.

diff --git a/src/Makefile.in b/src/Makefile.in
index 9eaf95a4241adf0e11f41d5aae65dcd9037829fd..0f204866490cf5374c3a1176d5a2200a9be2c69e 100644 (file)
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -1716,6 +1716,25 @@ check-misc:
          done | $(ASSORT) -u ) > $@-t
        chmod a-w $@-t
        mv $@-t $@
+
+# The following rule is not designed to be portable,
+# and relies on tools that not everyone has.
+
+# Most functions in src/*.c should have static scope.
+# Any that don't must be marked with `extern', but `main'
+# and `usage' are exceptions.  They're always extern, but
+# don't need to be marked.
+sc_src_functions_have_static_scope: $(all_programs)
+       @t=exceptions-$$$$;                                             \
+       trap "s=$$?; rm -f $$t; exit $$s" 0 1 2 13 15;                  \
+       ( printf '^main$$\n^usage$$\n';                                 \
+         grep -h -A1 '^extern .*[^;]$$' $(SOURCES)                     \
+           | grep -vE '^(extern |--)' |sed 's/^/^/;s/ .*/$$/' ) > $$t; \
+       nm -e *.$(OBJEXT)                                               \
+           | sed -n 's/.* T //p'                                       \
+           | grep -Ev -f $$t &&                                        \
+         { echo 'the above functions should have static scope' 1>&2;   \
+           exit 1; } || :
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT: