[OE-core] [sumo][PATCH 3/7] icecc-create-env: Fix library interpreter usage

[Joshua Watt]

Shared libraries sometimes (frequently?) don't have a program
interpreter specified. The previous code would fail to find the library
dependencies in these cases because no interpreter could be found.
Commonly, this meant that if a library depends on another library, it
might not be included toolchain because dependency scanning stops with
the first one.

Instead, capture the program interpreter from the program or library
that starts the dependency chain and use that interpreter to get all of
the dependencies in the chain, recursively.

Additionally, if no interpreter can be found, fallback to using ldd

Signed-off-by: Joshua Watt <JPEWhacker at gmail.com>
---
 .../icecc-create-env/icecc-create-env              | 112 ++++++++++++++-------
 1 file changed, 77 insertions(+), 35 deletions(-)

diff --git a/meta/recipes-devtools/icecc-create-env/icecc-create-env/icecc-create-env b/meta/recipes-devtools/icecc-create-env/icecc-create-env/icecc-create-env
index 3015f4e2155..b88c53a424b 100755
--- a/meta/recipes-devtools/icecc-create-env/icecc-create-env/icecc-create-env
+++ b/meta/recipes-devtools/icecc-create-env/icecc-create-env/icecc-create-env
@@ -99,48 +99,90 @@ normalize_path ()
     echo $path
 }
 
-add_file ()
+add_file_common()
+{
+    local p="$1"
+    local path="$2"
+    local alias="$3"
+
+    add_alias "$path" "$p"
+    if test -n "$alias"; then
+        add_alias "$path" "$alias"
+    fi
+
+    add_path "$path" || return 1
+    print_debug "Adding file '$path'"
+
+    return 0
+}
+
+add_deps()
+{
+    local path="$1"
+    local interp="$2"
+
+    if test -n "$interp" && test -x "$interp"; then
+        # Use the dynamic loaders --list argument to list the
+        # dependencies. The program may have a different program
+        # interpreter (typical when using uninative tarballs), which is
+        # why we can't just call ldd.
+        deps="`$interp --list "$path"`"
+    else
+        deps="`ldd "$path"`"
+    fi
+
+    print_debug "Dependencies are:"
+    print_debug "$deps"
+    if test -n "$deps"; then
+        for lib in $deps; do
+            # ldd now outputs ld as /lib/ld-linux.so.xx on current nptl
+            # based glibc this regexp parse the outputs like:
+            # ldd /usr/bin/gcc
+            #         linux-gate.so.1 =>  (0xffffe000)
+            #         libc.so.6 => /lib/tls/libc.so.6 (0xb7e81000)
+            #         /lib/ld-linux.so.2 (0xb7fe8000)
+            # covering both situations ( with => and without )
+            lib="`echo "$lib" | sed -n 's,^[^/]*\(/[^ ]*\).*,\1,p'`"
+
+            test -f "$lib" || continue
+            # Check whether the same library also exists in the parent
+            # directory, and prefer that on the assumption that it is a
+            # more generic one.
+            local baselib=`echo "$lib" | sed 's,\(/[^/]*\)/.*\(/[^/]*\)$,\1\2,'`
+            test -f "$baselib" && lib=$baselib
+            add_dependency "$lib" "$interp"
+        done
+    fi
+}
+
+add_dependency()
 {
     local p=`normalize_path $1`
     # readlink is required for Yocto, so we can use it
     local path=`readlink -f "$p"`
+    local interp="$2"
 
-    add_alias "$path" "$p"
-    if test -n "$2"; then
-        add_alias "$path" "$2"
+    add_file_common "$p" "$path" || return
+
+    if test -x "$path" && is_dynamic_elf "$path"; then
+        add_deps "$path" "$interp"
     fi
+}
 
-    add_path "$path" || return
-
-    if test -x "$path"; then
-        # Only call ldd when it makes sense
-        if is_dynamic_elf "$path"; then
-            # Request the program interpeter (dynamic loader)
-            interp=`readelf -w -l "$path" | grep "Requesting program interpreter:" | sed "s/\s*\[Requesting program interpreter:\s*\(.*\)\]/\1/g"`
-
-            if test -n "$interp" && test -x "$interp"; then
-                # Use the dynamic loaders --list argument to list the
-                # depenencies. The program may have a a different program
-                # interpeter (typical when using uninative tarballs), which is
-                # why we can't just call ldd.
-                #
-                # ldd now outputs ld as /lib/ld-linux.so.xx on current nptl based glibc
-                # this regexp parse the outputs like:
-                # ldd /usr/bin/gcc
-                #         linux-gate.so.1 =>  (0xffffe000)
-                #         libc.so.6 => /lib/tls/libc.so.6 (0xb7e81000)
-                #         /lib/ld-linux.so.2 (0xb7fe8000)
-                # covering both situations ( with => and without )
-                for lib in `$interp --list "$path" | sed -n 's,^[^/]*\(/[^ ]*\).*,\1,p'`; do
-                    test -f "$lib" || continue
-                    # Check wether the same library also exists in the parent directory,
-                    # and prefer that on the assumption that it is a more generic one.
-                    local baselib=`echo "$lib" | sed 's,\(/[^/]*\)/.*\(/[^/]*\)$,\1\2,'`
-                    test -f "$baselib" && lib=$baselib
-                    add_file "$lib"
-                done
-            fi
-        fi
+add_file ()
+{
+    local p=`normalize_path $1`
+    # readlink is required for Yocto, so we can use it
+    local path=`readlink -f "$p"`
+
+    add_file_common "$p" "$path" "$2" || return
+
+    if test -x "$path" && is_dynamic_elf "$path"; then
+        # Request the program interpeter (dynamic loader)
+        interp=`readelf -W -l "$path" | grep "Requesting program interpreter:" | sed "s/\s*\[Requesting program interpreter:\s*\(.*\)\]/\1/g"`
+        print_debug "Interpreter is '$interp'"
+
+        add_deps "$path" "$interp"
     fi
 }
 
-- 
2.14.3