$ rpm -ql rpm | grep macros
/usr/lib/rpm/macros
/usr/lib/rpm/macros.d
/usr/lib/rpm/platform/aarch64-linux/macros
...
/usr/lib/rpm/platform/x86_64-linux/macros
/usr/share/doc/rpm-4.11.3/macros

$ ll /etc/rpm/
total 132
-rw-r--r--. 1 root root   170 Mar  9  2019 macros.blender
-rw-r--r--. 1 root root  1470 Nov  5  2016 macros.cmake
-rw-r--r--. 1 root root    53 Apr 11  2018 macros.cups
-rw-r--r--. 1 root root    66 Oct  8  2018 macros.dist
-rw-r--r--. 1 root root  1806 Apr 13  2018 macros.dwz
-rw-r--r--. 1 root root   324 Sep 20  2017 macros.emacs
-rw-r--r--. 1 root root 13543 Nov 21  2015 macros.fjava
-rw-r--r--. 1 root root  2673 Jan 25  2014 macros.gconf2
-rw-r--r--. 1 root root   215 Apr 13  2018 macros.ghc-srpm
-rw-r--r--. 1 root root   227 Apr 13  2018 macros.gnat-srpm
-rw-r--r--. 1 root root  4700 Nov 21  2015 macros.jpackage
-rw-r--r--. 1 root root   105 Apr 13  2018 macros.mono-srpm
-rw-r--r--. 1 root root   228 Apr 13  2018 macros.nodejs-srpm
-rw-r--r--. 1 root root   115 Apr 13  2018 macros.ocaml-srpm
-rw-r--r--. 1 root root  5134 Mar  2  2017 macros.perl
-rw-r--r--. 1 root root   794 Jun 10  2014 macros.perl-srpm
-rw-r--r--. 1 root root  2336 Nov  6  2016 macros.pesign
-rw-r--r--. 1 root root   297 Nov  6  2016 macros.prelink
-rw-r--r--. 1 root root   886 Oct 14 00:03 macros.pybytecompile
-rw-r--r--. 1 root root  3348 Oct 14 00:03 macros.python
-rw-r--r--. 1 root root  1495 Oct 14 00:03 macros.python2
-rw-r--r--. 1 root root  1839 Oct 14 00:03 macros.python3
...

$ cat /usr/lib/rpm/macros | grep ___build_pre
%___build_pre   \
%{___build_pre}\
%__spec_prep_pre        %{___build_pre}
%__spec_build_pre       %{___build_pre}
%__spec_install_pre     %{___build_pre}
%__spec_check_pre       %{___build_pre}
#%__spec_autodep_pre    %{___build_pre}
%__spec_clean_pre       %{___build_pre}
%__spec_rmbuild_pre     %{___build_pre}

%bcond_without tcmalloc

%bcond_with tcmalloc

%if %{with selinux}
...
%else
...
%endif

$ rpmspec -q --buildrequires ceph.spec
$ rpmspec -q --srpm --requires ceph.spec
$ rpmspec --parse ceph.spec 2>/dev/null | grep BuildRequires

$ sed -e 's/@//g' < ceph.spec.in > ceph.spec
$ sed -i -e 's/%bcond_with make_check/%bcond_without make_check/g' ceph.spec
$ sudo yum install -y --skip-broken $(rpmspec --parse ceph.spec 2>/dev/null | grep BuildRequires | awk '{ print $2 }' | xargs)

// rpm/build/parsePrep.c

doSetupMacro
    /* Fix the permissions of the setup build tree */
    {   char *fix = rpmExpand("%{_fixperms} .", NULL);
        if (fix && *fix != '%') {
            appendLineStringBuf(spec->prep, fix);
        }
        free(fix);
    }

$ rpm --eval %{_fixperms}
/usr/bin/chmod -Rf a+rX,u+w,g-w,o-w

$ rpmbuild -ba --define "_topdir ${BUILDAREA}" --define "dist ${DIST}" --define "_fixperms %{nil}"