BINARY_DIR} ${SRC_FILE}
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CMAKE_FLAGS "-DCOMPILE_DEFINITIONS:STRING=${OpenMP_${LANG}_FLAGS}"
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COPY_FILE ${BIN_FILE})
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if(${OpenMP_TRY_COMPILE_RESULT})
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file(STRINGS ${BIN_FILE} specstr LIMIT_COUNT 1 REGEX "INFO:OpenMP-date")
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set(regex_spec_date ".*INFO:OpenMP-date\\[0*([^]]*)\\].*")
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if("${specstr}" MATCHES "${regex_spec_date}")
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set(${SPEC_DATE} "${CMAKE_MATCH_1}" PARENT_SCOPE)
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endif()
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endif()
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unset(OpenMP_TRY_COMPILE_RESULT CACHE)
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endfunction()
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# check c compiler
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if(CMAKE_C_COMPILER_LOADED)
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# if these are set then do not try to find them again,
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@ -150,6 +232,12 @@ if(CMAKE_C_COMPILER_LOADED)
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list(APPEND _OPENMP_REQUIRED_VARS OpenMP_C_FLAGS)
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unset(OpenMP_C_FLAG_CANDIDATES)
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if (NOT OpenMP_C_SPEC_DATE)
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_OPENMP_GET_SPEC_DATE("C" OpenMP_C_SPEC_DATE_INTERNAL)
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set(OpenMP_C_SPEC_DATE "${OpenMP_C_SPEC_DATE_INTERNAL}" CACHE
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INTERNAL "C compiler's OpenMP specification date")
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endif()
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endif()
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# check cxx compiler
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@ -186,6 +274,12 @@ if(CMAKE_CXX_COMPILER_LOADED)
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list(APPEND _OPENMP_REQUIRED_VARS OpenMP_CXX_FLAGS)
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unset(OpenMP_CXX_FLAG_CANDIDATES)
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if (NOT OpenMP_CXX_SPEC_DATE)
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_OPENMP_GET_SPEC_DATE("CXX" OpenMP_CXX_SPEC_DATE_INTERNAL)
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set(OpenMP_CXX_SPEC_DATE "${OpenMP_CXX_SPEC_DATE_INTERNAL}" CACHE
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INTERNAL "C++ compiler's OpenMP specification date")
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endif()
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endif()
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# check Fortran compiler
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@ -219,6 +313,12 @@ if(CMAKE_Fortran_COMPILER_LOADED)
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list(APPEND _OPENMP_REQUIRED_VARS OpenMP_Fortran_FLAGS)
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unset(OpenMP_Fortran_FLAG_CANDIDATES)
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if (NOT OpenMP_Fortran_SPEC_DATE)
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_OPENMP_GET_SPEC_DATE("Fortran" OpenMP_Fortran_SPEC_DATE_INTERNAL)
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set(OpenMP_Fortran_SPEC_DATE "${OpenMP_Fortran_SPEC_DATE_INTERNAL}" CACHE
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INTERNAL "Fortran compiler's OpenMP specification date")
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endif()
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endif()
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set(CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET_SAVE})
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@ -239,3 +339,5 @@ endif()
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unset(OpenMP_C_TEST_SOURCE)
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unset(OpenMP_CXX_TEST_SOURCE)
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unset(OpenMP_Fortran_TEST_SOURCE)
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unset(OpenMP_C_CXX_CHECK_VERSION_SOURCE)
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unset(OpenMP_Fortran_CHECK_VERSION_SOURCE)
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