无法识别的命令"-fstack-clash-protection-O2"

```
[   86s] Executing(%build): /bin/sh -e /var/tmp/rpm-tmp.4csqC9
[   86s] + umask 022
[   86s] + cd /home/abuild/rpmbuild/BUILD
[   86s] + CFLAGS='-O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/generic-hardened-cc1 -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection'
[   86s] + export CFLAGS
[   86s] + CXXFLAGS='-O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/generic-hardened-cc1 -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection -fexceptions'
[   86s] + export CXXFLAGS
[   86s] + FFLAGS='-O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/generic-hardened-cc1 -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection -fexceptions -I/usr/lib64/gfortran/modules'
[   86s] + export FFLAGS
[   86s] + FCFLAGS='-O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/generic-hardened-cc1 -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection -fexceptions -I/usr/lib64/gfortran/modules'
[   86s] + export FCFLAGS
[   86s] + LDFLAGS='-Wl,-z,relro   -Wl,-z,now -specs=/usr/lib/rpm/generic-hardened-ld'
[   86s] + export LDFLAGS
[   86s] + CC=gcc
[   86s] + export CC
[   86s] + CXX=g++
[   86s] + export CXX
[   86s] + CCC=g++
[   86s] + export CCC
[   86s] + cd dlm-4.1.0
[   86s] + CFLAGS='-O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/generic-hardened-cc1 -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection-O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/generic-hardened-cc1 -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection'
[   86s] + make
[   86s] set -e; for d in libdlm dlm_controld dlm_tool fence; do make -C $d all; done
[   86s] make[1]: Entering directory '/home/abuild/rpmbuild/BUILD/dlm-4.1.0/libdlm'
[   86s] gcc libdlm.c -O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/generic-hardened-cc1 -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection-O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/generic-hardened-cc1 -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection -D_GNU_SOURCE -O2 -ggdb -Wall -Wformat -Wformat-security -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wextra -Wshadow -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Winline -Wredundant-decls -Wno-sign-compare -Wno-unused-parameter -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -fstack-clash-protection -fexceptions -fasynchronous-unwind-tables -fdiagnostics-show-option -fPIC -Wl,-z,now -D_REENTRANT -c -o libdlm.o
[   86s] cc1: error: unrecognized command-line option '-fstack-clash-protection-O2'
[   86s] make[1]: *** [Makefile:93: libdlm.o] Error 1
[   86s] make[1]: Leaving directory '/home/abuild/rpmbuild/BUILD/dlm-4.1.0/libdlm'
[   86s] make: *** [Makefile:2: all] Error 2
[   86s] error: Bad exit status from /var/tmp/rpm-tmp.4csqC9 (%build)
```

openEuler-rpm-config的开发者你好，我遇到一个报错: unrecognized command-line option '-fstack-clash-protection-O2'。

出现这个问题的原因是使用CFLAGS+=$RPM_OPT_FLAGS语句，CFLAGS的值末尾没有空格，此处的+=将会将两条命令无缝拼接，就出现-fstack-clash-protection-O2报错。

问题出现很巧合。首先%build阶段开始编译前先设置了CFLAGS的值，然后spec里面执行CFLAGS+=$RPM_OPT_FLAGS，最后就会出现-fstack-clash-protection-O2报错。我认为这个问题是openEuler-rpm-config的隐藏问题，希望openEuler-rpm-config能够分析修改下这个问题。

openEuler-rpm-config中CFLAGS定义的相关文件/usr/lib/rpm/openEuler/rpmrc、/usr/lib/rpm/openEuler/macros

关联issue: https://gitee.com/src-openeuler/dlm/issues/I7W9D8?from=project-issue

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