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# This is an awk script which does dependencies. We do NOT want it to
# recursively follow #include directives.
#
# The HPATH environment variable should be set to indicate where to look
# for include files. The -I in front of the path is optional.
#
# Surely there is a more elegant way to see if a file exists. Anyone know
# what it is?
#
function fileExists(f, TMP, dummy, result) {
if(result=FILEHASH[f]) {
if(result=="Yes") {
return "Yes"
} else {return ""}
}
ERRNO = getline dummy < f
if(ERRNO >= 0) {
close(f)
return FILEHASH[f]="Yes"
} else {
FILEHASH[f]="No"
return ""
}
}
function endfile(f) {
if (hasconfig && !needsconfig) {
printf "%s doesn't need config\n",f > "/dev/stderr"
}
if (hasdep) {
print cmd
}
}
BEGIN{
hasdep=0
hasconfig=0
needsconfig=0
incomment=0
if(!(TOPDIR=ENVIRON["TOPDIR"])) {
print "Environment variable TOPDIR is not set"
exit 1
}
split(ENVIRON["HPATH"],parray," ")
for(path in parray) {
sub("^-I","",parray[path])
sub("[/ ]*$","",parray[path])
}
}
# eliminate comments
{
# remove all comments fully contained on a single line
gsub("\\/\\*.*\\*\\/", "")
if (incomment) {
if ($0 ~ /\*\//) {
incomment = 0;
gsub(".*\\*\\/", "")
} else {
next
}
} else {
# start of multi-line comment
if ($0 ~ /\/\*/)
{
incomment = 1;
sub("\\/\\*.*", "")
} else if ($0 ~ /\*\//) {
incomment = 0;
sub(".*\\*\\/", "")
}
}
}
/^[ ]*#[ ]*if.*[^A-Za-z_]CONFIG_/ {
needsconfig=1
if (!hasconfig) {
printf "%s needs config but has not included config file\n",FILENAME > "/dev/stderr"
# only say it once per file..
hasconfig = 1
}
}
/^[ ]*#[ ]*include[ ]*[<"][^ ]*[>"]/{
found=0
if(LASTFILE!=FILENAME) {
endfile(LASTFILE)
hasdep=0
hasconfig=0
needsconfig=0
incomment=0
cmd=""
LASTFILE=FILENAME
depname=FILENAME
relpath=FILENAME
sub("\\.c$",".o: ",depname)
sub("\\.S$",".o: ",depname)
if (depname==FILENAME) {
cmd="\n\t@touch "depname
}
sub("\\.h$",".h: ",depname)
if(relpath ~ "^\\." ) {
sub("[^/]*$","", relpath)
relpath=relpath"/"
sub("//","/", relpath)
} else {
relpath=""
}
}
fname=$0
sub("^#[ ]*include[ ]*[<\"]","",fname)
sub("[>\"].*","",fname)
if (fname=="linux/config.h") {
hasconfig=1
}
rfname=relpath""fname
if(fileExists(rfname)) {
found=1
if (!hasdep) {
printf "%s", depname
}
hasdep=1
printf " \\\n %s", rfname
if(fname ~ "^\\." ) {
fnd=0;
for(i in ARGV) {
if(ARGV[i]==rfname) {
fnd=1
}
}
if(fnd==0) {
ARGV[ARGC]=rfname
++ARGC
}
}
} else {
for(path in parray) {
if(fileExists(parray[path]"/"fname)) {
shortp=parray[path]
found=1
if (!hasdep) {
printf "%s", depname
}
hasdep=1
printf " \\\n %s", parray[path]"/"fname
}
}
}
}
END{
endfile(FILENAME)
}
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