On 09/22/2017 04:33 PM, VanCutsem, Geoffroy wrote:
> Hi folks,
>
> One of my team member mentioned that IoTivity 1.3.0 does not build anymore
> for some Linux in 32-bit mode (previous versions such as 1.2.1 built just
> fine). Specifically, when the platform.machine() (see [1]) returns something
> like 'i586' or 'i686', it will simply not build. You can override this by
> forcing TARGET_ARCH to 'x86' but I feel that that shouldn't be needed.
>
> IoTivity 1.2.x had a mechanism in place so that when the 'default_arch' value
> was not in the 'os_arch_map' list (see [2]), then the very first arch from
> the list for that particular OS was selected. It's a bit rough as for Linux
> as an example, any unrecognized ARM, MIPS architecture would make the build
> system attempt to build for 'x86'. My patch [3] below is therefore a slight
> variation of that logic in that it simply detects if 'i586' or 'i686' was
> detected (for Linux) and if so, it replaces that value by 'x86'. Does that
> sound like the right fix to the problem?
>
> [1]
> https://github.com/iotivity/iotivity/blob/master/build_common/SConscript#L68
> [2]
> https://github.com/iotivity/iotivity/blob/1.2-rel/build_common/SConscript#L57
> [3]
> diff --git a/build_common/SConscript b/build_common/SConscript
> index 46a6735..61c5889 100755
> --- a/build_common/SConscript
> +++ b/build_common/SConscript
> @@ -55,6 +55,9 @@ else:
> default_arch = platform.machine()
> if target_os == 'windows':
> default_arch = default_arch.lower()
> + if target_os == 'linux':
> + if default_arch in ['i586', 'i686']:
> + default_arch = 'x86'
>
> target_arch = ARGUMENTS.get('TARGET_ARCH', default_arch) # target arch
I fired up a 32-bit Ubuntu 16.04 to try this, and there's more
trouble... if you try to build with this change, the system thinks
cross-compilation is happening. Two scripts have this logic:
if not target_arch == platform.machine():
print '''
*********************************** Warning
**********************************
* You are trying cross build, please make sure cross (%s) libraries are
* installed!
******************************************************************************
''' % target_arch
while that's not a fail as written, just an output message, about the
first thing tried - building googletest - fails. I'll try to get to the
bottom of it later, I'm being told I'm supposed to go have a weekend :)
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