CheckIPOSupported¶
Check whether the compiler supports an interprocedural optimization (IPO/LTO).
Use this before enabling the INTERPROCEDURAL_OPTIMIZATION
target
property.
-
check_ipo_supported
¶ check_ipo_supported([RESULT <result>] [OUTPUT <output>] [LANGUAGES <lang>...])
Options are:
RESULT <result>
Set
<result>
variable toYES
if IPO is supported by the compiler andNO
otherwise. If this option is not given then the command will issue a fatal error if IPO is not supported.OUTPUT <output>
Set
<output>
variable with details about any error.LANGUAGES <lang>...
Specify languages whose compilers to check. Languages
C
,CXX
, andFortran
are supported.
It makes no sense to use this module when CMP0069
is set to OLD
so
module will return error in this case. See policy CMP0069
for details.
Examples¶
check_ipo_supported() # fatal error if IPO is not supported
set_property(TARGET foo PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
# Optional IPO. Do not use IPO if it's not supported by compiler.
check_ipo_supported(RESULT result OUTPUT output)
if(result)
set_property(TARGET foo PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
else()
message(WARNING "IPO is not supported: ${output}")
endif()