Without the change build fails as:
In file included from /<<NIX>>/gcc-14.0.0/include/c++/14.0.0/limits:42,
from <stdin>:1:
/<<NIX>>/gcc-14.0.0/include/c++/14.0.0/x86_64-unknown-linux-gnu/bits/c++config.h:668:2: warning: #warning "__STRICT_ANSI__ seems to have been undefined; this is not supported" [-Wcpp]
668 | #warning "__STRICT_ANSI__ seems to have been undefined; this is not supported"
| ^~~~~~~
/<<NIX>>/gcc-14.0.0/include/c++/14.0.0/limits:2100:30: error: exponent has no digits
2100 | return __extension__ 0x1.0p-16382Q;
| ^~~~~~
/<<NIX>>/gcc-14.0.0/include/c++/14.0.0/limits:2114:30: error: exponent has no digits
2114 | return __extension__ 0x1.ffffffffffffffffffffffffffffp+16383Q;
gcc upstream confirms unsetting __STRICT_ANSI__ is an unsupported
configuration: https://gcc.gnu.org/PR111824
b9a38bf4f2