https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108642
--- Comment #4 from David Spickett <david.spickett at linaro dot org> ---
Of course, I was just looking at at assembly output in compiler explorer and
then locally I didn't link the object. That's why it seemed to work.
Compiling and linking I get:
$ ./bin/aarch64-none-linux-gnu-gcc /tmp/test.c -o /tmp/test.o
/tmp/test.c: In function ‘writeStatusWord’:
/tmp/test.c:4:39: warning: implicit declaration of function ‘__arm_wsr’
[-Wimplicit-function-declaration]
4 | void writeStatusWord(uint32_t fpsr) { __arm_wsr("fpsr", fpsr); }
| ^~~~~~~~~
<...>aarch64-none-linux-gnu/bin/ld: /tmp/ccLie8Sh.o: in function
`writeStatusWord':
test.c:(.text+0x18): undefined reference to `__arm_wsr'
collect2: error: ld returned 1 exit status
Which makes more sense.
