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[libc++] Enable availability based on the compiler instead of __has_extension #84065

Merged
merged 1 commit into from
Mar 7, 2024
Merged

[libc++] Enable availability based on the compiler instead of __has_extension #84065

merged 1 commit into from
Mar 7, 2024

Commits on Mar 5, 2024

  1. [libc++] Enable availability based on the compiler instead of __has_e… 

    …xtension

__has_extension(...) doesn't work as intended when -pedantic-errors is
used with Clang. With that flag, __has_extension(...) is equivalent to
__has_feature(...), which means that checks like

    __has_extension(pragma_clang_attribute_external_declaration)

will return 0. In turn, this has the effect of disabling availability
markup in libc++, which is undesirable.

rdar://124078119
    @ldionne
    ldionne committed Mar 5, 2024
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