I'm using CMake for a project that comes in two versions, one of which requires -lglapi and the other does not.
So far the lines we used look like that:
SET(CMAKE_C_FLAGS "-O3 -xSSE3 -restrict -lpthread -lX11 -ldrm")
SET(CMAKE_CXX_FLAGS "-O3 -xSSE3 -restrict -lpthread -lX11 -ldrm")
I added an if statement in my CMakeList.txt exactly after those lines:
if(SINGLE_MODE)
SET(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} " -lglapi")
SET(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} " -lglapi")
endif(SINGLE_MODE)
The SINGLE_MODE variable is defined a little up. When I use the message command to display the content of the flag variables it looks alright:
-O3 -xSSE3 -restrict -lpthread -lX11 -ldrm -lglapi
But when I start compiling I am running into a compile error. Using the verbose mode I realized that in the compiler call it looks like that:
-O3 -xSSE3 -restrict -lpthread -lX11 -ldrm; -lglapi
I.e. somehow a semicolon got added before adding the -lglapi to the list.
Did anyone here encounter a similar issue and knows a way to fix this issue? I've googled quite a while and studied the CMake manual but couldn't see what I did wrong here.
Thanks, Tobias
Try to do this instead:
Then, you are sure you append
-lglapi
to the existing${CMAKE_CXX_FLAGS}
string. Else, looks like something like a CMake list is being created.Since CMake 3.4 you do:
This very handy when you want to set the flags only for one language (C++ in the example above), but if you want to set the same flags for all languages, you can simply do:
Both commands change the flags for the whole directory, if you want to set the flags for only one target, do:
Flags on a target can either be PUBLIC, PRIVATE or INTERFACE, allowing to transitively forward the flags from one target to the other.