Comment 2 for bug 1272732

In case of 5.6:

openxs@ao756:~/bzr/percona-5.6/build-ps$ grep -rn FLAGS *
build-binary.sh:17:TARGET_CFLAGS=''
build-binary.sh:47: TARGET_CFLAGS="-m32 -march=i686"
build-binary.sh:157:export CFLAGS="-fPIC -Wall -O3 -g -static-libgcc -fno-omit-frame-pointer -DPERCONA_INNODB_VERSION=$PERCONA_SERVER_VERSION $TARGET_CFLAGS ${ FLAGS:-}"
build-binary.sh:158:export CXXFLAGS="-O2 -fno-omit-frame-pointer -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -DPERCONA_INNODB_VERSION=$PERCONA_SERVER_VERSION $TARGET_CFLAGS ${CXXFLAGS:-}"
build-rpm.sh:20:TARGET_CFLAGS=''
build-rpm.sh:40: TARGET_CFLAGS="-m32 -march=i686"
build-rpm.sh:93: TARGET_CFLAGS='-m32 -march=i686'
build-rpm.sh:126:export CFLAGS="-fPIC -Wall -O3 -g -static-libgcc -fno-omit-frame-pointer -DPERCONA_INNODB_VERSION=$PERCONA_SERVER_VERSION $TARGET_CFLAGS ${CFLAGS:-}"
build-rpm.sh:127:export CXXFLAGS="-O2 -fno-omit-frame-pointer -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -DPERCONA_INNODB_VERSION=$PERCONA_SERVER_VERSION $TARGET_CFLAGS ${CXXFLAGS:-}"
debian/rules:81: CFLAGS=$${MYSQL_BUILD_CFLAGS:-"-O3 -DBIG_JOINS=1"} \
debian/rules:83: CXXFLAGS=$${MYSQL_BUILD_CXXFLAGS:-"-O3 -DBIG_JOINS=1 -felide-constructors -fno-exceptions -fno-rtti"} \
percona-server.spec:340: CXXFLAGS="$CXXFLAGS -I$RPM_BUILD_DIR/%{src_dir}/release/include" \
percona-server.spec:352:# name, finally a default. RPM_OPT_FLAGS is assumed to be a part of the
percona-server.spec:361:# This is a hack, $RPM_OPT_FLAGS on ia64 hosts contains flags which break
percona-server.spec:365:RPM_OPT_FLAGS=
percona-server.spec:371:export CFLAGS=${MYSQL_BUILD_CFLAGS:-${CFLAGS:-$RPM_OPT_FLAGS}}
percona-server.spec:372:export CXXFLAGS=${MYSQL_BUILD_CXXFLAGS:-${CXXFLAGS:-$RPM_OPT_FLAGS -felide-constructors -fno-rtti}}
percona-server.spec:373:export LDFLAGS=${MYSQL_BUILD_LDFLAGS:-${LDFLAGS:-}}
percona-server.spec:391: CFLAGS=`echo " ${CFLAGS} " | \
percona-server.spec:397: CXXFLAGS=`echo " ${CXXFLAGS} " | \
percona-server.spec:470: libgcc=`$CC $CFLAGS --print-libgcc-file`
percona-server.spec:1277:- Modify CFLAGS and CXXFLAGS such that a debug build is not optimized.
percona-server.spec:1338:- Add CFLAGS to gcc call with --print-libgcc-file, to make sure the
percona-server.spec:1430:- Set $LDFLAGS from $MYSQL_BUILD_LDFLAGS
percona-server.spec:1745:- CFLAGS and CXXFLAGS should honor RPM_OPT_FLAGS