ver_linux: Query ld cache for versions of libc/libcpp run-time

Query ld cache for versions of both libc and libcpp run-time, instead
of querying /proc/self/maps for libc run-time, and ld cache for libcpp
run-time, thus reducing code size and complexity.

Signed-off-by: Alexander Kapshuk <alexander.kapshuk@gmail.com>
Link: https://lore.kernel.org/r/20200209140057.20181-1-alexander.kapshuk@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/scripts/ver_linux b/scripts/ver_linux
index 85005d6..0968a30 100755 (executable)
--- a/scripts/ver_linux
+++ b/scripts/ver_linux
@@ -14,6 +14,8 @@ BEGIN {
        printf("\n")
 
        vernum = "[0-9]+([.]?[0-9]+)+"
+       libc = "libc[.]so[.][0-9]+$"
+       libcpp = "(libg|stdc)[+]+[.]so[.][0-9]+$"
 
        printversion("GNU C", version("gcc -dumpversion"))
        printversion("GNU Make", version("make --version"))
@@ -35,26 +37,14 @@ BEGIN {
        printversion("Bison", version("bison --version"))
        printversion("Flex", version("flex --version"))
 
-       while (getline <"/proc/self/maps" > 0) {
-               if (/libc.*\.so$/) {
-                       n = split($0, procmaps, "/")
-                       if (match(procmaps[n], vernum)) {
-                               ver = substr(procmaps[n], RSTART, RLENGTH)
-                               printversion("Linux C Library", ver)
-                               break
-                       }
-               }
+       while ("ldconfig -p 2>/dev/null" | getline > 0) {
+               if ($NF ~ libc && !seen[ver = version("readlink " $NF)]++)
+                       printversion("Linux C Library", ver)
+               else if ($NF ~ libcpp && !seen[ver = version("readlink " $NF)]++)
+                       printversion("Linux C++ Library", ver)
        }
 
        printversion("Dynamic linker (ldd)", version("ldd --version"))
-
-       while ("ldconfig -p 2>/dev/null" | getline > 0) {
-               if (/(libg|stdc)[+]+\.so/) {
-                       libcpp = $NF
-                       break
-               }
-       }
-       printversion("Linux C++ Library", version("readlink " libcpp))
        printversion("Procps", version("ps --version"))
        printversion("Net-tools", version("ifconfig --version"))
        printversion("Kbd", version("loadkeys -V"))