$ make parser.bc
'/usr/bin/perl' ./check_keywords.pl gram.y ../../../src/include/parser/kwlist.h
/usr/local/bin/bison -Wno-deprecated  -d -o gram.c gram.y
/usr/local/bin/flex -b -CF -p -p -o'scan.c' scan.l
'/usr/bin/perl' ../../../src/tools/fix-old-flex-code.pl 'scan.c'
/usr/lib/llvm-16/bin/clang -Wno-ignored-attributes -fno-strict-aliasing -fwrapv -fexcess-precision=standard -Xclang -no-opaque-pointers -Wno-unused-command-line-argument -Wno-compound-token-split-by-macro -O2  -I. -I. -I../../../src/include -D_GNU_SOURCE  -I/usr/include/libxml2 -I/usr/local/include -flto=thin -emit-llvm -c -o parser.bc parser.c

$ ls
analyze.c          gram.h       Makefile     parse_clause.c   parse_cte.c   parse_func.c   parse_oper.c   parser.c          parse_type.c     scan.c
check_keywords.pl  gramparse.h  meson.build  parse_coerce.c   parse_enr.c   parse_merge.c  parse_param.c  parse_relation.c  parse_utilcmd.c  scan.l
gram.c             gram.y       parse_agg.c  parse_collate.c  parse_expr.c  parse_node.c   parser.bc      parse_target.c    README           scansup.c