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Prevent infinite loop in DependentOption 

Signed-off-by: Tin <tin.svagelj@live.com>
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Tin 2023-11-11 00:45:11 +01:00 committed by Brenden Matthews
parent cbfdb13f50
commit 2e17a53d49
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1 changed files with 10 additions and 3 deletions
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13
cmake/DependentOption.cmake
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@ -19,8 +19,6 @@ isn't "possible".
Actual checks are deferred until RUN_DEPENDENCY_CHECKS() is called in order to
allow out of order declaration of dependencies and dependecy graph cycles.
As the checks can affect each other they're run in a loop until the graph settles.
That means CMake can end up in an infinite loop, though it shouldn't happen with
normal use... (i.e. disable A if B not present)
#]=======================================================================]
set(__DEPENDENT_OPTIONS_CHANGE_HAPPENED true)
@ -51,10 +49,19 @@ macro(DEPENDENT_OPTION option doc default depends else warn)
endmacro()
macro(RUN_DEPENDENCY_CHECKS)
# controls max allowed dependency chain to avoid infinite loops during
# configure phase
set(__DEPENDENT_OPTIONS_LOOP_COUNTER 10)
while(__DEPENDENT_OPTIONS_CHANGE_HAPPENED)
MATH(EXPR __DEPENDENT_OPTIONS_LOOP_COUNTER "${__DEPENDENT_OPTIONS_LOOP_COUNTER}-1")
set(__DEPENDENT_OPTIONS_CHANGE_HAPPENED false)
cmake_language(EVAL CODE "${__DEPENDENT_OPTIONS_LATER_INVOKED_CODE}")
if(__DEPENDENT_OPTIONS_LOOP_COUNTER LESS_EQUAL "0")
break()
endif()
endwhile()
unset(__DEPENDENT_OPTIONS_LOOP_COUNTER)
set(__DEPENDENT_OPTIONS_CHANGE_HAPPENED true)
set(__DEPENDENT_OPTIONS_LATER_INVOKED_CODE "")
endmacro()
endmacro()