BEGIN {
state = "nm";
+ sawsymbol = 0;
+ if (leading_underscore)
+ prefix = "_";
+ else
+ prefix = "";
}
# Remove comment and blank lines.
state == "nm" && NF == 3 {
def[$3] = 1;
+ sawsymbol = 1;
next;
}
# for beginning and ending each section, and %inherit markers for
# describing version inheritence. A symbol may appear in more than
# one symbol version, and the last seen takes effect.
+# The magic version name '%exclude' causes all the symbols given that
+# version to be dropped from the output (unless a later version overrides).
NF == 3 && $1 == "%inherit" {
inherit[$2] = $3;
}
NF == 2 && $2 == "{" {
- libs[$1] = 1;
+ if ($1 != "%exclude")
+ libs[$1] = 1;
thislib = $1;
next;
}
}
{
- ver[$1] = thislib;
+ sym = prefix $1;
+ if (thislib != "%exclude")
+ ver[sym] = thislib;
+ else
+ delete ver[sym];
next;
}
END {
+ if (!sawsymbol)
+ {
+ print "No symbols seen -- broken or mis-installed nm?" | "cat 1>&2";
+ exit 1;
+ }
for (l in libs)
output(l);
}
if (inherit[lib])
output(inherit[lib]);
- printf("%s {\n", lib);
- printf(" global:\n");
+ empty=1
for (sym in ver)
if ((ver[sym] == lib) && (sym in def))
- printf("\t%s;\n", sym);
-
- if (inherit[lib])
+ {
+ if (empty)
+ {
+ printf("%s {\n", lib);
+ printf(" global:\n");
+ empty = 0;
+ }
+ printf("\t%s;\n", sym);
+ }
+
+ if (empty)
+ {
+ for (l in libs)
+ if (inherit[l] == lib)
+ inherit[l] = inherit[lib];
+ }
+ else if (inherit[lib])
printf("} %s;\n", inherit[lib]);
else
printf ("\n local:\n\t*;\n};\n");