support different gcc search patchs

On many crosscompilers ld/as/etc are not installed in same dir as gcc.
They get run in sb2 without argv mangling. Without mangling -rpath-link
gets not passed, and recursive linking fails.

in sb2-config-gcc-toolchain ask gcc where it searches for progs and
use that list for gcc component path map on argvenvp mapping.

Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Lauri Aarnio <Lauri.Aarnio@iki.fi>

lua_scripts/argvenvp_gcc.lua

@@ -60,16 +60,28 @@ function register_gcc_component_path(tmp, gccrule)
 	-- 2. note that cross_gcc_dir is not empty, this file
 	--    won't be loaded at all if it is (see argvenvp.lua),
 	-- 3. Wrappers for host-* tools live in /sb2/wrappers.
-	if gccrule == nil or gccrule.cross_gcc_dir == nil then
-		tmp.path_prefixes = generic_gcc_tools_path_prefixes
-	else
-		local gcc_tools_path_prefixes = {
-			"/usr/bin/",
-			gccrule.cross_gcc_dir,
-			"/sb2/"
-		}
-		tmp.path_prefixes = gcc_tools_path_prefixes
+	local gcc_tools_path_prefixes = {}
+
+    -- lua array copy wtf
+	for j,x in ipairs(generic_gcc_tools_path_prefixes) do
+		table.insert(gcc_tools_path_prefixes, x)
+	end
+
+	if gccrule == nil then
+		return
 	end
+
+	if gccrule.cross_gcc_dir ~= nil then
+		table.insert(gcc_tools_path_prefixes, gccrule.cross_gcc_dir)
+	end
+
+	if gccrule.cross_gcc_progs_path ~= nil then
+		for path in string.gmatch(gccrule.cross_gcc_progs_path,"[^:]+") do
+			table.insert(gcc_tools_path_prefixes, path)
+		end
+	end
+
+	tmp.path_prefixes = gcc_tools_path_prefixes
 	argvmods[tmp.name] = tmp
 end
 

utils/sb2-config-gcc-toolchain

@@ -94,6 +94,7 @@ gcc_config$gcc_version_id = {
 
 	cross_gcc_prefix_list="$SBOX_CROSS_GCC_PREFIX_LIST",
 	cross_gcc_dir="$SBOX_CROSS_GCC_DIR",
+	cross_gcc_progs_path="$SBOX_CROSS_GCC_PROGS_PATH",
 	cross_gcc_version="$SBOX_CROSS_GCC_VERSION",
 	cross_gcc_shortversion="$SBOX_CROSS_GCC_SHORTVERSION",
 
@@ -257,6 +258,9 @@ else
 	fi
 fi
 
+# Path where gcc searches for sub-tools (ld, as, cc1,..)
+SBOX_CROSS_GCC_PROGS_PATH=$($GCC -print-search-dirs|grep ^programs:|sed 's/programs: =//')
+
 # default for the cross-gcc prefix list:
 # these may be changed by sb2rc.$MAPPING_MODE