• Peter Senna Tschudin's avatar
    tools: usb: ffs-test: Fix build on big endian systems · 3b7c96a9
    Peter Senna Tschudin authored
    [ Upstream commit a2b22dddc7bb6110ac3b5ed1a60aa9279836fadb ]
    
    The tools/usb/ffs-test.c file defines cpu_to_le16/32 by using the C
    library htole16/32 function calls. However, cpu_to_le16/32 are used when
    initializing structures, i.e in a context where a function call is not
    allowed.
    
    It works fine on little endian systems because htole16/32 are defined by
    the C library as no-ops. But on big-endian systems, they are actually
    doing something, which might involve calling a function, causing build
    failures, such as:
    
       ffs-test.c:48:25: error: initializer element is not constant
        #define cpu_to_le32(x)  htole32(x)
                                ^~~~~~~
       ffs-test.c:128:12: note: in expansion of macro ‘cpu_to_le32’
          .magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
                   ^~~~~~~~~~~
    
    To solve this, we code cpu_to_le16/32 in a way that allows them to be
    used when initializing structures. This fix was imported from
    meta-openembedded/android-tools/fix-big-endian-build.patch written by
    Thomas Petazzoni <thomas.petazzoni@free-electrons.com>.
    
    CC: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
    Signed-off-by: default avatarPeter Senna Tschudin <peter.senna@gmail.com>
    Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
    Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    3b7c96a9
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