#!/usr/bin/env perl
#
-# Copyright © 2011 Nick Bowler
+# Copyright © 2011-2012 Nick Bowler
#
# Prepare the Gnulib tree for inclusion into a non-recursive automake build.
+# While the output of gnulib-tool is "include"-able if the --makefile-name
+# option is used, it is still not suitable for non-recursive use for a couple
+# reasons; chief among them is that filenames are not relative to the top
+# source directory.
+#
+# This script postprocesses the gnulib-tool output to produce something that
+# is intended to be suitable for inclusion into such non-recursive build
+# environments. Since the integration involves both configure.ac and
+# Makefile.am, the output must be included into _both_. Supposing the output
+# is written to lib/gnulib.mk, you would add:
+#
+# m4_include([lib/gnulib.mk]) # to configure.ac, after any call to gl_INIT
+# include $(top_srcdir)/lib/gnulib.mk # to Makefile.am
+#
+# You must also arrange for the Gnulib-generated header files to be built
+# before the object files which depend on them; the most robust way to do this
+# is by explicit prerequisites, for example:
+#
+# bin_PROGRAMS = foo
+# $(foo_OBJECTS): $(gnulib_headers)
+#
+# The $(gnulib_headers) variable will expand to GNU-make order-only
+# prerequisites when available, avoiding spurious incremental rebuilds when
+# unused headers are changed. If this feature is not available, it will
+# expand to ordinary prerequisites. It is therefore only appropriate for use
+# in target prerequisites; the $(gnulib_raw_headers) variable may be used in
+# other contexts when only the list of header files is required.
+#
+# This script also provides machinery for Gnulib symbol renaming via the
+# glconfig.mk Makefile.am snippet; use of this feature is optional.
+#
+# Most of the specific transformations are documented below.
#
# License WTFPL2: Do What The Fuck You Want To Public License, version 2.
# This is free software: you are free to do what the fuck you want to.
my $output = undef;
my $input = undef;
-my $m4output = undef;
-my $m4macro = "DX_FIX_GNULIB";
+
+my $line = 0;
Getopt::Long::Configure("gnu_getopt", "no_auto_abbrev");
GetOptions(
"o|output=s" => \$output,
"i|input=s" => \$input,
- "m|m4output=s" => \$m4output,
- "M|m4macro=s" => \$m4macro,
);
open STDOUT, ">", $output or die "$output: $!\n" if (defined $output);
# Fix up things that look like filenames.
$word = "lib/$word";
} else {
- print STDERR "$0: warning: unrecognized source file: $word\n";
+ print STDERR "$0:$line: warning: unrecognized source file: $word\n";
}
return "$word";
sub mangle_variable {
my $raw = shift;
- $raw =~ /([^=]+=)[[:space:]]*(.*)/;
+ $raw =~ /([^=]+=)[[:space:]]*(.*)/s;
my ($left, @right) = ($1, split(/[[:space:]]+/, $2));
return join(" ", ($left, map(mangle_file($_), @right))) . "\n";
sub mangle_target {
my $raw = shift;
- $raw =~ /([^:]+):[[:space:]]*(.*)/;
+ $raw =~ /([^:]+):[[:space:]]*(.*)/s;
my @left = split(/[[:space:]]+/, $1);
my @right = split(/[[:space:]]+/, $2);
}
while (<STDIN>) {
+ $line++;
+
+ # Combine line splices.
+ while (s/\\$//) {
+ $line++;
+ $_ = $_ . <STDIN>
+ }
+
next if (/^#/);
if (!$printed_header) {
print "# Postprocessed by ", basename($0), "\n\n";
print <<'EOF';
