编译报错

**Is this a BUG REPORT or FEATURE REQUEST?**:

> Uncomment only one, leave it on its own line: 
>
> - bug
>
> - feature

**What happened**:
系统：openEuler release 20.03 (LTS-SP1)
三方件用的是官网编译好的。
编译指令：
./configure --gcc-version=7.3.0 CC=g++ CFLAGS='-O0' --prefix=$GAUSSHOME --3rd=$BINARYLIBS --enable-debug --enable-cassert --enable-thread-safety --without-readline --without-zlib
make -sj 4

编译报错：
[shift@08-00-27-B4-FE-77 openGauss-server]$ make -sj 1
Writing fmgroids.h
Writing fmgrtab.cpp
Writing pg_builtin_proc.h
cat: snowball/objfiles.txt: 没有那个文件或目录
-I../../../../src/include -I../../../../src/lib/gstrace -D_GNU_SOURCE  -I/home/shift/opengauss_source/binarylibs/dependency/install_tools_openeuler_x86_64/unixodbc/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/libobs/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/libcgroup/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/openssl/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/liborc/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/libparquet/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/protobuf/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/grpc/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/boost/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/llvm/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/kerberos/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/postgresql-hll/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/cjson/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/libedit/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/numactl/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/zlib1.2.11/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/lz4/comm/include -I/home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/libcurl/comm/include
bufmgr.cpp: In function ‘Buffer ReadBuffer_common(SMgrRelation, char, ForkNumber, BlockNumber, ReadBufferMode, BufferAccessStrategy, bool*)’:
bufmgr.cpp:2164:10: warning: unused variable ‘block_exist’ [-Wunused-variable]
     bool block_exist = true;
          ^~~~~~~~~~~
cat: ../../src/common/interfaces/libpq/objfiles.txt: 没有那个文件或目录
cat: ../../contrib/test_decoding/objfiles.txt: 没有那个文件或目录
cat: ../../contrib/mppdb_decoding/objfiles.txt: 没有那个文件或目录
cat: ../../contrib/postgres_fdw/objfiles.txt: 没有那个文件或目录
cat: ../../src/common/interfaces/libpq/objfiles.txt: 没有那个文件或目录
cat: ../../contrib/test_decoding/objfiles.txt: 没有那个文件或目录
cat: ../../contrib/mppdb_decoding/objfiles.txt: 没有那个文件或目录
cat: ../../contrib/postgres_fdw/objfiles.txt: 没有那个文件或目录
ld: warning: libsecurec.so, needed by /home/shift/opengauss_source/binarylibs/dependency/openeuler_x86_64/libobs/comm/lib/libeSDKOBS.so, not found (try using -rpath or -rpath-link)
ld: ../../src/common/backend/parser/parser.o: in function `base_yylex(YYSTYPE*, int*, void*)':
/home/shift/opengauss_source/openGauss-server/src/common/backend/parser/parser.cpp:134: undefined reference to `core_yylex(core_YYSTYPE*, int*, void*)'
ld: /home/shift/opengauss_source/openGauss-server/src/common/backend/parser/parser.cpp:143: undefined reference to `core_yylex(core_YYSTYPE*, int*, void*)'
ld: /home/shift/opengauss_source/openGauss-server/src/common/backend/parser/parser.cpp:166: undefined reference to `core_yylex(core_YYSTYPE*, int*, void*)'
ld: /home/shift/opengauss_source/openGauss-server/src/common/backend/parser/parser.cpp:187: undefined reference to `core_yylex(core_YYSTYPE*, int*, void*)'
ld: /home/shift/opengauss_source/openGauss-server/src/common/backend/parser/parser.cpp:209: undefined reference to `core_yylex(core_YYSTYPE*, int*, void*)'
ld: ../../src/common/backend/parser/parser.o:/home/shift/opengauss_source/openGauss-server/src/common/backend/parser/parser.cpp:231: more undefined references to `core_yylex(core_YYSTYPE*, int*, void*)' follow
ld: ../../src/gausskernel/storage/replication/repl_gram.o: in function `replication_yylex(YYSTYPE*, int*, void*)':
/home/shift/opengauss_source/openGauss-server/src/gausskernel/storage/replication/repl_gram.y:419: undefined reference to `replication_scanner_yylex(replication_scanner_YYSTYPE*, int*, void*)'
ld: ../../src/gausskernel/storage/replication/syncrep.o: in function `syncrep_yylex(YYSTYPE*, int*, void*)':
/home/shift/opengauss_source/openGauss-server/src/gausskernel/storage/replication/syncrep.cpp:1622: undefined reference to `syncrep_scanner_yylex(syncrep_scanner_YYSTYPE*, int*, void*)'
ld: ../../src/common/pl/plpgsql/src/libplpgsql.a(pl_scanner.o): in function `internal_yylex(TokenAuxData*)':
/home/shift/opengauss_source/openGauss-server/src/common/pl/plpgsql/src/pl_scanner.cpp:321: undefined reference to `core_yylex(core_YYSTYPE*, int*, void*)'
make[2]: *** [Makefile:343：gaussdb] 错误 1
make[1]: *** [Makefile:64：all-gausskernel-recurse] 错误 2
make: *** [GNUmakefile:11：all-src-recurse] 错误 2

