Added in version 3.9.
Check whether the compiler supports an interprocedural optimization (IPO/LTO).
Use this before enabling the INTERPROCEDURAL_OPTIMIZATION target
property.
check_ipo_supported([RESULT <result>] [OUTPUT <output>]
[LANGUAGES <lang>...])
Options are:
RESULT <result>Set <result> variable to YES if IPO is supported by the
compiler and NO 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.
The following languages are supported:
C
CXX
CUDA
Added in version 3.25.
Fortran
If this option is not given, the default languages are picked from
the current ENABLED_LANGUAGES global property.
Note
To use check_ipo_supported(), policy CMP0069 must be set to
NEW; otherwise, a fatal error will occur.
Added in version 3.13: Support for Visual Studio generators.
Added in version 3.24: The check uses the caller's CMAKE_<LANG>_FLAGS
and CMAKE_<LANG>_FLAGS_<CONFIG> values.
See policy CMP0138.
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()