meson: add -Werror=empty-body to disallow `if(x);`
This would have prevented a bug in MR 2058 [1]; with that MR fixed, nothing else uses empty-body blocks, so let's just forbid them altogether. [1] https://gitlab.freedesktop.org/mesa/mesa/merge_requests/2058#note_237880 Signed-off-by: Eric Engestrom <eric.engestrom@intel.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
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@ -939,6 +939,7 @@ else
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'-Werror=implicit-function-declaration',
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'-Werror=missing-prototypes',
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'-Werror=return-type',
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'-Werror=empty-body',
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'-Werror=incompatible-pointer-types',
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'-Wno-missing-field-initializers',
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'-Wno-format-truncation',
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@ -958,6 +959,7 @@ else
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_trial = [
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'-Werror=return-type',
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'-Werror=empty-body',
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'-Wno-non-virtual-dtor',
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'-Wno-missing-field-initializers',
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'-Wno-format-truncation',
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