+ # Do the 'setting' values second, the algorithm the standard
+ # tree walk (O(1)) done in an O(2) while/for loop; interations
+ # settings x depth, outputing the deepest required macros
+ # first.
+ print "" >out
+ print "/* SETTINGS */" >out
+ print comment, "settings", cend >out
+ # Sort (in dfn.awk) on field 2, the setting name
+ print "PNG_DFN_START_SORT 2" >out
+ finished = 0
+ while (!finished) {
+ finished = 1
+ movement = 0 # done nothing
+ for (i in setting) if (!doneset[i]) {
+ nreqs = split(setting[i], r)
+ if (nreqs > 0) {
+ # By default assume the requires values are options, but if there
+ # is no option with that name check for a setting
+ for (j=1; j<=nreqs; ++j) if (option[r[j]] == "" && !doneset[r[j]]) {
+ break
+ }
+ if (j<=nreqs) {
+ finished = 0
+ continue # try a different setting
+ }
+ }
+
+ # All the requirements have been processed, output
+ # this setting.
+ if (deb) print "setting", i
+ deflt = defaults[i]
+ # Remove any spurious trailing spaces
+ sub(/ *$/,"",deflt)
+ # A leading @ means leave it unquoted so the preprocessor
+ # can substitute the build time value
+ if (deflt ~ /^ @/)
+ deflt = " " subs substr(deflt, 3) sube
+ print "" >out
+ print "/* setting: ", i >out
+ print " * requires:" setting[i] >out
+ print " * default: ", defaults[i] deflt, "*/" >out
+ for (j=1; j<=nreqs; ++j) {
+ if (option[r[j]] != "")
+ print "#ifndef PNG_" r[j] "_SUPPORTED" >out
+ else
+ print "#ifndef PNG_" r[j] >out
+ print error, i, "requires", r[j] end >out
+ print "# endif" >out
+ }
+ # The precedence is:
+ #
+ # 1) External definition; trumps:
+ # 2) Option 'sets' value; trumps:
+ # 3) Setting 'default'
+ #
+ print "#ifdef PNG_" i >out
+ # PNG_<i> is defined, so substitute the value:
+ print def i, subs "PNG_" i sube end >out
+ print "#else /* use default */" >out
+ print "# ifdef PNG_set_" i >out
+ # Value from an option 'sets' argument
+ print def i, subs "PNG_set_" i sube end >out
+ # This is so that subsequent tests on the setting work:
+ print "# define PNG_" i, "1" >out
+ if (defaults[i] != "") {
+ print "# else /*default*/" >out
+ print def i deflt end >out
+ print "# define PNG_" i, "1" >out
+ }
+ print "# endif /* defaults */" >out
+ print "#endif /* setting", i, "*/" >out
+
+ doneset[i] = 1
+ ++movement
+ }
+
+ if (!finished && !movement) {
+ print "setting: loop or missing setting in 'requires', cannot process:"
+ for (i in setting) if (!doneset[i]) {
+ print " setting", i, "requires" setting[i]
+ }
+ exit 1
+ }
+ }
+ print "PNG_DFN_END_SORT" >out
+ print comment, "end of settings", cend >out
+
projects / wxWidgets.git / blobdiff