[BUGS] base_yylex undefined in src/interface/ecpg/preproc/parser.c

Hello,

with the newest flex (v2.6.2-19-g6bea32e, which is newer than 2.6.3) I 
need this patch to compile postgres:

diff --git a/src/interfaces/ecpg/preproc/pgc.l 
b/src/interfaces/ecpg/preproc/pgc.l
index 0453409d37..1c82b58e18 100644
--- a/src/interfaces/ecpg/preproc/pgc.l
+++ b/src/interfaces/ecpg/preproc/pgc.l
@@ -30,7 +30,7 @@ static int            xcdepth = 0;    /* depth of 
nesting in slash-star comments */
  static char       *dolqstart = NULL;   /* current $foo$ quote start 
string */
  static YY_BUFFER_STATE scanbufhandle;
  static char *scanbuf;
-
+#define yylex base_yylex
  /*
   * literalbuf is used to accumulate literal values when multiple rules
   * are needed to parse a single literal.  Call startlit to reset buffer


otherwise the linker fails with:

gcc -Wall -Wmissing-prototypes -Wpointer-arith 
-Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute 
-Wformat-security -fno-strict-aliasing -fwrapv 
-fexcess-precision=standard -g -O0 -pthread  -D_REENTRANT -D_THREAD_SAFE 
-D_POSIX_PTHREAD_SEMANTICS -DECPG_COMPILE -L../../../../src/port 
-L../../../../src/common -L/usr/local/lib -L/usr/local/lib 
-L/usr/local/lib  -Wl,--as-needed 
-Wl,-rpath,'/usr/local/lib',--enable-new-dtags  preproc.o type.o ecpg.o 
output.o parser.o keywords.o c_keywords.o ecpg_keywords.o kwlookup.o 
../ecpglib/typename.o descriptor.o variable.o -lpgcommon -lpgport -lxslt 
-lxml2 -lssl -lcrypto -lgssapi_krb5 -lz -lreadline -lrt -lcrypt -ldl -lm 
  -lpthread    -o ecpg
parser.o: In function `filtered_base_yylex':
/git/postgresql/src/interfaces/ecpg/preproc/parser.c:68: undefined 
reference to `base_yylex'
/git/postgresql/src/interfaces/ecpg/preproc/parser.c:105: undefined 
reference to `base_yylex'
collect2: error: ld returned 1 exit status
make: *** [Makefile:42: ecpg] Error 1

because of ecpg/preproc/parser.c:68 (in REL9_5_STABLE)

With previous versions of flex the compilation has worked.  But I do not 
find in the code where is supposed yylex to be renamed to base_yylex 
when parser.c is proccessed.  pgc.l also does not use %option 
prefix=base_yy, which would be the right way to rename yylex (apart from 
#define YY_DECL).

What is the purpose to rename yylex to base_yylex?

Greetings
   Дилян


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