Updating the configuration system of uclibc to something more flexible than it was.

I copied what I had done in busybox.

svn path=/nixpkgs/branches/stdenv-updates/; revision=23310

pkgs/os-specific/linux/uclibc/default.nix

@@ -1,54 +1,72 @@
-{stdenv, fetchurl, linuxHeaders, libiconv, cross ? null, gccCross ? null}:
+{stdenv, fetchurl, linuxHeaders, libiconv, cross ? null, gccCross ? null,
+extraConfig ? ""}:
 
 assert stdenv.isLinux;
 assert cross != null -> gccCross != null;
 
 let
-    enableArmEABI = (cross == null && stdenv.platform.kernelArch == "arm")
+  configParser = ''
-      || (cross != null && cross.arch == "arm");
+    function parseconfig {
+        set -x
+        while read LINE; do
+            NAME=`echo "$LINE" | cut -d \  -f 1`
+            OPTION=`echo "$LINE" | cut -d \  -f 2`
 
-    configArmEABI = if enableArmEABI then
+            if test -z "$NAME"; then
-        ''-e 's/.*CONFIG_ARM_OABI.*//' \
+                continue
-        -e 's/.*CONFIG_ARM_EABI.*/CONFIG_ARM_EABI=y/' '' else "";
+            fi
 
-    enableBigEndian = (cross != null && cross.bigEndian);
+            if test "$NAME" == "CLEAR"; then
-    
+                echo "parseconfig: CLEAR"
-    configBigEndian = if enableBigEndian then ""
+                echo > .config
-      else
+            fi
-        ''-e 's/.*ARCH_BIG_ENDIAN.*/#ARCH_BIG_ENDIAN=y/' \
+
-        -e 's/.*ARCH_WANTS_BIG_ENDIAN.*/#ARCH_WANTS_BIG_ENDIAN=y/' \
+            echo "parseconfig: removing $NAME"
-        -e 's/.*ARCH_WANTS_LITTLE_ENDIAN.*/ARCH_WANTS_LITTLE_ENDIAN=y/' '';
+            sed -i /^$NAME=/d .config
+
+            if test "$OPTION" != n; then
+                echo "parseconfig: setting $NAME=$OPTION"
+                echo "$NAME=$OPTION" >> .config
+            fi
+        done
+        set +x
+    }
+  '';
+
+  archMakeFlag = if (cross != null) then "ARCH=${cross.arch}" else "";
+  crossMakeFlag = if (cross != null) then "CROSS=${cross.config}-" else "";
+
+  nixConfig = ''
+    RUNTIME_PREFIX "/"
+    DEVEL_PREFIX "/"
+    UCLIBC_HAS_WCHAR y
+    UCLIBC_HAS_FTW y
+    UCLIBC_HAS_RPC y
+    DO_C99_MATH y
+    UCLIBC_HAS_PROGRAM_INVOCATION_NAME y
+    KERNEL_HEADERS "${linuxHeaders}/include"
+  '';
 
-    archMakeFlag = if (cross != null) then "ARCH=${cross.arch}" else "";
-    crossMakeFlag = if (cross != null) then "CROSS=${cross.config}-" else "";
 in
 stdenv.mkDerivation {
-  name = "uclibc-0.9.30.3" + stdenv.lib.optionalString (cross != null)
+  name = "uclibc-0.9.31" + stdenv.lib.optionalString (cross != null)
     ("-" + cross.config);
 
   src = fetchurl {
-    url = http://www.uclibc.org/downloads/uClibc-0.9.30.3.tar.bz2;
+    url = http://www.uclibc.org/downloads/uClibc-0.9.31.tar.bz2;
-    sha256 = "0f1fpdwampbw7pf79i64ipj0azk4kbc9wl81ynlp19p92k4klz0h";
+    sha256 = "1yk328fnz0abgh2vm2r68y65ckfkx97rdp8hbg4xvmx5s94kblw0";
   };
 
   # 'ftw' needed to build acl, a coreutils dependency
   configurePhase = ''
     make defconfig ${archMakeFlag}
-    sed -e s@/usr/include@${linuxHeaders}/include@ \
+    ${configParser}
-      -e 's@^RUNTIME_PREFIX.*@RUNTIME_PREFIX="/"@' \
+    cat << EOF | parseconfig
-      -e 's@^DEVEL_PREFIX.*@DEVEL_PREFIX="/"@' \
+    ${nixConfig}
-      -e 's@.*UCLIBC_HAS_WCHAR.*@UCLIBC_HAS_WCHAR=y@' \
+    ${extraConfig}
-      -e 's@.*UCLIBC_HAS_FTW.*@UCLIBC_HAS_FTW=y@' \
+    ${if cross != null then cross.uclibc.extraConfig else ""}
-      -e 's@.*UCLIBC_HAS_RPC.*@UCLIBC_HAS_RPC=y@' \
+    $extraCrossConfig
-      -e 's@.*DO_C99_MATH.*@DO_C99_MATH=y@' \
+    EOF
-      -e 's@.*UCLIBC_HAS_PROGRAM_INVOCATION_NAME.*@UCLIBC_HAS_PROGRAM_INVOCATION_NAME=y@' \
-      -e 's@.*CONFIG_MIPS_ISA_1.*@#CONFIG_MIPS_ISA_1=y@' \
-      -e 's@.*CONFIG_MIPS_ISA_3.*@CONFIG_MIPS_ISA_3=y@' \
-      -e 's@.*CONFIG_MIPS_O32_ABI.*@#CONFIG_MIPS_O32_ABI=y@' \
-      -e 's@.*CONFIG_MIPS_N32_ABI.*@CONFIG_MIPS_N32_ABI=y@' \
-      ${configArmEABI} \
-      ${configBigEndian} \
-      -i .config
     make oldconfig
   '';