I tried setting CXXFLAGS and CMAKE_CXX_FLAGS to -m32 before the
project() call but nothing changed. I could make it fail with
"CXXFLAGS=-m32 cmake -G ..." from command line but this seems wrong. A
minimal CMakeLists.txt example would be nice.
Hendrik Sattler je 29. 10. 2016 ob 15:25 napisal:
You need to set these compiler flags BEFORE the project() call to let CMake
detect all stuff properly. There is a CMake variable telling you the size of a
void*.
Am 29. Oktober 2016 12:22:07 MESZ, schrieb cen <imba...@gmail.com>:
Hi
Once I switch to 32bit builds, CMake fails to recognise that
glibc-devel.i686 is not installed resulting in an error when running
make.
In the same way, my own FindGMP fails to recognize that gmp-devel.i686
is not installed. I need CMake to fail if these things are missing.
At least for the compiler part, I'm pretty sure I am missing some var
or
flag to tell CMake I expect a 32 bit build.
This is what I use to switch between builds in CMakeLists.txt (ARCH var
is irrelevant here, I use it later on for CPack):
if (BUILD_32)
set_target_properties(${PROJECT_NAME} PROPERTIES COMPILE_FLAGS
"-m32" LINK_FLAGS "-m32")
MESSAGE(STATUS "Excluding 64bit library paths from search.")
set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS OFF)
set(ARCH i686)
elseif (BUILD_64)
set_target_properties(${PROJECT_NAME} PROPERTIES COMPILE_FLAGS
"-m64" LINK_FLAGS "-m64")
set(ARCH amd64)
else()
set(ARCH amd64)
endif()
For the FindGMP module, I am not really sure what the best practice
is.Does the BUILD_32 and BUILD_64 flag propagate into the FindGMP? Do I
explicitly specify paths for 32bit libs (eg: /usr/lib64) or can cmake
be smarter than this?
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