[Forumkel]

Hi, I wonder if I'm the only one who wants to cross compile pilight to speed things up ;-)
Anyway, this is what I've got so far:

• installed cross compilers (aptitude install gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf)
  
• created toolchain root (mkdir /opt/arm-toolchain ; sudo chown bla /opt/arm-toolchain)
  
• downloaded libpcap and libunwind and cross-compiled those (CC=arm-linux-gnueabihf-gcc ./configure --prefix=/opt/arm-toolchain --host=arm-linux)
  
• after "make install" both libs where installed to /opt/arm-toolchain
  
• downloaded pilight stable sources (git clone --depth 5 -b master https://github.com/pilight/pilight.git)
  
• created a arm-toolchain.cmake file (contents below)
  
• tried to compile pilight (cmake -DCMAKE_TOOLCHAIN_FILE=/path/to/arm-toolchain.cmake ; make)
  

My "arm-toolchain.cmake" looks like this:

Code:

# this one is important
SET(CMAKE_SYSTEM_NAME Linux)
# this one not so much
SET(CMAKE_SYSTEM_VERSION 1)

# specify the cross compiler
SET(CMAKE_C_COMPILER   arm-linux-gnueabihf-gcc)
SET(CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++)

# where is the target environment
SET(CMAKE_FIND_ROOT_PATH  /opt/arm-toolchain)
SET(CROSS_COMPILE_LIBS  /opt/arm-toolchain/lib)
include_directories(SYSTEM /opt/arm-toolchain/include)

# https://tls.mbed.org/kb/development/arm-thumb-error-r7-cannot-be-used-in-asm-here
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fomit-frame-pointer")
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fomit-frame-pointer")

# search for programs in the build host directories
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# for libraries and headers in the target directories
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

Compiling works until it gets to pilight-daemon:

Code:

[ 96%] Building C object CMakeFiles/pilight-daemon.dir/daemon.c.o
/var/tmp/pilight/daemon.c: In function ‘start_pilight’:
/var/tmp/pilight/daemon.c:2168:3: warning: format not a string literal and no format arguments [-Wformat-security]
   printf(help);
   ^
libpilight.a(gc.c.o): In Funktion `gc_handler':
/var/tmp/pilight/libs/pilight/core/gc.c:71: undefined reference to `_ULarm_init_local'
/var/tmp/pilight/libs/pilight/core/gc.c:75: undefined reference to `_ULarm_get_proc_name'
/var/tmp/pilight/libs/pilight/core/gc.c:76: undefined reference to `_ULarm_get_reg'
/var/tmp/pilight/libs/pilight/core/gc.c:77: undefined reference to `_ULarm_get_reg'
/var/tmp/pilight/libs/pilight/core/gc.c:73: undefined reference to `_ULarm_step'
collect2: error: ld returned 1 exit status

Any suggestions?

[curlymo]

You are missing a cross-compiled libunwind.

[Forumkel]

No, that was a typo in my post - I wrote "libunwrap" but I meant "libunwind" ;-)
So the cross-compiled libunwind exists in the toolchains lib path. Otherwise cmake would complain about missing libs anyway.

[curlymo]

You need to make sure it gets linked. The functions are definitely libunwind functions.

[Forumkel]

cmake didn't include it in the makefiles because of this line in "CMakeLists.txt":
[227] if(NOT ${CMAKE_SYSTEM_PROCESSOR} MATCHES "^mips")
after commenting it out it worked.