diff --git a/src/cmd/builtin/Mamfile b/src/cmd/builtin/Mamfile
index 2cdd31f7afe7..afee6927fb1b 100644
--- a/src/cmd/builtin/Mamfile
+++ b/src/cmd/builtin/Mamfile
@@ -8,7 +8,7 @@ setv MAMAKE_STRICT 3
 setv INSTALLROOT ../../..
 setv PACKAGE_ast_INCLUDE ${INSTALLROOT}/include/ast
 setv CC cc
-setv mam_cc_FLAGS ${mam_cc_TARGET} ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?} ${mam_cc_NOSTRICTALIASING}
+setv mam_cc_FLAGS ${mam_cc_TARGET} ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?}
 setv CCFLAGS
 setv CCLDFLAGS ${-strip-symbols?1?${mam_cc_LD_STRIP}??}
 setv IFFEFLAGS
@@ -134,7 +134,7 @@ make install virtual
 			exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -I${PACKAGE_ast_INCLUDE} \
 			exec -	-DERROR_CATALOG=\""builtin"\" -DCMD_STANDALONE=b_pty -c ${<}
 		done pty.o
-		exec - ${CC} ${CCLDFLAGS} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS} ${mam_cc_L+-L.} \
+		exec - ${CC} ${CCLDFLAGS} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} ${LDFLAGS} ${mam_cc_L+-L.} \
 		exec -	${mam_cc_L+-L${INSTALLROOT}/lib} -o pty pty.o ${mam_libutil} ${mam_libast} ${mam_libcmd}
 	done pty
 
diff --git a/src/cmd/ksh93/Mamfile b/src/cmd/ksh93/Mamfile
index eab7d105d6af..5b6221bfbde0 100644
--- a/src/cmd/ksh93/Mamfile
+++ b/src/cmd/ksh93/Mamfile
@@ -8,7 +8,7 @@ setv INSTALLROOT ../../..
 setv PACKAGE_ast_INCLUDE ${INSTALLROOT}/include/ast
 setv CC cc
 setv AR ${mam_cc_AR} ${mam_cc_AR_ARFLAGS}
-setv mam_cc_FLAGS ${mam_cc_TARGET} ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?} ${mam_cc_NOSTRICTALIASING}
+setv mam_cc_FLAGS ${mam_cc_TARGET} ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?}
 setv CCFLAGS
 setv CCLDFLAGS ${-strip-symbols?1?${mam_cc_LD_STRIP}??}
 setv IFFEFLAGS
@@ -167,7 +167,7 @@ make install virtual
 
 	make shell.req
 		prev ${INSTALLROOT}/bin/mkreq
-		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} : ${LDFLAGS} : \
+		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} : ${LDFLAGS} : \
 		exec -		shell dll cmd ast m jobs i socket nsl secdb network
 	done
 
@@ -175,7 +175,7 @@ make install virtual
 	note * Feature tests
 	note *
 
-	setv iffe_run iffe ${IFFEFLAGS} -v -c '${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS}' ref ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libdll} ${mam_libcmd} ${mam_libast} ${mam_libm} ${mam_libnsl} : run
+	setv iffe_run iffe ${IFFEFLAGS} -v -c '${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} ${LDFLAGS}' ref ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libdll} ${mam_libcmd} ${mam_libast} ${mam_libm} ${mam_libnsl} : run
 
 	make features/time
 		prev ${PACKAGE_ast_INCLUDE}/times.h
@@ -1157,7 +1157,7 @@ make install virtual
 	note * Set common compiler invocation arguments
 	note *
 
-	setv compile ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${DEBUG+-DDEBUG=${DEBUG}} -DSH_DICT=${SH_DICT} ${SH_CMDLIB_DIR+-DSH_CMDLIB_DIR=${SH_CMDLIB_DIR}} -I. -Iinclude -I${PACKAGE_ast_INCLUDE} -D_API_ast=20100309 -DERROR_CONTEXT_T=Error_context_t -c
+	setv compile ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} ${DEBUG+-DDEBUG=${DEBUG}} -DSH_DICT=${SH_DICT} ${SH_CMDLIB_DIR+-DSH_CMDLIB_DIR=${SH_CMDLIB_DIR}} -I. -Iinclude -I${PACKAGE_ast_INCLUDE} -D_API_ast=20100309 -DERROR_CONTEXT_T=Error_context_t -c
 
