On Mon, 14 Feb 2022 at 18:56, Philippe Mathieu-Daudé <f4...@amsat.org> wrote: > > Since we already use -Wno-unknown-pragmas, we can also use > -Wno-ignored-pragmas. This silences hundred of warnings using > clang 13 on macOS Monterey: > > [409/771] Compiling C object > tests/fp/libtestfloat.a.p/berkeley-testfloat-3_source_test_az_f128_rx.c.o > ../tests/fp/berkeley-testfloat-3/source/test_az_f128_rx.c:49:14: warning: > '#pragma FENV_ACCESS' is not supported on this target - ignored > [-Wignored-pragmas] > #pragma STDC FENV_ACCESS ON > ^ > 1 warning generated. >
GCC doesn't know about -Wignored-pragmas, so this change is relying on the GCC "ignore a -Wno-something that this gcc doesn't recognize if we wouldn't otherwise be complaining about something" behaviour. I forget which GCC version that was introduced in... (This is why configure has the cc_has_warning_flag() test before it tries to use a warning/warning-suppression option.) -- PMM
