scripts/xldd: better find sysroot with old gcc

Only starting with 4.4 does gcc have a -print-sysroot option.
For 4.3 or before, we have to play some tricks:
- ask gcc where libc.so is,
  (we expect it in ${sysroot}/usr/lib/libc.so)
- trim /usr/lib/libc.so from the result

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from aa2305c5b2a57fbcda9a1b5bb5fb3a476ac49a13)

1 files changed, 9 insertions, 1 deletions

diff --git a/scripts/xldd.in b/scripts/xldd.in
index 30077ad6..65cfa304 100755
--- a/scripts/xldd.in
+++ b/scripts/xldd.in
@@ -132,7 +132,15 @@ if [ ! -d "${root}" ]; then
     exit 1
 fi
 
-sysroot="$( "${gcc}" -print-sysroot )"
+sysroot="$( "${gcc}" -print-sysroot 2>/dev/null )"
+if [ -z "${sysroot}" ]; then
+    sysroot="$( "${gcc}" -print-file-name=libc.so 2>/dev/null   \
+                |sed -r -e 's:/usr/lib/libc.so$::;'             \
+              )"
+fi
+if [ -z "${sysroot}" ]; then
+    do_error "unable to find sysroot for \`${gcc}'"
+fi
 
 do_report_needed_found() {
     local needed="${1}"