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Per legacy, the else() and endif() commands admit an optional <condition> argument. If used, it must be a verbatim repeat of the argument of the opening if ...

Conditional Statement (if) ... There are two allowable syntaxes: if(something) do something else(something) # the argument must match the if(...) ...

I have a problem using option together with if-else statement in cmake. project ...

elseif — CMake 3.23.0-rc4 Documentation elseif ¶ Starts an elseif portion of an if block. elseif (<condition>) See the if () command, especially for the syntax and logic of the <condition>.

The if command was written very early in CMake's history, predating the ${} variable evaluation syntax, and for convenience evaluates variables named by …

Purpose of CMake ENDIF and ELSE arguments These expressions are optional as you said and they are useful when you have nested if () statements - cmake will warn you when expr in endif () doesn't match expr in nearest if (). The same is for else (). Simply - this protects you from mistakes in if () else () endif () nested chains.

You may have multiple elseif clauses. Note that the expression in the else and endif clause is optional. Long expressions can be used and there is a traditional ...

For ease of use and to pass information from CMake to Sphinx, ... so return early if(NOT Sphinx_FOUND) return() endif() # add_sphinx_document( # <name> ...

CMake has an if statement, though over the years it has become rather complex. ... endif() # If variable does not expand to one of the above, CMake will ...

Apr 06, 2015 · As of CMake 2.6.0 the ELSE () and ENDIF () constructs can be empty. The same is true for closing constructs on ENDMACRO (), ENDFUNCTION (), and ENDFOREACH (). If you require 2.4.x compatibility, CMake 2.4.3 or greater recognizes the CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS option (which is superfluous in 2.6.0)

if / else / endif looks like this in CMake: minimal-cmake-if-else-endif-example.txt Copy to clipboard⇓ Download. if(myvar).

set(A "") if(A STREQUAL "") message("Value of A is empty string") endif() ... Since CMake accepts any names of the variables you can't filter out <variable> ...

if — CMake 3.23.0-rc2 Documentation if ¶ Conditionally execute a group of commands. Synopsis ¶ if (<condition>) <commands> elseif (<condition>) # optional block, can be repeated <commands> else () # optional block <commands> endif () Evaluates the condition argument of the if clause according to the Condition syntax described below.

05.04.2015 · As of CMake 2.6.0 the ELSE () and ENDIF () constructs can be empty. The same is true for closing constructs on ENDMACRO (), ENDFUNCTION (), and ENDFOREACH (). If you require 2.4.x compatibility, CMake 2.4.3 or greater recognizes the CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS option (which is superfluous in 2.6.0) Other than …

Mar 31, 2009 · Previous message: [CMake] Bug in if/else/endif in combination with option? CMake if commands are interesting in the sense that variable names can be used directly. In most other languages you have to explicitly dereference the variable to get the value out. I think when you use a string that is the same name as a variable you are getting ...

See the if() command, especially for the syntax and logic of the <condition>.

30.04.2015 · The documentation was ambiguous on else, but adamant on endif: Note that the same expression must be given to if, and endif. The first try to remove this constraint was introduced already with CMake 2.4.3 (year 2006), where it was possible to deactivate it by writing:

How can we achieve more control over the build system generated by CMake? ... Learn the syntax for conditionals in CMake: if - elseif - else - endif.

31.03.2009 · Previous message: [CMake] Bug in if/else/endif in combination with option? CMake if commands are interesting in the sense that variable names can be used directly. In most other languages you have to explicitly dereference the variable to get the value out. I think when you use a string that is the same name as a variable you are getting ...