tin_alloca(x)
BUILDSTDERR:       |                                      ^
BUILDSTDERR: ../../gcc-7.4.0/gcc/../include/libiberty.h:727:47: note: in expansion of macro 'alloca'
BUILDSTDERR:   727 |    char *const libiberty_nptr = (char *const) alloca (libiberty_len); \
BUILDSTDERR:       |                                               ^~~~~~
BUILDSTDERR: ../../gcc-7.4.0/gcc/genmatch.c:4951:17: note: in expansion of macro 'ASTRDUP'
BUILDSTDERR:  4951 |     dir->name = ASTRDUP (".");
BUILDSTDERR:       |                 ^~~~~~~
BUILDSTDERR: In file included from ../../gcc-7.4.0/gcc/hash-table.h:236,
BUILDSTDERR:                  from ../../gcc-7.4.0/gcc/genmatch.c:29:
BUILDSTDERR: ../../gcc-7.4.0/gcc/vec.h: In instantiation of 'bool vec<T, va_heap, vl_ptr>::reserve(unsigned int, bool) [with T = std::pair<user_id*, id_base*>]':
BUILDSTDERR: ../../gcc-7.4.0/gcc/vec.h:1465:10:   required from 'bool vec<T, va_heap, vl_ptr>::reserve_exact(unsigned int) [with T = std::pair<user_id*, id_base*>]'
BUILDSTDERR: ../../gcc-7.4.0/gcc/vec.h:1528:7:   required from 'void vec<T, va_heap, vl_ptr>::safe_splice(const vec<T, va_heap, vl_ptr>&) [with T = std::pair<user_id*, id_base*>]'
BUILDSTDERR: ../../gcc-7.4.0/gcc/genmatch.c:1457:55:   required from here
BUILDSTDERR: ../../gcc-7.4.0/gcc/vec.h:1448:14: warning: 'void* memcpy(void*, const void*, size_t)' writing to an object of type 'struct std::pair<user_id*, id_base*>' with no trivial copy-assignment; use copy-assignment or copy-initialization instead [-Wclass-memaccess]
BUILDSTDERR:  1448 |       memcpy (m_vec->address (), oldvec->address (), sizeof (T) * oldsize);
BUILDSTDERR:       |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BUILDSTDERR: In file included from /usr/include/c++/9/utility:70,
BUILDSTDERR:                  from ../../gcc-7.4.0/gcc/system.h:237,
BUILDSTDERR:                  from ../../gcc-7.4.0/gcc/genmatch.c:25:
BUILDSTDERR: /usr/include/c++/9/bits/stl_pair.h:208:12: note: 'struct std::pair<user_id*, id_base*>' declared here
BUILDSTDERR:   208 |     struct pair
BUILDSTDERR:       |            ^~~~
BUILDSTDERR: In file included from ../../gcc-7.4.0/gcc/hash-table.h:236,
BUILDSTDERR:                  from ../../gcc-7.4.0/gcc/genmatch.c:29:
BUILDSTDERR: ../../gcc-7.4.0/gcc/vec.h: In instantiation of 'void vec<T, A, vl_embed>::splice(const vec<T, A, vl_embed>&) [with T = std::pair<user_id*, id_base*>; A = va_heap]':
BUILDSTDERR: ../../gcc-7.4.0/gcc/vec.h:1512:5:   required from 'void vec<T, va_heap, vl_ptr>::splice(const vec<T, va_heap, vl_ptr>&) [with T = std::pair<user_id*, id_base*>]'
BUILDSTDERR: ../../gcc-7.4.0/gcc/vec.h:1529:7:   required from 'void vec<T, va_heap, vl_ptr>::safe_splice(const vec<T, va_heap, vl_ptr>&) [with T = std::pair<user_id*, id_base*>]'
BUILDSTDERR: ../../gcc-7.4.0/gcc/genmatch.c:1457:55:   required from here
BUILDSTDERR: ../../gcc-7.4.0/gcc/vec.h:841:14: warning: 'void* memcpy(void*, const void*, size_t)' writing to an object of type 'struct std::pair<user_id*, id_base*>' with no trivial copy-assignment; use copy-assignment or copy-initialization instead [-Wclass-memaccess]
BUILDSTDERR:   841 |       memcpy (address () + length (), src.address (), len * sizeof (T));
BUILDSTDERR:       |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BUILDSTDERR: In file included from /usr/include/c++/9/utility:70,
BUILDSTDERR:                  from ../../gcc-7.4.0/gcc/system.h:237,
BUILDSTDERR:                  from ../../gcc-7.4.0/gcc/genmatch.c:25:
BUILDSTDERR: /usr/include/c++/9/bits/stl_pair.h:208:12: note: 'struct std::pair<user_id*, id_base*>' declared here
BUILDSTDERR:   208 |     struct pair
BUILDSTDERR:       |            ^~~~
BUILDSTDERR: GIMPLE decision tree has 1882 leafs, maximum depth 12 and a total number of 7473 nodes
BUILDSTDERR: removed 1100 duplicate tails
BUILDSTDERR: GENERIC decision tree has 1840 leafs, maximum depth 12 and a total number of 7247 nodes
BUILDSTDERR: removed 1061 duplicate tails