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# depend.awk -- awk script used to construct makefile dependencies
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# for nethack's source files (`make depend' support for Makefile.src).
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# cd src ; nawk -f depend.awk ../include/*.h list-of-.c/.cpp-files
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# This awk program scans each file in sequence, looking for lines beginning
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# with `#include "' and recording the name inside the quotes. For .h files,
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# that's all it does. For each .c file, it writes out a make rule for the
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# corresponding .o file; dependencies in nested header files are propagated
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# config.h and hack.h get special handling because of their heavy use;
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# timestamps for them allow make to avoid rechecking dates on
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# subsidiary headers for every source file;
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# extern.h gets special handling to avoid excessive recompilation
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# patchlev.h gets special handling because it only exists on systems
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# which consider filename patchlevel.h to be too long;
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# interp.c gets special handling because it usually doesn't exist; it's
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# assumed to be the last #include in the file where it occurs.
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# win32api.h gets special handling because it only exists for some ports;
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# it's assumed to be the last #include in the file where it occurs
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BEGIN { FS = "\"" #for `#include "X"', $2 is X
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special[++sp_cnt] = "../include/config.h"
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special[++sp_cnt] = "../include/hack.h"
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alt_deps["../include/extern.h"] = ""
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alt_deps["../include/patchlev.h"] = ""
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alt_deps["interp.c"] = " #interp.c" #comment it out
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alt_deps["../include/win32api.h"] = " #../include/win32api.h"
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FNR == 1 { output_dep() #finish previous file
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file = FILENAME #setup for current file
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/^\#[ \t]*include[ \t]+\"/ { #find `#include "X"'
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#[3.4.0: gnomehack headers currently aren't in include]
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if (incl ~ /^gn/) # gnomehack special case
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incl = "../win/gnome/" incl
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incl = "../include/" incl
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deps[file] = deps[file] " " incl
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END { output_dep() } #finish the last file
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# `file' has been fully scanned, so process it now; for .h files,
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# don't do anything (we've just been collecting their dependencies);
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# for .c files, output the `make' rule for corresponding .o file
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function output_dep( targ)
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if (file ~ /\.cp*$/) {
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#prior to very first .c|.cpp file, handle some special header file cases
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#construct object filename from source filename
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targ = file; sub("^.+/", "", targ); sub("\\.cp*$", ".o", targ)
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#format and write the collected dependencies
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format_dep(targ, file)
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# handle some targets (config.h, hack.h) via special timestamping rules
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function output_specials( i, sp, alt_sp)
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for (i = 1; i <= sp_cnt; i++) {
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#change "../include/foo.h" first to "foo.h", then ultimately to "$(FOO_H)"
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alt_sp = sp; sub("^.+/", "", alt_sp)
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print "#", alt_sp, "timestamp" #output a `make' comment
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#- sub("\\.", "_", alt_sp); alt_sp = "$(" toupper(alt_sp) ")"
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#+ Some nawks don't have toupper(), so hardwire these instead.
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sub("config.h", "$(CONFIG_H)", alt_sp); sub("hack.h", "$(HACK_H)", alt_sp);
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format_dep(alt_sp, sp) #output the target
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print "\ttouch " alt_sp #output a build command
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alt_deps[sp] = alt_sp #alternate dependency for depend()
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# write a target and its dependency list in pretty-printed format;
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# if target's primary source file has a path prefix, also write build command
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function format_dep(target, source, n, i, list)
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split("", done) #``for (x in done) delete done[x]''
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printf("%s:", target); col = length(target) + 1
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#- printf("\t"); col += 8 - (col % 8);
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#- if (col == 8) { printf("\t"); col += 8 }
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source = depend("", source, 0)
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n = split(source, list, " +")
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for (i = 2; i <= n; i++) { #(leading whitespace yields empty 1st element)
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if (col + length(list[i]) >= (i < n ? 78 : 80)) {
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printf(" \\\n\t\t"); col = 16 #make a backslash+newline split
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printf("%s", list[i]); col += length(list[i])
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printf("\n") #terminate
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#write build command if first source entry has non-include path prefix
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if (source ~ /\// && substr(source, 1, 11) != "../include/") {
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if (source ~ /\.cpp$/ )
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print "\t$(CXX) $(CXXFLAGS) -c " source
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else if (source ~ /\/gnome\//) # "../win/gnome/foo.c"
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print "\t$(CC) $(CFLAGS) $(GNOMEINC) -c " source
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print "\t$(CC) $(CFLAGS) -c " source
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# recursively add the dependencies for file `name' to string `inout'
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# (unless `skip', in which case we're only marking files as already done)
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function depend(inout, name, skip, n, i, list)
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if (name in alt_deps) { #some names have non-conventional dependencies
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if (!skip) inout = inout " " alt_deps[name]
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} else { #ordinary name
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if (!skip) inout = inout " " name
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#- n = split(deps[name], list, " +")
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#- for (i = 2; i <= n; i++) #(leading whitespace yields empty 1st element)
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#- inout = depend(inout, list[i], skip)
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#+ At least one implementation of nawk handles the local array `list' wrong,
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#+ so the clumsier substitute code below is used as a workaround.
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list = deps[name]; sub("^ +", "", list)
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match((list " "), " +"); i = RSTART; n = RLENGTH
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inout = depend(inout, substr(list, 1, i-1), skip)
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list = substr(list, i+n)
added
removed
sys/unix/depend.awk
