[imellag]

What

sceAppContentDownload2Expand (6122c5c) keeps the quota in a std::atomic<std::uint64_t> and reads it into a size_t before compare_exchange_weak(current, size). On macOS size_t is unsigned long and std::uint64_t is unsigned long long, so the expected value cannot bind to the atomic's unsigned long long& and libc++ rejects the call:

core/libs/prx/libSceAppContent/Export.cpp:341:51: error: no matching member function for call to 'compare_exchange_weak'
note: candidate function not viable: no known conversion from 'size_t' (aka 'unsigned long') to 'unsigned long long &' for 1st argument

current now has the atomic's own type. On Linux and Windows both names are the same 64-bit type, so nothing changes there.

Tested

macOS 27.2, Apple M4 Pro, x86-64 Release under Rosetta 2. main doesn't build on macOS on its own, so this was built in the support branch support/macos-boot-1103 merged with main b11c7bf84f (the open macOS port PRs #7631, #7804, #4630, #11437 and local build fixes). Without this commit the full build stops at Export.cpp:341. With it, #15700 and #15756 (two other macOS build stops that reached main today) the full build goes through, and ctest -R '^(guest_appcontent|guest_np_common_rtc|guest_np_common_state_predicates)' passes 9 of 9.

tools/check_conventions.py --base upstream/main passes, and tools/pr_overlap.py finds no overlap.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• Fixes: none
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes