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build: Move optimization flags into a separate variable

Isolate optimization related compiler flags from CFLAGS and move them into a
separate COPTS variable so that it is easier to override optimizations from
the environment.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

--- a/pppd/plugins/radius/Makefile.linux
+++ b/pppd/plugins/radius/Makefile.linux
@@ -12,7 +12,8 @@ VERSION = $(shell awk -F '"' '/VERSION/
 INSTALL        = install
 
 PLUGIN=radius.so radattr.so radrealms.so
-CFLAGS=-I. -I../.. -I../../../include -O2 -fPIC -DRC_LOG_FACILITY=LOG_DAEMON
+COPTS = -O2
+CFLAGS=-I. -I../.. -I../../../include $(COPTS) -fPIC -DRC_LOG_FACILITY=LOG_DAEMON
 
 # Uncomment the next line to include support for Microsoft's
 # MS-CHAP authentication protocol.
@@ -43,13 +44,13 @@ install: all
        $(INSTALL) -c -m 444 pppd-radattr.8 $(MANDIR)
 
 radius.so: radius.o libradiusclient.a
-       $(CC) $(LDFLAGS) -o radius.so -shared radius.o libradiusclient.a
+       $(CC) $(LDFLAGS) -fPIC -o radius.so -shared radius.o libradiusclient.a
 
 radattr.so: radattr.o
-       $(CC) $(LDFLAGS) -o radattr.so -shared radattr.o
+       $(CC) $(LDFLAGS) -fPIC -o radattr.so -shared radattr.o
 
 radrealms.so: radrealms.o
-       $(CC) $(LDFLAGS) -o radrealms.so -shared radrealms.o
+       $(CC) $(LDFLAGS) -fPIC -o radrealms.so -shared radrealms.o
 
 CLIENTOBJS = avpair.o buildreq.o config.o dict.o ip_util.o \
        clientid.o sendserver.o lock.o util.o md5.o
--- a/pppdump/Makefile.linux
+++ b/pppdump/Makefile.linux
@@ -2,7 +2,8 @@ DESTDIR = $(INSTROOT)@DESTDIR@
 BINDIR = $(DESTDIR)/sbin
 MANDIR = $(DESTDIR)/share/man/man8
 
-CFLAGS= -O -I../include/net
+COPTS = -O
+CFLAGS= $(COPTS) -I../include/net
 OBJS = pppdump.o bsd-comp.o deflate.o zlib.o
 
 INSTALL= install
--- a/pppd/plugins/rp-pppoe/Makefile.linux
+++ b/pppd/plugins/rp-pppoe/Makefile.linux
@@ -39,7 +39,7 @@ debug.o: debug.c
        $(CC) $(CFLAGS) -c -o debug.o debug.c
 
 rp-pppoe.so: plugin.o discovery.o if.o common.o
-       $(CC) $(LDFLAGS) -o rp-pppoe.so -shared plugin.o discovery.o if.o common.o
+       $(CC) $(LDFLAGS) -fPIC -o rp-pppoe.so -shared plugin.o discovery.o if.o common.o
 
 install: all
        $(INSTALL) -d -m 755 $(LIBDIR)