[CMake] Errors using CMAKE for cross compiling.

[Kishore]

On Tuesday 14 Jun 2011 9:46:56 AM jianhua wrote:
> Try cross compiling using CMAKE, target tool chain is ARM RVCT4, got errors
> on both Windows and Ubuntu.
> 
> Please help, thanks in advance.
> 
> 1. On Ubuntu.
>  ADD_EXECUTABLE(hello main.c)
> Fatal error: C3900U: Unrecognized option '-rdynamic'.
> 
> ADD_EXECUTABLE(hello SHARED main.c)
> Fatal error: C3900U: Unrecognized option '-fPIC'.
> 
> My question:
> I don't know why such compiling options have been added automatically by
> CMAKE? armcc doesn't recognize it.
> 
> 2. On Windows XP.
> My Question:
> I have set CMAKE_C_COMPILER already, why does it still can't find it?
> 
> G:\t2\build>cmake -G "Unix Makefiles"  VERBOSE=1 .. && make VERBOSE=1
> -- The C compiler identification is unknown
> -- The CXX compiler identification is unknown
> CMake Error: your C compiler: "CMAKE_C_COMPILER-NOTFOUND" was not found.  
> Please set CMAKE_C_COMPILER to a valid compiler path or name. CMake Error:
> your CXX compiler: "CMAKE_CXX_COMPILER-NOTFOUND" was not found.   Please
> set CMAKE_CXX_COMPILER to a valid compiler path or name.
> 
> 
> CMakeLists:
> 
> cmake_minimum_required(VERSION 2.8)
> PROJECT (HELLO)
> 
> set(RVCT40BIN  $ENV{RVCT40BIN})
> set(RVCT40INC  $ENV{RVCT40INC})
> set(RVCT40LIB  $ENV{RVCT40LIB})
> 
> SET (CMAKE_SYSTEM_PROCESSOR arm)
> SET (CMAKE_CROSSCOMPILING 1)
> 
> SET(CMAKE_C_COMPILER  ${RVCT40BIN}/armcc)
> SET(CMAKE_CXX_COMPILER  ${CMAKE_C_COMPILER})

The above cross compiler settings should occur before the PROJECT() statement 
and ideally in a toolchain file. For start, just move the above PROJECT() 
statement to the place of this comment and try again.

> SET (CMAKE_C_FLAGS  "--thumb --cpp -c --cpu ARM9TDMI --apcs
> /noropi/interwork/norwpi --littleend --split_sections   --diag_suppress
> 177,1165,997,611,68,161,2548 --fpu=softvfp -Ospace -O2") SET
> (CMAKE_CXX_FLAGS ${CMAKE_C_FLAGS})
> 
> SET (CMAKE_C_CREATE_STATIC_LIBRARY "<CMAKE_AR> --create -cr <LINK_FLAGS>
> <TARGET> <OBJECTS>") SET (CMAKE_CXX_CREATE_STATIC_LIBRARY "<CMAKE_AR>
> --create -cr <LINK_FLAGS> <TARGET> <OBJECTS>")
> 
> INCLUDE_DIRECTORIES(${RVCT40INC})
> LINK_DIRECTORIES(${RVCT40LIB}/armlib  ${RVCT40LIB}/cpplib)
> ADD_EXECUTABLE(hello main.c)
-- 
Cheers!
Kishore