Hi,
I have browsed the list for a while trying to figure this but with
little success and my own testing is yielding confusing results.
I am using the following test case in an attempt to add a custom
command to build an assembly file. The assembly file should be
compiled with the C++ compiler driver (which in turn should invoke the
assembler after pre-processing), and I am building up a
CMAKE_CXX_FLAGS variable from separate pieces:
# -*- CMake -*-
cmake_minimum_required(VERSION 2.6)
project(test)
set(CMAKE_VERBOSE_MAKEFILE ON)
set(CMAKE_CXX_FLAGS -m32)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
message (STATUS "CMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}")
file (GLOB ASM_SRCS bar.S)
foreach (src ${ASM_SRCS})
get_filename_component (FILE_BASE ${src} NAME_WE)
set (SRC ${src})
set (OBJ ${CMAKE_CURRENT_BINARY_DIR}/${FILE_BASE}.o)
add_custom_command (OUTPUT ${OBJ}
MAIN_DEPENDENCY ${SRC}
COMMAND ${CMAKE_CXX_COMPILER}
ARGS ${CMAKE_CXX_FLAGS} -o ${OBJ} -c ${SRC}
MAIN_DEPENDENCY ${src})
set (ASM_OBJS ${ASM_OBJS} ${OBJ})
endforeach(src)
add_library(test SHARED foo.cpp bar.S)
The above gives this:
[...]
[ 50%] Generating bar.o
/usr/bin/c++ -m32\ -pthread -o /tmp/build-test/bar.o -c /tmp/test/bar.S
cc1: error: unrecognized command line option "-m32 -pthread"
[...]
I see that the space separating the two options is escaped, I assume
as a result of defining the variable as a string. However, in this:
$ nice make foo.o
[...]
[100%] Building CXX object CMakeFiles/test.dir/foo.cpp.o
/usr/bin/c++ -Dtest_EXPORTS -m32 -pthread -fPIC -o CMakeFiles/
test.dir/foo.cpp.o -c /tmp/test/foo.cpp
CMAKE_CXX_FLAGS appears fine in this rule. I assume it is processed
differently when this rule is generated.
My question is: how should I go about hard-coding my rule? I need to
pass the language-specific flags as well as the include directories
(same with which I compile all C++ sources in the project).
Thanks for the help.
_______________________________________________
Powered by www.kitware.com
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Follow this link to subscribe/unsubscribe:
http://www.cmake.org/mailman/listinfo/cmake
