Forum: help

Mac build problem, "-single_module" flag [ Reply ]
By: Dan Stowell on 2012-02-09 15:24

Hi -

Compiling on Mac 10.4.11 (intel) is failing here. All dependencies installed, cmake configures happily, then "make" results in a fail after building the first item:

Linking CXX executable ../../bin/make_regression_constants
/usr/bin/ld: -single_module or -multi_module flags can only be used when -dylib is also specified
collect2: ld returned 1 exit status

Now, the reason seems to be this line in the ./CMakeLists.txt:

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -single_module -headerpad_max_install_names ${COVERAGE_LIB}")

I suspect that "-single_module" should be a linker flag not a CXX flag. (CMAKE_MODULE_LINKER_FLAGS perhaps?)

But I'm not 100% sure how to proceed. I tried this:

--- ../CMakeLists.orig.txt 2012-02-09 15:24:56.000000000 +0000
+++ ../CMakeLists.txt 2012-02-09 15:25:07.000000000 +0000
@@ -104,7 +104,12 @@
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC -single_module -headerpad_max_install_names ${COVERAGE_LIB}")
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
ELSE(CMAKE_SYSTEM_PROCESSOR STREQUAL "ia64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
- SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -single_module -headerpad_max_install_names ${COVERAGE_LIB}")
+
+ SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -headerpad_max_install_names ${COVERAGE_LIB}")
+ SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS} -single_module")
+ SET(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS} -single_module")
+
+
ENDIF(CMAKE_SYSTEM_PROCESSOR STREQUAL "ia64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
ELSE(APPLE)
IF(CMAKE_SYSTEM_PROCESSOR STREQUAL "ia64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")

This goes a long way towards compiling things, but eventually errors out with:

[ 79%] Built target getopt
Linking CXX executable ../../bin/cmpd
/usr/bin/ld: multiple definitions of symbol _getopt
/usr/lib//libdl.dylib(getopt.So) definition of _getopt
../../lib/liblibgetopt.a(getopt.o) definition of _getopt in section (__TEXT,__text)
/usr/bin/ld: multiple definitions of symbol _opterr
/usr/lib//libdl.dylib(getopt.So) definition of _opterr
../../lib/liblibgetopt.a(getopt.o) definition of _opterr in section (__DATA,__data)
/usr/bin/ld: multiple definitions of symbol _optind
/usr/lib//libdl.dylib(getopt.So) definition of _optind
../../lib/liblibgetopt.a(getopt.o) definition of _optind in section (__DATA,__data)
/usr/bin/ld: multiple definitions of symbol _optopt
/usr/lib//libdl.dylib(getopt.So) definition of _optopt
../../lib/liblibgetopt.a(getopt.o) definition of _optopt in section (__DATA,__data)
collect2: ld returned 1 exit status
make[2]: *** [bin/cmpd] Error 1

This multiple definition problem is probably what the single_module option prevents - so what is the proper way to set this up?

Any suggestions gratefully received.

Best
Dan