+# BEGIN AUTOMAKE/M4 POLYGLOT \
+m4_unquote(m4_argn([2], [
+.PHONY: # Automake code follows
+
# This trick should define gnulib_orderonly to | iff we're using GNU make.
gnulib_have_orderonly = $(findstring order-only,$(.FEATURES))
gnulib_orderonly = $(gnulib_have_orderonly:order-only=|)
-gnulib_core_headers = $(gnulib_orderonly)
-gnulib_src_headers = $(gnulib_core_headers)
-gnulib_headers = $(gnulib_src_headers)
+gnulib_core_headers =
+gnulib_raw_headers = $(gnulib_core_headers)
+gnulib_headers = $(gnulib_orderonly) $(gnulib_raw_headers)
EOF
$printed_header = 1;
# useful for non-recursive builds. Strip them out.
drop if (/^(AM_CPPFLAGS|AM_CFLAGS)/);
+ # Library dependencies are added automatically to libgnu.la by
+ # gnulib-tool. Unfortunately, this means that everything linking
+ # against libgnu.la is forced to pull in the same deps, even if they're
+ # unneeded. Furthermore, a libtool linker flag reordering bug prevents
+ # --as-needed from stripping out the useless deps, so it's better to
+ # handle them all manually.
+ drop if (/LDFLAGS/);
+
# Rewrite automake hook targets to be more generic.
if (s/^(.*)-local:/\1-gnulib:/) {
print ".PHONY: $1-gnulib\n";
# Targets are similar to variables: the target and its dependencies
# need to be mangled.
- if (/:/) {
+ if (/^[^\t].*:/) {
$_ = mangle_target($_);
}
# Finally, references to $(srcdir) and $(builddir) need to be fixed up.
s:\$\(srcdir\):\$\(top_srcdir\)/lib:g;
s:\$\(builddir\):\$\(top_builddir\)/lib:g;
-} continue { print };
+} continue { s/(\n.)/\\\1/g; print; };
print <<'EOF';
gnulib_lt_objects = $(libgnu_la_OBJECTS) $(gl_LTLIBOBJS)
-$(gnulib_lt_objects): $(gnulib_src_headers)
+$(gnulib_lt_objects): $(gnulib_headers)
EOF
print @cleanfiles;
# prepend lib/ if and only if they're not empty. Unfortunately, make is not
# powerful to do this, so we need to put this transformation into configure
# itself by defining a new autoconf macro.
-if (defined $m4output) {
- my $lc = List::Compare->new('-u', '-a', \%sourcevars, \%allvars);
- my @vars = $lc->get_unique;
-
- open(M4OUT, '>', $m4output) or die "$m4output: $!\n";
-
- print M4OUT <<EOF;
-dnl This file was generated by fix-gnulib.pl
-dnl
-dnl Usage: DX_FIX_GNULIB([symbol-prefix])
-dnl where symbol-prefix is the application-specific symbol prefix to apply
-dnl to Gnulib's symbols. Defaults to \${PACKAGE}__.
-dnl top-level source directory; e.g. lib.
-AC_DEFUN([$m4macro], [dnl
-EOF
- print M4OUT <<'EOF';
-GLSRC=lib
-GLSYM_PREFIX='ifelse([$1], [], [${PACKAGE}__], [$1])'
-AC_SUBST([GLSRC])
-AC_SUBST([GLSYM_PREFIX])
+
+my $lc = List::Compare->new('-u', '-a', \%sourcevars, \%allvars);
+my @vars = $lc->get_unique;
+
+print <<'EOF';
+if FALSE
+], [dnl M4 code follows
+
+AC_SUBST([GLSRC], [lib])
+AC_DEFUN_ONCE([DX_GLSYM_PREFIX], [AC_SUBST([GLSYM_PREFIX], [$1])])
+AC_CONFIG_COMMANDS_PRE([DX_GLSYM_PREFIX([${PACKAGE}__])])
m4_foreach([gl_objvar], [[gl_LIBOBJS], [gl_LTLIBOBJS]], [dnl
set x $gl_objvar; shift
done
])
EOF
- foreach (@vars) {
- print M4OUT "$_=\${$_:+lib/\$$_}\n";
- }
- print M4OUT "])\n";
- close M4OUT;
+foreach (@vars) {
+ print "$_=\${$_:+lib/\$$_}\n";
}
+
+print <<'EOF';
+], [
+endif
+# ]))dnl
+# END AUTOMAKE/M4 POLYGLOT
+EOF
projects / cdecl99.git / blobdiff