gh-129141: Fix build on gcc-9.4.0 #129142
Merged
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d3b1bb2 introduced the line:
Unfortunately this doesn't work on compilers that don't have
__has_builtin
, because the parser fails on the usage of__has_builtin(__builtin_available)
before is has a change to run the testdefined(__has_builtin)
. Separating thedefined
check to its own expression seems to resolve this.