The distro-wide architecture set in CFLAGS is overriden by 389-ds-base
buildsystem. It tries to set -march to non-existing values on s390(x), for ppc*
such compiler option doesn't even exist. The buildsystem should touch the
-march options at all. See also
https://fedoraproject.org/wiki/Packaging:Guidelines#Compiler_flags
from build logs
http://s390.koji.fedoraproject.org/koji/taskinfo?taskID=1851358
...
gcc -Wall -Wno-unknown-pragmas -std=c99 -march=s390 -c -I"src" -I"inc" -fpic
-O0 -g -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
-grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m31
-march=z9-109 -mtune=z10  -o obj/queue_queue.o src/queue/queue_queue.c
gcc: error: unrecognized argument in option '-march=s390'
gcc: note: valid arguments to '-march=' are: g5 g6 z10 z196 z9-109 z9-ec z900
z990 zEC12
...
and
http://ppc.koji.fedoraproject.org/koji/taskinfo?taskID=2559662
...
gcc -Wall -Wno-unknown-pragmas -std=c99 -march=ppc64le -c -I"src" -I"inc" -fpic
-O0 -g -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
-grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64
-mcpu=power7 -mtune=power8  -o obj/queue_new.o src/queue/queue_new.c
gcc -MM -std=c99 -I"src" -I"inc" src/stack/stack_delete.c >obj/stack_delete.d
cc1: error: unrecognized command line option '-march=ppc64le'
...
Version-Release number of selected component (if applicable):
389-ds-base-1.3.4.0-1.fc22