Merge pull request tianon#45 from chaifeng/fix-job-control

Fix missing Job Control builtins in Bash 3.0-4.3 and stabilize Bash 3.x builds

Author: tianon

Diff for: 3.0/Dockerfile

@@ -115,6 +115,10 @@ RUN set -eux; \
 		wget -O "support/$f" "https://git.savannah.gnu.org/cgit/config.git/plain/$f?id=7d3d27baf8107b630586c962c057e22149653deb"; \
 	done; \
 {{ ) end -}}
+{{ if env.version | IN("3.0", "3.1", "3.2", "4.0", "4.1", "4.2", "4.3") then ( -}}
+# https://github.com/tianon/docker-bash/pull/45
+	export CFLAGS='-Wno-error=implicit-int -Wno-error=implicit-function-declaration'; \
+{{ ) else "" end -}}
 	./configure \
 		--build="$gnuArch" \
 		--enable-readline \
@@ -135,7 +139,11 @@ RUN set -eux; \
 # parallel jobs workaround borrowed from Alpine :)
 	make y.tab.c; make builtins/libbuiltins.a; \
 {{ ) end -}}
+{{ if env.version | startswith("3.") then ( -}}
+	make -j 1; \
+{{ ) else ( -}}
 	make -j "$(nproc)"; \
+{{ ) end -}}
 	make install; \
 	cd /; \
 	rm -r /usr/local/src/bash; \