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## Add support for thin LTO |
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The `b_lto` option has been updated and now can be set to the value |
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`thin`. This enables [thin |
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LTO](https://clang.llvm.org/docs/ThinLTO.html) on all compilers where |
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it is supported. At the time of writing this means only Clang. |
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This change is potentially backwards incompatible. If you have |
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examined the value of `b_lto` in your build file, note that its type |
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has changed from a boolean to a string. Thus comparisons like this: |
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```meson |
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if get_option('b_lto') |
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... |
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endif |
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``` |
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need to be changed to something like this instead: |
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```meson |
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if get_option('b_lto') == 'true' |
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... |
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endif |
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``` |
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This should not affect any command line invocations as configuring LTO |
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with `-Db_lto=true` still works and behaves the same way as before. |
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