List all direct pkg-config dependencies #320
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This is allowed since all cgo pkg-config directives in a package are concatenated and used for all C files in the package. pkg-config directives are left in cairo/cairo.go, gdk/gdk.go, glib/glib.go, gtk/gtk.go; and pango/pango.go is updated to include fontconfig from pango/pango-font.go and pangocairo from pango/pangocairo.go
Based on this output:
cairo.a needs -lcairo-gobject -lcairo -lgobject-2.0
gdk.a needs -lglib-2.0 -lgobject-2.0 -lgdk-3
glib.a needs -lgio-2.0 -lglib-2.0 -lgobject-2.0
gtk.a needs -lgio-2.0 -lglib-2.0 -lgobject-2.0 -lgdk-3 -lgtk-3
pango.a needs -lfontconfig -lgobject-2.0 -lpango-1.0 -lpangocairo-1.0
-lcairo in cairo
-lcairo-gobject in cairo-gobject
-lfontconfig in fontconfig
-lgdk-3 in gdk-3.0 gdk-wayland-3.0 gdk-x11-3.0
-lgio-2.0 in gio-2.0
-lglib-2.0 in glib-2.0
-lgobject-2.0 in gobject-2.0
-lgtk-3 in gtk+-3.0 gtk+-wayland-3.0 gtk+-x11-3.0
-lpango-1.0 in pango
-lpangocairo-1.0 in pangocairo
of the following Bash script (using Nixpkgs):
set -euo pipefail
shopt -s nullglob
go install -v github.com/gotk3/gotk3/...
cd $GOPATH/pkg/linux_amd64/github.com/gotk3/gotk3
pkgs='cairo fontconfig glib gtk3 pango'
args=$(for pkg in $pkgs; do echo "-A $pkg.all"; done)
roots=$(nix-build --no-out-link '<nixpkgs>' $args)
pcs=$(for d in $roots; do echo $d/lib/pkgconfig/*.pc; done)
libs=$(for d in $roots; do echo $d/lib/*.so; done)
allneeded=()
for f in *.a; do
syms=$(nm -o -u "$f" 2>/dev/null | awk '{print $3}' | sort -u)
needed=()
for lib in $libs; do
libsyms=$(nm -o -D --defined-only $lib | awk '{print $3}' | sort -u)
commonsyms=$(comm -1 -2 <(echo "$syms") <(echo "$libsyms"))
if [ "$commonsyms" ]; then
lib=${lib##*/lib}
lib=${lib%.so}
needed+=("-l$lib")
fi
done
echo $f needs ${needed[*]}
allneeded+=(${needed[*]})
done
echo
for lib in $(printf "%s\n" ${allneeded[*]} | sort -u); do
inpcs=$(grep -P -l -- "(:|\s)$lib(\s|\$)" $pcs)
echo $lib in $(for pc in $inpcs; do basename $pc .pc; done)
done
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Fixes #318.
See details in commit descriptions.