https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268497
Bug ID: 268497
Summary: clang15 math.h isfinite() generates
unreachable-code-generic-assoc warnings
Product: Base System
Version: 13.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: misc
Assignee: [email protected]
Reporter: [email protected]
This appears to be a variant of #254714 coming back to life with clang15 --
Compiling
int foo(void) { return isfinite(1.0f); }
with
clang15 -c isfinitetest.c -o isfinitetest.o
generates
% clang15 -c isfinitetest.c -o isfinitetest.o
isfinitetest.c:2:24: warning: due to lvalue conversion of the controlling
expression, association of type 'volatile float' will never be selected because
it is qualified [-Wunreachable-code-generic-assoc]
int foo(void) { return isfinite(1.0f); }
^
/usr/include/math.h:110:21: note: expanded from macro 'isfinite'
#define isfinite(x) __fp_type_select(x, __isfinitef, __isfinite, __isfinitel)
^
/usr/include/math.h:85:14: note: expanded from macro '__fp_type_select'
volatile float: f(x), \
^
(and so on for 8 more errors with all combinations of (volatile, const) x
(float, double))
This was not an issue with clang 13, but clang 15 introduced
-Wunreachable-code-generic-assoc and enabled it by default.
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