 	note *
 	note * Build the library
diff --git a/src/lib/libast/Mamfile b/src/lib/libast/Mamfile
index 6e40f0d2ec89..4e9ef2835233 100644
--- a/src/lib/libast/Mamfile
+++ b/src/lib/libast/Mamfile
@@ -8,7 +8,7 @@ setv INSTALLROOT ../../..
 setv PACKAGEROOT ../../../../..
 setv CC cc
 setv AR ${mam_cc_AR} ${mam_cc_AR_ARFLAGS}
-setv mam_cc_FLAGS ${mam_cc_TARGET} ${mam_cc_DLL} -D_BLD_ast ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?} ${mam_cc_NOSTRICTALIASING}
+setv mam_cc_FLAGS ${mam_cc_TARGET} ${mam_cc_DLL} -D_BLD_ast ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?}
 setv CCFLAGS
 setv CCLDFLAGS ${-strip-symbols?1?${mam_cc_LD_STRIP}??}
 setv IFFEFLAGS
@@ -23,7 +23,7 @@ shim - invoke_iffe()
 shim - {
 shim -     s=$1
 shim -     shift
-shim -     set -- ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS} "$@"
+shim -     set -- ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} ${LDFLAGS} "$@"
 shim -     iffe ${IFFEFLAGS} -v -X ast -X std -c "$*" run "$s"
 shim - }
 shim -
@@ -31,7 +31,7 @@ shim - compile()
 shim - {
 shim -     s=$1
 shim -     shift
-shim -     ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -Icomp "$@" -Iinclude -Istd -c "$s"
+shim -     ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} -I. -Icomp "$@" -Iinclude -Istd -c "$s"
 shim - }
 
 make install virtual
@@ -287,7 +287,7 @@ make install virtual
 		note *
 		prev ${INSTALLROOT}/bin/mkreq
 		exec - set -o errexit
-		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} : ${LDFLAGS} : ast iconv w
+		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} : ${LDFLAGS} : ast iconv w
 		note *
 		note * some systems move -lc routines to -lm; see astmath.c for details
 		note *
@@ -295,7 +295,7 @@ make install virtual
 			make port/astmath.c
 				prev std/endian.h
 			done
-			setv _math_test ${CC} ${CCLDFLAGS} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS} -DN=$N -DIS -o astmath.exe ${<}
+			setv _math_test ${CC} ${CCLDFLAGS} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} ${LDFLAGS} -DN=$N -DIS -o astmath.exe ${<}
 			exec - X=1
 			exec - for N in 1 2 3 4 5 6 7 8
 			exec - do	if	${_math_test} 2>/dev/null
@@ -353,7 +353,7 @@ make install virtual
 						exec - EOF
 					done
 					prev comp/conf.tab
-					exec - conf -v ${<} ${CC} ${mam_cc_FLAGS} ${CCFLAGS}
+					exec - conf -v ${<} ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING}
 				done
 			done features/limits.c
 			exec - invoke_iffe ${<} -I. -Icomp -Iinclude -Istd
@@ -521,7 +521,7 @@ make install virtual
 				make port/lcgen.c
 					prev std/stdio.h
 				done
-				exec - ${CC} ${CCLDFLAGS} ${CCFLAGS} ${LDFLAGS} -o lcgen port/lcgen.c
+				exec - ${CC} ${CCLDFLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} ${LDFLAGS} -o lcgen port/lcgen.c
 			done
 			exec - lcgen lc.h lctab.c < port/lc.tab
 		done
@@ -5043,7 +5043,7 @@ make install virtual
 			exec - compile ${<} -D_PACKAGE_ast
 		done
 		bind -last
-		exec - ${CC} ${CCLDFLAGS} ${CCFLAGS} ${LDFLAGS} -o ${@} ${<} ${mam_libast} || exit
+		exec - ${CC} ${CCLDFLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} ${LDFLAGS} -o ${@} ${<} ${mam_libast} || exit
 		note *
 		note * We purposely do not have a make target of ${INSTALLROOT}/bin/mamake here;
 		note * this helps to ensure that the package.sh-built version gets overwritten.
diff --git a/src/lib/libcmd/Mamfile b/src/lib/libcmd/Mamfile
index f055bb043752..500a0fddf173 100644
--- a/src/lib/libcmd/Mamfile
+++ b/src/lib/libcmd/Mamfile
@@ -147,14 +147,14 @@ make install virtual
 	bind -lsum
 	make cmd.req
 		prev ${INSTALLROOT}/bin/mkreq
-		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} : ${LDFLAGS} : cmd fsg md util ast
+		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} : ${LDFLAGS} : cmd fsg md util ast
 	done
 
 	note *
 	note * Header dependencies and feature tests
 	note *
 
-	setv run_iffe iffe ${IFFEFLAGS} -v -c "${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS}" ref ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libutil} ${mam_libast} : run
+	setv run_iffe iffe ${IFFEFLAGS} -v -c "${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} ${LDFLAGS}" ref ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libutil} ${mam_libast} : run
 
