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if (NOT DRACO_CMAKE_COMPILER_TESTS_CMAKE_)
set(DRACO_CMAKE_COMPILER_TESTS_CMAKE_ 1)
include(CheckCSourceCompiles)
include(CheckCXXSourceCompiles)
# The basic main() macro used in all compile tests.
set(DRACO_C_MAIN "\nint main(void) { return 0; }")
set(DRACO_CXX_MAIN "\nint main() { return 0; }")
# Strings containing the names of passed and failed tests.
set(DRACO_C_PASSED_TESTS)
set(DRACO_C_FAILED_TESTS)
set(DRACO_CXX_PASSED_TESTS)
set(DRACO_CXX_FAILED_TESTS)
macro(draco_push_var var new_value)
set(SAVED_${var} ${var})
set(${var} ${new_value})
endmacro ()
macro(draco_pop_var var)
set(var ${SAVED_${var}})
unset(SAVED_${var})
endmacro ()
# Confirms $test_source compiles and stores $test_name in one of
# $DRACO_C_PASSED_TESTS or $DRACO_C_FAILED_TESTS depending on out come. When the
# test passes $result_var is set to 1. When it fails $result_var is unset.
# The test is not run if the test name is found in either of the passed or
# failed test variables.
macro(draco_check_c_compiles test_name test_source result_var)
unset(C_TEST_PASSED CACHE)
unset(C_TEST_FAILED CACHE)
string(FIND "${DRACO_C_PASSED_TESTS}" "${test_name}" C_TEST_PASSED)
string(FIND "${DRACO_C_FAILED_TESTS}" "${test_name}" C_TEST_FAILED)
if (${C_TEST_PASSED} EQUAL -1 AND ${C_TEST_FAILED} EQUAL -1)
unset(C_TEST_COMPILED CACHE)
message("Running C compiler test: ${test_name}")
check_c_source_compiles("${test_source} ${DRACO_C_MAIN}" C_TEST_COMPILED)
set(${result_var} ${C_TEST_COMPILED})
if (${C_TEST_COMPILED})
string(APPEND DRACO_C_PASSED_TESTS " ${test_name}")
else ()
string(APPEND DRACO_C_FAILED_TESTS " ${test_name}")
message("C Compiler test ${test_name} failed.")
endif ()
elseif (NOT ${C_TEST_PASSED} EQUAL -1)
set(${result_var} 1)
else () # ${C_TEST_FAILED} NOT EQUAL -1
unset(${result_var})
endif ()
endmacro ()
# Confirms $test_source compiles and stores $test_name in one of
# $DRACO_CXX_PASSED_TESTS or $DRACO_CXX_FAILED_TESTS depending on out come. When
# the test passes $result_var is set to 1. When it fails $result_var is unset.
# The test is not run if the test name is found in either of the passed or
# failed test variables.
macro(draco_check_cxx_compiles test_name test_source result_var)
unset(CXX_TEST_PASSED CACHE)
unset(CXX_TEST_FAILED CACHE)
string(FIND "${DRACO_CXX_PASSED_TESTS}" "${test_name}" CXX_TEST_PASSED)
string(FIND "${DRACO_CXX_FAILED_TESTS}" "${test_name}" CXX_TEST_FAILED)
if (${CXX_TEST_PASSED} EQUAL -1 AND ${CXX_TEST_FAILED} EQUAL -1)
unset(CXX_TEST_COMPILED CACHE)
message("Running CXX compiler test: ${test_name}")
check_cxx_source_compiles("${test_source} ${DRACO_CXX_MAIN}"
CXX_TEST_COMPILED)
set(${result_var} ${CXX_TEST_COMPILED})
if (${CXX_TEST_COMPILED})
string(APPEND DRACO_CXX_PASSED_TESTS " ${test_name}")
else ()
string(APPEND DRACO_CXX_FAILED_TESTS " ${test_name}")
message("CXX Compiler test ${test_name} failed.")
endif ()
elseif (NOT ${CXX_TEST_PASSED} EQUAL -1)
set(${result_var} 1)
else () # ${CXX_TEST_FAILED} NOT EQUAL -1
unset(${result_var})
endif ()
endmacro ()
# Convenience macro that confirms $test_source compiles as C and C++.
# $result_var is set to 1 when both tests are successful, and 0 when one or both
# tests fail.
# Note: This macro is intended to be used to write to result variables that
# are expanded via configure_file(). $result_var is set to 1 or 0 to allow
# direct usage of the value in generated source files.
macro(draco_check_source_compiles test_name test_source result_var)
unset(C_PASSED)
unset(CXX_PASSED)
draco_check_c_compiles(${test_name} ${test_source} C_PASSED)
draco_check_cxx_compiles(${test_name} ${test_source} CXX_PASSED)
if (${C_PASSED} AND ${CXX_PASSED})
set(${result_var} 1)
else ()
set(${result_var} 0)
endif ()
endmacro ()
# When inline support is detected for the current compiler the supported
# inlining keyword is written to $result in caller scope.
macro (draco_get_inline result)
draco_check_source_compiles("inline_check_1"
"static inline void macro(void) {}"
HAVE_INLINE_1)
if (HAVE_INLINE_1 EQUAL 1)
set(${result} "inline")
return()
endif ()
# Check __inline.
draco_check_source_compiles("inline_check_2"
"static __inline void macro(void) {}"
HAVE_INLINE_2)
if (HAVE_INLINE_2 EQUAL 1)
set(${result} "__inline")
endif ()
endmacro ()
endif () # DRACO_CMAKE_COMPILER_TESTS_CMAKE_
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