[Debugging] Use __TEXT segment for DebugDescription macro #71639
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There are no fixups in the summar records, which makes `__TEXT` a more appropriate segment.
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adrian-prantl
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Feb 16, 2024
kastiglione
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Feb 21, 2024
Introduces the first use of `@_DebugDescription` in the standard library, applying it to `ObjectIdentifier`. In order to use the DebugDescription macro in the stdlib, the following changes are required: 1. Compilation must reference the just built macros (ie `libSwiftMacros.dylib`), not those from the SDK. This is addressed by adding an explicit `-external-plugin-path` flag that overrides the defaults generated by the compiler (which uses SDK paths, where the macro may or may not exist, and may not be the current version). 2. As DebugDescription uses `@_section`, compilation enables the `SymbolLinkageMarkers` feature. Note that the use of DebugDescription is conditionally enabled for the following reasons: 1. Use is disabled in freestanding builds, where the stdlib macros are not built. 2. Use is temporarily disabled in Linux builds due to a dynamic loader issue that needs further investigation The dynamic loader error causing issues with Linux CI is: > swift-plugin-server: error while loading shared libraries: libswiftGlibc.so: cannot open shared object file: No such file or directory This PR depended on #71639, #71588, and #71685.
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The data emitted by
DebugDescriptionMacrois constant. For that reason, it was placed in__DATA_CONST. However, this causes a problem with the linker, which emits an error if the__DATA_CONSTsegment is not markedSG_READ_ONLY.After discussion, it was pointed out that if the constant data has no fixups, then it can and should be in the the
__TEXTsegment. The__DATA_CONSTsegment is for data that is essentially constant but contains dyld fixups.