amd64 builds OK:
Full build log:
https://launchpadlibrarian.net/214693325/buildlog_ubuntu-vivid-amd64.libdrm_2.4.63%2Bgit1508171138.f05a74~gd~v_BUILDING.txt.gz

Same source package breaks with i386:
In file included from ../../../amdgpu/amdgpu_internal.h:35:0,
                 from ../../../tests/amdgpu/cs_tests.c:32:
../../../libdrm_macros.h: In function 'drm_munmap':
../../../libdrm_macros.h:79:4: error: size of unnamed array is negative
    STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
    ^
Full i386 build log:
https://launchpadlibrarian.net/214693090/buildlog_ubuntu-vivid-i386.libdrm_2.4.63%2Bgit1508171138.f05a74~gd~v_BUILDING.txt.gz

Bug ID	91666
Summary	build fail with cunit - OK on amd64 - KO for i386
Product	DRI
Version	DRI git
Hardware	x86 (IA32)
OS	Linux (All)
Status	NEW
Severity	normal
Priority	medium
Component	libdrm
Assignee	dri-devel@lists.freedesktop.org
Reporter	fabio.ped@libero.it