https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121718
Bug ID: 121718
Summary: [16 Regression] _Decimal128 now requires -lm, fails to
link gdb (mpfr is underlinked against fesetenv())
since r16-3448-g50064b2898edfb
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgcc
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at gcc dot gnu.org
Target Milestone: ---
Noticed the problem as `gdb` ./configure failure to locate gmp/mpfr.
Minimal reproducer:
// $ cat a.c
_Decimal128 d(_Decimal128 a, _Decimal128 b) { return a / b; }
$ gcc a.c -o liba.so -fPIC -shared -Wl,--no-undefined
ld: libgcc.a(bid128_div.o): in function `__bid128_div':
(.text+0x1c1c): undefined reference to `fegetround'
ld: (.text+0x1eb3): undefined reference to `fesetround'
I suspect a new dependency is an effect of r16-3448-g50064b2898edfb "Fix
_Decimal128 arithmetic error under FE_UPWARD.".
Should `gcc` start implicitly providing `-lm` along with `libgcc`?
