abuild: add function for getting the libc

use whatever the abuild functions.sh says it is

1 files changed, 16 insertions, 6 deletions

diff --git a/aports/abuild.lua b/aports/abuild.lua
index 50f0d3d..805bdb9 100644
--- a/aports/abuild.lua
+++ b/aports/abuild.lua
@@ -23,19 +23,29 @@ function M.get_conf(var)
 	return abuild_conf[var]
 end
 
-function M.get_arch()
-	if abuild_conf.CARCH then
-		return abuild_conf.CARCH
+local function get_cached_var(var)
+	if abuild_conf[var] then
+		return abuild_conf[var]
 	end
-	local f = io.popen(" . "..M.functions..' ; echo -n "$CARCH"')
-	abuild_conf.CARCH = f:read("*all")
+	local f = io.popen((' . %s ; echo -n "$%s"'):format(M.functions, var))
+	abuild_conf[var] = f:read("*all")
 	f:close()
-	return abuild_conf.CARCH
+	return abuild_conf[var]
+end
+
+function M.get_arch()
+	return get_cached_var("CARCH")
+end
+
+function M.get_libc()
+	return get_cached_var("CLIBC")
 end
 
 M.arch = M.get_arch()
+M.libc = M.get_libc()
 M.repodest = M.get_conf("REPODEST")
 M.pkgdest = M.get_conf("PKGDEST")
 M.chost = M.get_conf("CHOST")
 
+
 return M