xstr -c name
will extract the strings from the C source in name, replacing string references by expressions of the form (&xstr[number]) for some number. An appropriate declaration of xstr is prepended to the file. The resulting C text is placed in the file x.c, to then be compiled. The strings from this file are placed in the strings data base if they are not there already. Repeated strings and strings which are suffices of existing strings do not cause changes to the data base.
After all components of a large program have been compiled,
a file xs.c declaring the common xstr
space can be created by a command of the form
xstr name1 name2 name3 ...
This xs.c file should then be compiled and loaded with the rest of the program. If possible, the array can be made read-only (shared) saving space and swap overhead.
xstr can also be used on a single file. A command
creates files x.c and xs.c as before, without using or affecting any strings file in the same directory.
It may be useful to run xstr after the C preprocessor
if any macro definitions yield strings or if there is conditional
code which contains strings which may not, in fact, be needed.
xstr reads from its standard input when the argument
``-'' is given. An appropriate command sequence for running
xstr after the C preprocessor is:
cc -E name.c | xstr -c -
cc -c x.c
mv x.o name.o
xstr does not touch the file strings unless new items are added, thus make can avoid remaking xs.o unless truly necessary.