RESOLVED FIXED 292343
WebKit code coverage mapping builds are broken with macOS 15.4 SDKs 
https://bugs.webkit.org/show_bug.cgi?id=292343
Summary WebKit code coverage mapping builds are broken with macOS 15.4 SDKs
David Kilzer (:ddkilzer)
Reported 2025-04-30 13:12:36 PDT
WebKit code coverage mapping builds are broken with macOS 15.4 (and aligned) SDKs. In Xcode, setting `CLANG_COVERAGE_MAPPING=YES` or adding these command-line switches: ``` OTHER_CFLAGS = $(inherited) -fprofile-instr-generate -fcoverage-mapping; OTHER_LDFLAGS = $(inherited) -fprofile-instr-generate; ``` Results in an internal compiler error with `set-webkit-configuration --coverage` and then building: ``` fatal error: error in backend: failed to perform tail call elimination on a call site marked musttail ``` The open source clang/llvm fix is here: <https://github.com/llvm/llvm-project/pull/133177>
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Radar WebKit Bug Importer
Comment 1 2025-04-30 13:13:05 PDT
<rdar://problem/150389712>
David Kilzer (:ddkilzer)
Comment 2 2025-04-30 13:51:56 PDT
Pull request: https://github.com/WebKit/WebKit/pull/44761
EWS
Comment 3 2025-04-30 14:39:39 PDT
Committed 294363@main (5a3f0279e17c): <https://commits.webkit.org/294363@main> Reviewed commits have been landed. Closing PR #44761 and removing active labels.
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