gcc's support for __attribute__((noinline)) hasn't been around forever.
authorTom Lane <tgl@sss.pgh.pa.us>
Sat, 14 Oct 2017 19:52:00 +0000 (15:52 -0400)
committerTom Lane <tgl@sss.pgh.pa.us>
Sat, 14 Oct 2017 19:52:00 +0000 (15:52 -0400)
commit82aff8d3369754282114cb0fff92a342b2864e75
tree53f5f91d6f57c0102596d38640047c4dad9c419e
parent4de2d4fba38f4f7aff7f95401eb43a6cd05a6db4
gcc's support for __attribute__((noinline)) hasn't been around forever.

Buildfarm member gaur says it wasn't there in 2.95.3.  Guess that 3.0
and later have it.
src/include/c.h