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[devel] Freeze build-time only configuration in the build.

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In all prior versions of libpng most configuration options
    controlled by compiler #defines had to be repeated by the
    application code that used libpng.  This patch changes this
    so that compilation options that can only be changed at build
    time are frozen in the build.  Options that are compiler
    dependent (and those that are system dependent) are evaluated
    each time - pngconf.h holds these.  Options that can be changed
    per-file in the application are in png.h.  Frozen options are
    in the new installed header file pnglconf.h
This commit is contained in:
Glenn Randers-Pehrson
2010-04-16 22:12:51 -05:00
parent 3cd7cffd0c
commit 862cb20ea6
18 changed files with 1459 additions and 1088 deletions
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59
scripts/checksym.awk
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@@ -33,7 +33,7 @@ master == "" {
}
FILENAME==master && NF==2 && $2~/^@/ && $1!~/^;/ {
o=0+substr($2,2)
if (o >0) {
if (o > 0) {
if (official[o] == "") {
official[o] = $1
if (o > mastero) mastero = o
@@ -51,13 +51,14 @@ FILENAME==master {
# Read new definitions, these are free form but the lines must
# just be symbol definitions. Lines will be commented out for
# 'removed' symbols, introduced in png.h using PNG_REMOVED rather
# than PNG_EXPORT. Use checksym.dfn to generate the input file.
# than PNG_EXPORT. Use symbols.dfn or pngwin.dfn to generate the
# input file.
#
# symbol ordinal # two fields, exported symbol
# ; symbol ordinal # three fields, removed symbol
# ; ordinal # two fields, the last ordinal
NF==2 && $1 == ";" && $2 ~ /^[1-9][0-9]*$/ { # last ordinal
o = 0+$2
# symbol @ordinal # two fields, exported symbol
# ; symbol @ordinal # three fields, removed symbol
# ; @ordinal # two fields, the last ordinal
NF==2 && $1 == ";" && $2 ~ /^@[1-9][0-9]*$/ { # last ordinal
o=0+substr($2,2)
if (lasto == 0 || lasto == o)
lasto=o
else {
@@ -66,8 +67,8 @@ NF==2 && $1 == ";" && $2 ~ /^[1-9][0-9]*$/ { # last ordinal
}
next
}
NF==3 && $1 == ";" && $3 ~ /^[1-9][0-9]*$/ { # removed symbol
o = 0+$3
NF==3 && $1 == ";" && $3 ~ /^@[1-9][0-9]*$/ { # removed symbol
o=0+substr($3,2)
if (removed[o] == "" || removed[o] == $2) {
removed[o] = $2
if (o > symbolo) symbolo = o
@@ -78,8 +79,8 @@ NF==3 && $1 == ";" && $3 ~ /^[1-9][0-9]*$/ { # removed symbol
}
next
}
NF==2 && $2 ~ /^[1-9][0-9]*$/ { # exported symbol
o = 0+$2
NF==2 && $2 ~ /^@[1-9][0-9]*$/ { # exported symbol
o=0+substr($2,2)
if (symbol[o] == "" || symbol[o] == $1) {
symbol[o] = $1
if (o > symbolo) symbolo = o
@@ -105,36 +106,38 @@ END{
mastero ", exceeds last ordinal from png.h", lasto
err = 1
}
missing = 0
unexported=0
for (o=1; o<=lasto; ++o) {
stop=0
if (symbol[o] == "" && removed[o] == "") {
if (missing == 0) missing = o
if (o < lasto) continue
stop=1
if (unexported == 0) unexported = o
if (official[o] == "") {
# missing in export list too, so ok
if (o < lasto) continue
}
}
if (missing != 0) {
if (o-1 > missing)
print "png.h: missing symbol definitions:", missing "-" o-1
if (unexported != 0) {
# Symbols in the .def but not in the new file are errors
if (o-1 > unexported)
print "png.h: warning: unexported symbol definitions:",
unexported "-" o-1
else
print "png.h: missing symbol definition:", missing
missing = 0
err = 1
print "png.h: warning: unexported symbol definition:",
unexported
unexported = 0
}
if (stop == 1) break; # lasto is missing
if (symbol[o] != "" && removed[o] != "") {
print "png.h: symbol", o,
"both exported as '" symbol[o] "' and removed as '" removed[o] "'"
err = 1
} else if (symbol[o] != official[o]) {
# either master symbol not there or it changed
# either the symbol is missing somewhere or it changed
err = 1
if (symbol[o] == "")
print "png.h: removed symbol", o,
"'" symbol[o] "' exported as '" official[o] "' in", master
print "png.h: symbol", o,
"is exported as '" official[o] "' in", master
else if (official[o] == "")
print "png.h: exported symbol", o, "'" symbol[o] "' not present in",
master
print "png.h: exported symbol", o,
"'" symbol[o] "' not present in", master
else
print "png.h: exported symbol", o,
"'" symbol[o] "' exists as '" official[o] "' in", master