Factor %FLAG at scan level.

[bison.git] / maint.mk

diff --git a/maint.mk b/maint.mk
index 93d6b6aa6ea1c39b1e22f2dcb7a37295e54c2c4f..b83e1dcec873d25c0ca859e96d67baebf7f2712d 100644 (file)
--- a/maint.mk
+++ b/maint.mk
@@ -404,8 +404,33 @@ sc_the_the:
          { echo '$(ME): found use of "the ''the";' 1>&2;               \
            exit 1; } || :
 
-#sc_tight_scope:
-#      $(MAKE) -C src $@
+# 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.
+#
+# The second nm|grep checks for file-scope variables with `extern' scope.
+sc_tight_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 .*[^;]$$' $(SOURCES)                     \
+           | grep -vE '^(extern |--)' |sed 's/^/^/;s/ .*/$$/' ) > $$t; \
+       if nm -e *.$(OBJEXT)                                            \
+           | sed -n 's/.* T //p'                                       \
+           | grep -Ev -f $$t; then                                     \
+         echo 'the above functions should have static scope' 1>&2;     \
+         exit 1;                                                       \
+       fi;                                                             \
+       ( printf '^program_name$$\n';                                   \
+         sed -n 's/^extern .*[* ]\([a-zA-Z_][a-zA-Z_0-9]*\);$$/^\1$$/p' \
+           $$(ls $(SOURCES) | grep '\.h$$') /dev/null) > $$t;          \
+       if nm -e *.$(OBJEXT)                                            \
+           | sed -n 's/.* [BD] //p'                                    \
+           | grep -Ev -f $$t; then                                     \
+         echo 'the above variables should have static scope' 1>&2;     \
+         exit 1;                                                       \
+       fi
 
 sc_trailing_blank:
        @grep -n '[      ]$$' $$($(VC_LIST_EXCEPT)) &&                  \