**What you expected to happen**:

**How to reproduce it (as minimally and precisely as possible)**:

**Anything else we need to know?**:

**Environment**:
- Version:
- OS (e.g. from /etc/os-release):
- Kernel (e.g. `uname -a`):
- Install tools:
- Others:

你好，能否看下机器上flex和bison的版本是多少？
看着像这两个组件引起的问题。

ubuntu 18.04 版本， flex 2.6.4 ， bison (GNU Bison) 3.5.4 碰到一样的问题

ubuntu@ubuntu:~$ flex --version
flex 2.6.4
ubuntu@ubuntu:~$ bison --version
bison (GNU Bison) 3.5.4

Looks like flex changed its behaviour in this commit:

commit a1634aa8d3d41a257ad659788dac222739df89f5
Author: Demi Obenour demiobenour@gmail.com
Date: Tue May 2 20:05:14 2017 -0400

Honor user definitions of yy_* macros

The user may have defined the yy_* macros themselves.  In that case,
don't clobber them.

我们也遇到了同样的问题
```
LSB Version:    n/a                                                                                                    
Distributor ID: openEuler                                                                                              
Description:    openEuler release 20.03 (LTS-SP2)                                                                      
Release:        20.03                                                                                                  
Codename:       LTS-SP2
```
```text
[root@localhost sda]# uname -a
Linux localhost.localdomain 4.19.90-2106.3.0.0095.oe1.x86_64 #1 SMP Wed Jun 23 15:18:59 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
```
```text
[root@localhost sda]# flex --version
flex 2.5.37
[root@localhost sda]# bison --version
bison (GNU Bison) 3.6.4
```
经测试flex版本2.5.37，2.5.39，2.6.1，2.6.4均无法编译通过，且报错信息一致

在此之前我们还在configure阶段遇到了这一问题
https://gitee.com/opengauss/openGauss-server/issues/I1MC1E
经过debug发现
```
export LD_LIBRARY_PATH=$GCC_PATH/gmp/lib/:$LD_LIBRARY_PATH
```
会导致`expr`命令无法正确执行，具体来说`*`无法识别，导致`configure`代码3524行`exit 1`
我们的解决方案是手动计算了`expr`表达式的值并赋值给`RELSEG_SIZE`，以此通过了configure阶段

但编译阶段的`core_yylex`未定义的问题仍无法解决

发现 make distclean 并不会清理*.inc文件，因此重新clone一份代码目录，编译成功

GVP openGauss/openGauss-server

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GVPopenGauss/openGauss-server

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