I was trying to build gcc 4.4 rpm for centos7 using mock build
but I'm getting build error.

Please find the build.log below

sinput.adb:776:19: deallocation from empty storage pool
make[3]: *** [ada/sinput.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory `/builddir/build/BUILD/gcc-4.4.7-20120601/obj-i686-redhat-linux/gcc'
make[2]: *** [all-stage1-gcc] Error 2
make[2]: Leaving directory `/builddir/build/BUILD/gcc-4.4.7-20120601/obj-i686-redhat-linux'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/builddir/build/BUILD/gcc-4.4.7-20120601/obj-i686-redhat-linux'
make: *** [profiledbootstrap] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.dHhp5l (%build)
RPM build errors:
Bad exit status from /var/tmp/rpm-tmp.dHhp5l (%build)
Child return code was: 1

please help me to solve this

Welcome to LQ. Usually, the first error in a build is the problem, in your case Are you sure there's no error before that? I would expect some bad news before the 'deallocation' stuff, which is tidying up afterwards. Error 1 is Permissions. If you're building as a user, is something root owned?

Why not install the red hat gcc stuff? gcc-4.4.7 is old these days. Slackware-14.2 is about a year old and uses 5.3.0, and slackware-current (their next release) is at gcc-7.2.0.

In general, building stuff is bad news on a tightly regulated system like Centos, because everything gets updated around you and then the libs clash. If you build an rpm for gcc-4.4.7, you might just get the middle finger when you try installing it.