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Run with `cmake -P <script>` # a string on its own (or with NOT, ... "quoted emptystringvar does not equal the empty string") endif() # as ...

Jul 31, 2012 · I'd like to do a test of the form IF(${CMAKE_SYSTEM_NAME} NOT MATCHES "Linux"). This doesn't appear to work, and the only documentation I can find is a mailing-list post from 2002, which suggests the NOT isn't valid for cmake prior to 1.2. . Is this still the case in later cmake versions, specifically 2.6 and/or 2.8?

if(DEFINED <name>|CACHE{<name>}|ENV{<name>}). True if a variable, cache variable or environment variable with given <name> is defined. The value of the variable does ...

14.02.2013 · Cmake commands do not see these >> quotes. Therefore, STREQUAL can never know the difference between "baz" >> and >> baz. >> >> So, STREQUAL treats a parameter as a variable name if it is defined, but >> as >> a string value if it is not. (I verified this in cmIfCommand.cxx) >> >> Is this quote behavior well

This means that the regular expression ^ab+d$ matches abbd but not ababd, and the regular expression ^(ab|cd)$ matches ab but not abd. CMake language Escape Sequences such as \t, \r, , and \\ may be used to construct literal tabs, carriage returns, newlines, and backslashes (respectively) to pass in a regex. For example:

False if the constant is 0 , OFF , NO , FALSE , N , IGNORE , NOTFOUND , the empty string, or ends in the suffix -NOTFOUND . Named boolean constants are case- ...

Named boolean constants are case-insensitive. If the argument is not one of these specific constants, it is treated as a variable or string and the following ...

And then this still tells me "test" is not the empty string. Which can be considered expected behaviour if an empty variable is not the empty string, but both are "NOT test". Something like QString::null() vs. QString::empty(). You just have to know about it's suptle differences. Eike

CMake offers boolean operator for string comparisons, such as STREQUAL for string equality, and for version comparisons, such as VERSION_EQUAL .

The correct syntax for IF is. IF(NOT <expression>). So in your specific case, you want. IF(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Linux").

CMake compare to empty string with STREQUAL failed (1). You ran into a rather annoying "it's not a bug, it's a feature" behavior of CMake.

Get an element from <json-string> at the location given by the list of <member|index> arguments. Array and object elements will be returned as a JSON string. Boolean elements will be returned as ON or OFF. Null elements will be returned as an empty string. Number and string types will be returned as strings.

30.07.2012 · I'd like to do a test of the form IF(${CMAKE_SYSTEM_NAME} NOT MATCHES "Linux"). This doesn't appear to work, and the only documentation I can find is a mailing-list post from 2002, which suggests the NOT isn't valid for cmake prior to 1.2. . Is this still the case in later cmake versions, specifically 2.6 and/or 2.8?

Please add examples as you find common procedures which are not explained here! Basics. Set a CMake variable. SET(VARIABLE VALUE) ...

08.02.2011 · matches - cmake string not equal CMake compare to empty string with STREQUAL failed (1) I always think that if you want to compare two strings (but not variables) all you need to do is to quote it like that:

May 16, 2014 · # run with `cmake -p ` # a string on its own (or with not, and etc) is *always* expanded # as though it were a variable, whether or not it is defined if ( unsetvar ) message ( fatal_error "unsetvar evaluates to true" ) else () message ( status "unsetvar evaluates to false" ) endif () # !!! unsetvar is *not* expanded with strequal, because it does …

parameters, for the sole purpose of string interpolation and preventing whitespace from splitting a parameter. Cmake commands do not see these quotes. Therefore, STREQUAL can never know the difference between "baz" and baz. So, STREQUAL treats a parameter as a variable name if it is defined, but as a string value if it is not.

1 cmake_minimum_required (VERSION 2.8.12) 2 project(StringFileTest) 3 ... +") 91 if(NOT "${CMAKE_MATCH_0}" STREQUAL "CMake is cool") 92 message(SEND_ERROR ...

CMakeの値はすべて文字列型ですが、この条件式の文脈では以下の値がBoolean ... EQUAL・LESS・GREATERなど. NOT ... <string> MATCHES <regexp>

Feb 08, 2011 · matches - cmake string not equal CMake compare to empty string with STREQUAL failed (1) I always think that if you want to compare two strings (but not variables) all you need to do is to quote it like that:

Evaluates the condition argument of the if clause according to the Condition syntax described below. If the result is true, then the commands in the if block are executed. . Otherwise, optional elseif blocks are processed in the sa

Jan 25, 2022 · Quoting With Bracket Syntax. With CMake 3.0 or later, you can use lua-style bracket syntax instead of surrounding the value with double-quotes. CMake interprets values quoted with bracket syntax literally, so you do not need to escape quotes or backslashes. This makes them very handy for defining regular expressions.