cmake string token inclusion check
In cmake, how can I check if a string token is included in another string?
In my case, I would like to know if the name of the compiler contains the string "Clang" (e.g. "clang", "AppleClang", ...). All I could do so far is:
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
...
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
...
I would like a more flexible approach, like checking for the presence of a substring.
This is what I could find in the documentation:
if( MATCHES regex)
True if the given string or variable’s value matches the given regular expression.
if( LESS )
True if the given string or variable’s value is a valid number and less than that on the right.
if( GREATER )
True if the given string or variable’s value is a valid number and greater than that on the right.
if( EQUAL )
True if the given string or variable’s value is a valid number and equal to that on the right.
if( STRLESS )
True if the given string or variable’s value is lexicographically less than the string or variable on the right.
if( STRGREATER )
True if the given string or variable’s value is lexicographically greater than the string or variable on the right.
if( STREQUAL )
True if the given string or variable’s value is lexicographically equal to the string or variable on the right.
Answer
if(<variable|string> MATCHES regex) will probably be what you're looking for.
In this particular case (assuming you're doing the same thing inside the block for Clang and AppleClang) then you can replace:
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
...
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
...
with:
if(CMAKE_CXX_COMPILER_ID MATCHES "^(Apple)?Clang$")