 	make deps virtual
 		make cmdinit.c
@@ -468,7 +468,7 @@ make install virtual
 		loop OBJ cmdinit basename cat chgrp chmod chown cksum cmp comm cp cut dirname date expr fds fmt fold getconf head id join ln logname md5sum mkdir mkfifo mktemp mv paste pathchk pids rev rm rmdir stty sum sync tail tee tty uname uniq vmstate wc revlib wclib lib
 			make ${OBJ}.o
 				prev ${OBJ}.c
-				exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -I${PACKAGE_ast_INCLUDE} -DERROR_CATALOG=\""libcmd"\" -DHOSTTYPE=\""${mam_cc_HOSTTYPE}"\" -D_BLD_cmd -c ${<}
+				exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} -I. -I${PACKAGE_ast_INCLUDE} -DERROR_CATALOG=\""libcmd"\" -DHOSTTYPE=\""${mam_cc_HOSTTYPE}"\" -D_BLD_cmd -c ${<}
 			done
 		done
 		make sumlib.o
diff --git a/src/lib/libdll/Mamfile b/src/lib/libdll/Mamfile
index cc7242134f51..01054c02bffb 100644
--- a/src/lib/libdll/Mamfile
+++ b/src/lib/libdll/Mamfile
@@ -8,7 +8,7 @@ setv INSTALLROOT ../../..
 setv PACKAGE_ast_INCLUDE ${INSTALLROOT}/include/ast
 setv CC cc
 setv AR ${mam_cc_AR} ${mam_cc_AR_ARFLAGS}
-setv mam_cc_FLAGS ${mam_cc_TARGET} ${mam_cc_DLL} ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?} ${mam_cc_NOSTRICTALIASING}
+setv mam_cc_FLAGS ${mam_cc_TARGET} ${mam_cc_DLL} ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?}
 setv CCFLAGS
 setv IFFEFLAGS
 setv LDFLAGS
@@ -103,7 +103,7 @@ make install virtual
 	bind -last
 	make dll.req
 		prev ${INSTALLROOT}/bin/mkreq
-		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} : ${LDFLAGS} : dll dl dld ast
+		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} : ${LDFLAGS} : dll dl dld ast
 	done
 
 	note *
@@ -115,7 +115,8 @@ make install virtual
 		make dlldefs.h implicit
 			make FEATURE/dll
 				prev features/dll
-				exec - iffe ${IFFEFLAGS} -v -c '${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS}' \
+				exec - iffe ${IFFEFLAGS} -v -c '${CC} ${mam_cc_FLAGS} ${CCFLAGS} \
+				exec -  ${mam_cc_NOSTRICTALIASING} ${LDFLAGS}' \
 				exec -	ref ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} \
 				exec -	-I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include \
 				exec -	${mam_libdl} ${mam_libast} : run ${<}
@@ -175,7 +176,7 @@ make install virtual
 		loop OBJ dlfcn dllopen dllfind dllplug dll_lib dllnext dlllook dllscan dllcheck dllerror
 			make ${OBJ}.o
 				prev ${OBJ}.c
-				exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -I${PACKAGE_ast_INCLUDE} -D_BLD_dll -c ${<}
+				exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} -I. -I${PACKAGE_ast_INCLUDE} -D_BLD_dll -c ${<}
 			done
 		done
 		exec - if	test -f ${@}
diff --git a/src/lib/libsum/Mamfile b/src/lib/libsum/Mamfile
index 3f41cf1609f9..3017af8921de 100644
--- a/src/lib/libsum/Mamfile
+++ b/src/lib/libsum/Mamfile
@@ -8,7 +8,7 @@ setv INSTALLROOT ../../..
 setv PACKAGE_ast_INCLUDE ${INSTALLROOT}/include/ast
 setv CC cc
 setv AR ${mam_cc_AR} ${mam_cc_AR_ARFLAGS}
-setv mam_cc_FLAGS ${mam_cc_TARGET} ${mam_cc_PIC} ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?} ${mam_cc_NOSTRICTALIASING}
+setv mam_cc_FLAGS ${mam_cc_TARGET} ${mam_cc_PIC} ${-debug-symbols?1?${mam_cc_DEBUG} -D_BLD_DEBUG?${mam_cc_OPTIMIZE}?}
 setv CCFLAGS
 setv IFFEFLAGS
 setv LDFLAGS
@@ -94,7 +94,7 @@ make install virtual
 	bind -last
 	make sum.req
 		prev ${INSTALLROOT}/bin/mkreq
-		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} : ${LDFLAGS} : sum md ast
+		exec - mkreq ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} : ${LDFLAGS} : sum md ast
 	done
 
 	note *
@@ -117,7 +117,8 @@ make install virtual
 				prev sum-ast4.c implicit
 				make FEATURE/sum implicit
 					prev features/sum
-					exec - iffe ${IFFEFLAGS} -v -c '${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS}' \
+					exec - iffe ${IFFEFLAGS} -v -c '${CC} ${mam_cc_FLAGS} ${CCFLAGS} \
+					exec -  ${mam_cc_NOSTRICTALIASING} ${LDFLAGS}' \
 					exec -	ref ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} \
 					exec -	-I${INSTALLROOT}/include ${mam_libast} : run ${<}
 				done
@@ -134,7 +135,7 @@ make install virtual
 					prev ${PACKAGE_ast_INCLUDE}/ast.h
 				done
 			done
-			exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -I${PACKAGE_ast_INCLUDE} -c ${<}
+			exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${mam_cc_NOSTRICTALIASING} -I. -I${PACKAGE_ast_INCLUDE} -c ${<}
 		done sumlib.o
 		exec - ${AR} rc ${@} ${<} || exit
 		exec - ranlib ${@} >/dev/null 2>&1 || true