CODEWITHSUNDEEP
c++gcclinkercmake
amigo421
amigo421

Reputation: 2541

undefined references in GCC6 to 'rt','pthread','stdc++fs'

just faced with a GCC on ubuntu when was trying to build my sample project, found those three libraries (from subject) required to link. and also found that order of '-lxxx' parameters is important in a commandline

however I'm using cmake as a build system and could find this applying to cmake.

currently this is :

if (${GCC})
     target_link_libraries(${PROJECT_NAME} rt pthread stdc++fs)
endif (${GCC})

and it doesn't work for me, linker still can't find referred symbols from all referred libs.

could someone help with this libraries linkage from cmake perspective?

Upvotes: 2

Views: 1112

Answers (1)

OMGtechy
OMGtechy

Reputation: 8260

As it stands, your conditions is always false (the variable doesn't exist AFAIK), so the statements inside of it are never taken into account!

You need to change:

if(${GCC})

To:

if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")

Or:

if(CMAKE_COMPILER_IS_GNUCXX)

This now checks if the C++ compiler is gcc/g++.

Upvotes: 4

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