build: stop on error in subcommand

make only evaluates $? of an entire shell invocation. As such, if any
command in the chain can fail, $? needs to be thrown, and early so.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

diff --git a/extensions/GNUmakefile.in b/extensions/GNUmakefile.in
index 7c4790187e4c5eebc0e0739c8b88ff0ce836802b..74a058c141cd01af566c8958db27bb40d514053d 100644 (file)
--- a/extensions/GNUmakefile.in
+++ b/extensions/GNUmakefile.in
@@ -165,14 +165,14 @@ man_run    = \
                if [ -f "$$f" ] && grep -Eq "$(3)|NFPROTO_UNSPEC" "$$cf"; then \
                        echo -e "\t+ $$f" >&2; \
                        echo ".SS $$ext"; \
-                       cat "$$f"; \
+                       cat "$$f" || exit $$?; \
                        continue; \
                fi; \
                f="${srcdir}/lib$(2)t_$$ext.man"; \
                if [ -f "$$f" ]; then \
                        echo -e "\t+ $$f" >&2; \
                        echo ".SS $$ext"; \
-                       cat "$$f"; \
+                       cat "$$f" || exit $$?; \
                        continue; \
                fi; \
        done >$@;