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meson: Clarify why asm cannot be used in cross compile

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This makes the reasoning for why a cross compile is not using asm
clearer (hopefully).

v2: - fix typos

Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
This commit is contained in:
Dylan Baker 2018-06-07 08:38:07 -07:00
parent f436ae237b
commit c267f46ef2
1 changed files with 17 additions and 7 deletions
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24
meson.build
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@ -841,14 +841,24 @@ endif
# TODO: powr8
# TODO: shared/static? Is this even worth doing?
# Building x86 assembly code requires running x86 binaries. It is possible for
# x86_64 OSes to run x86 binaries, so don't disable asm in those cases
# TODO: it should be possible to use an exe_wrapper to run the binary during
# the build.
# When cross compiling we generally need to turn off the use of assembly,
# because mesa's assembly relies on building an executable for the host system,
# and running it to get information about struct sizes. There is at least one
# case of cross compiling where we can use asm, and that's x86_64 -> x86 when
# host OS == build OS, since in that case the build machine can run the host's
# binaries.
if meson.is_cross_build()
if not (build_machine.cpu_family() == 'x86_64' and host_machine.cpu_family() == 'x86'
and build_machine.system() == host_machine.system())
message('Cross compiling to x86 from non-x86, disabling asm')
if build_machine.system() != host_machine.system()
# TODO: It may be possible to do this with an exe_wrapper (like wine).
message('Cross compiling from one OS to another, disabling assembly.')
with_asm = false
elif not (build_machine.cpu_family() == 'x86_64' and host_machine.cpu_family() == 'x86')
# TODO: There may be other cases where the 64 bit version of the
# architecture can run 32 bit binaries (aarch64 and armv7 for example)
message('''
Cross compiling to different architectures, and the host cannot run
the build machine's binaries. Disabling assembly.
''')
with_asm = false
endif
endif