Akim Demaille 01855ca328 warnings: don't use _Noreturn with G++ 4.7 in C++98 mode ...

The timevar and bitset modules now use the c99 module which causes
$CXX to now include -std=gnu++11 when possible.  Unfortunately, G++
4.7 does not implement [[noreturn]] in C++11 mode, so our tests of
glr.cc (which uses _Noreturn) fail with

    input.cc:954:1: error: expected unqualified-id before '[' token

right before [[noreturn]].  4.8 works fine.

* data/skeletons/c.m4 (b4_attribute_define): Do not use [[noreturn]]
with GCC 4.7.

2019-03-23 10:15:11 +01:00

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