debug/gdb: install gdbinit sample file

gdb needs to know where to find the libstdc++ helper python script
to do, well, whatever it has to do with it...

We can't install that in the user's ~/.gdbinit, it's too complex to
handle all the cases. Moreover, if the user is using more than one
toolchain, we can't put all that stuff in there...

Just provide a sample config file the user can adapt to his/her
own needs.

Thanks go to Khem RAJ for providing such a hint:
    http://sourceware.org/ml/crossgcc/2011-07/msg00026.html

Reported-by: ANDY KENNEDY <ANDY.KENNEDY@adtran.com>
CC: Khem Raj <raj.khem@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

scripts/build/debug/300-gdb.sh

@@ -105,6 +105,7 @@ do_debug_gdb_build() {
 
     if [ "${CT_GDB_CROSS}" = "y" ]; then
         local -a cross_extra_config
+        local gcc_version
 
         CT_DoStep INFO "Installing cross-gdb"
         CT_DoLog EXTRA "Configuring cross-gdb"
@@ -149,6 +150,21 @@ do_debug_gdb_build() {
         CT_DoLog EXTRA "Installing cross-gdb"
         CT_DoExecLog ALL make install
 
+        CT_DoLog EXTRA "Install '.gdbinit' template"
+        # See in scripts/build/internals.sh for why we do this
+        if [ -f "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/gcc/BASE-VER" ]; then
+            gcc_version=$( cat "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/gcc/BASE-VER" )
+        else
+            gcc_version=$( sed -r -e '/version_string/!d; s/^.+= "([^"]+)".*$/\1/;' \
+                               "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/gcc/version.c"   \
+                         )
+        fi
+        ${sed} -r                                               \
+               -e "s:@@PREFIX@@:${CT_PREFIX_DIR}:;"             \
+               -e "s:@@VERSION@@:${gcc_version}:;"              \
+               "${CT_LIB_DIR}/scripts/build/debug/gdbinit.in"   \
+               >"${CT_PREFIX_DIR}/share/gdb/gdbinit"
+
         CT_EndStep
     fi
 

scripts/build/debug/gdbinit.in

@@ -0,0 +1,6 @@
+python
+import sys
+sys.path.insert(0, '@@PREFIX@@/share/gcc-@@VERSION@@/python')
+from libstdcxx.v6.printers import register_libstdcxx_printers
+register_libstdcxx_printers (None)
+end