- if(WIN32)
- if (COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.7")
- # On windows, we need 4.8 or higher to enable lto because of http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50293
- set(optCFLAGS "${optCFLAGS} -flto ")
- endif()
- else()
- # On non-windows, 4.6 is enough for that
- if(COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.5")
- set(optCFLAGS "${optCFLAGS} -flto ")
+ if(CMAKE_COMPILER_IS_GNUCC)
+ if(WIN32)
+ if (COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.7")
+ # On windows, we need 4.8 or higher to enable lto because of http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50293
+ set(optCFLAGS "${optCFLAGS} -flto ")
+ endif()
+ else()
+ # On non-windows, 4.6 is enough for that
+ if(COMPILER_C_VERSION_MAJOR_MINOR STRGREATER "4.5" AND LINKER_VERSION STRGREATER "2.22")
+ set(optCFLAGS "${optCFLAGS} -flto ")
+ endif()