[SR-7426] Segmentation fault when building with -Osize #49969
Labels
bug
A deviation from expected or documented behavior. Also: expected but undesirable behavior.
compiler crash
A crash that happens during compilation
compiler
The Swift compiler in itself
crash
Any kind of crash
optimized only
Environment
Xcode 9.3, Swift 4.1
Swift 4.2 master (5ea4848)
Additional Detail from JIRA
md5: 9dfe97cde2c14b3c4990b74e565d74af
Issue Description:
Compiling the code below with -Osize should trigger a segfault (or assertion failure). It can be worked around by forcing the type of "resource" to be Optional.
I tried to dig in to the code for this. As far as I could see the error occurs in the Outliner pass in -Osize, where ti's is creating an outline for the Obj-C method call for bundle.path(forResource:ofType🙂 . Both of its parameters take Optional<String> (or Optional<NSString>) but it generates a non-optional String parameter type and it causes a type mismatch.
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