Hi!
Since the switch to -std=gnu23 by default, float.h (included from
tsystem.h) defines INFINITY macro (to __builtin_inff ()), which now
results in a warning when compiling libgcc2.c which defines it
to something else (and, worse aarch64 compiles it with -Werror and
build fails).
libgcc2.c asserts INFINITY has the expected type which depends on
the macros with which libgcc2.c is being compiled, so guarding
the define with #ifndef INFINITY wouldn't work.
So this patch instead #undefs the macro before defining it.
I've committed this as obvious to unbreak things, if somebody has
better ideas what to do, it can be tweaked incrementally.
2024-11-16 Jakub Jelinek <ja...@redhat.com>
PR libgcc/117624
* libgcc2.c (INFINITY): Add #undef before #define.
--- libgcc/libgcc2.c.jj 2024-04-19 08:44:48.210621580 +0200
+++ libgcc/libgcc2.c 2024-11-16 17:03:18.709319513 +0100
@@ -2673,6 +2673,7 @@ NAME (TYPE x, int m)
#define isfinite(x) __builtin_isfinite (x)
#define isinf(x) __builtin_isinf (x)
+#undef INFINITY
#define INFINITY CONCAT2(__builtin_huge_val, CEXT) ()
#define I 1i
Jakub
