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Hi guys

Here is the steps I build ArduCopter-3.2 version:

1. git clone 3 databases

https://github.com/diydrones/ardupilot.git

https://github.com/diydrones/PX4Firmware.git

https://github.com/diydrones/PX4Nuttx.git

2. each datebase checkout to ArduCopter-3.2 branch

#git checkout  ArduCopter-3.2

3. In scketch sources generare config.mk

#cd ArduCopter

#make configure

3. modify  config.mk with correct PX4Firmware PX4Nuttx path

4. cd ArduCopter

5. make px4

But build failed in nuttx source building with follow info(unknown type name '_LONG_LONG_TYPE'):

I belive 3.2 is a mature version, some problem with me?

In file included from /home/xuming/uav/ardupilot.3.2/PX4NuttX/nuttx/include/math.h:52:0,
                 from ./stdio/lib_libdtoa.c:47,
                 from stdio/lib_libvsprintf.c:230:
/home/xuming/uav/ardupilot.3.2/PX4NuttX/nuttx/include/arch/math.h:257:24: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
 extern _LONG_LONG_TYPE int llrint _PARAMS((double));
                        ^
/home/xuming/uav/ardupilot.3.2/PX4NuttX/nuttx/include/arch/math.h:327:8: error: unknown type name '_LONG_LONG_TYPE'
 extern _LONG_LONG_TYPE llrintf _PARAMS((float));
        ^
/home/xuming/uav/ardupilot.3.2/PX4NuttX/nuttx/include/arch/math.h:420:24: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
 extern _LONG_LONG_TYPE int llroundl _PARAMS((long double));
                        ^
In file included from stdio/lib_libvsprintf.c:230:0:
./stdio/lib_libdtoa.c: In function 'lib_dtoa':
./stdio/lib_libdtoa.c:207:13: warning: comparing floating point with == or != is unsafe [-Wfloat-equal]
   if (value == 0 || expt < -prec)
             ^
./stdio/lib_libdtoa.c:153:13: warning: variable 'digalloc' set but not used [-Wunused-but-set-variable]
   FAR char *digalloc;   /* Copy of digits to be freed after usage */
             ^
make[3]: *** [bin/lib_libvsprintf.o] Error 1
make[2]: *** [libc/libc.a] Error 2
make[1]: *** [/home/xuming/uav/ardupilot.3.2/PX4Firmware/Archives/px4fmu-v1.export] Error 2
make[1]: Leaving directory `/home/xuming/uav/ardupilot.3.2/PX4Firmware'
make: *** [../PX4Firmware/Archives/px4fmu-v1.export] Error 2
xuming@xuming-ubuntu:~/uav/ardupilot.3.2/ArduCopter$

read any object file elf info:

xuming@xuming-ubuntu:~/uav/ardupilot.3.2/PX4NuttX/nuttx$ readelf -Wa ./libc/bin/lib_printf.o

No version information found in this file.
Attribute Section: aeabi
File Attributes
  Tag_CPU_name: "Cortex-M4"
  Tag_CPU_arch: v7E-M
  Tag_CPU_arch_profile: Microcontroller
  Tag_THUMB_ISA_use: Thumb-2
  Tag_FP_arch: VFPv4-D16
  Tag_ABI_PCS_wchar_t: 4
  Tag_ABI_FP_number_model: IEEE 754
  Tag_ABI_align_needed: 8-byte
  Tag_ABI_align_preserved: 8-byte, except leaf SP
  Tag_ABI_enum_size: small
  Tag_ABI_HardFP_use: SP only
  Tag_ABI_VFP_args: VFP registers
  Tag_ABI_optimization_goals: Aggressive Size
  Tag_CPU_unaligned_access: v6