* A function to build libraries.

* The linker can link against libraries.
* C flags can be passed to the C compiler.

lib/compile-c.sh

@@ -70,4 +70,4 @@ fi
 
 mkdir $out
 test "$prefix" && cd $prefix
-gcc -Wall -c $mainName -o $out/$mainName.o
+gcc -Wall $cFlags -c $mainName -o $out/$mainName.o

lib/default.nix

@@ -2,15 +2,19 @@ rec {
 
   inherit (import /home/eelco/nixpkgs/pkgs/system/i686-linux.nix) stdenv;
 
-  compileC = {main, localIncludes ? []}: stdenv.mkDerivation {
+  compileC = {main, localIncludes ? [], cFlags ? ""}: stdenv.mkDerivation {
     name = "compile-c";
     builder = ./compile-c.sh;
     localIncludes =
       if localIncludes == "auto" then
-        import (findIncludes {main = toString main; hack = curTime;})
+        import (findIncludes {
+          main = toString main;
+          hack = curTime;
+          inherit cFlags;
+        })
       else
         localIncludes;
-    inherit main;
+    inherit main cFlags;
   };
 
   /*
@@ -21,16 +25,22 @@ rec {
   };
   */
 
-  findIncludes = {main, hack}: stdenv.mkDerivation {
+  findIncludes = {main, hack, cFlags ? ""}: stdenv.mkDerivation {
     name = "find-includes";
     builder = ./find-includes.sh;
-    inherit main hack;
+    inherit main hack cFlags;
   };
   
-  link = {objects, programName ? "program"}: stdenv.mkDerivation {
+  link = {objects, programName ? "program", libraries ? []}: stdenv.mkDerivation {
     name = "link";
     builder = ./link.sh;
-    inherit objects programName;
+    inherit objects programName libraries;
+  };
+
+  makeLibrary = {objects, libraryName ? []}: stdenv.mkDerivation {
+    name = "library";
+    builder = ./make-library.sh;
+    inherit objects libraryName;
   };
 
 }

lib/find-includes.sh

@@ -5,7 +5,7 @@ echo "finding includes of \`$(basename $main)'..."
 makefile=$NIX_BUILD_TOP/makefile
 
 mainDir=$(dirname $main)
-(cd $mainDir && gcc -MM $(basename $main) -MF $makefile) || false
+(cd $mainDir && gcc $cFlags -MM $(basename $main) -MF $makefile) || false
 
 echo "[" >$out
 

lib/link.sh

@@ -1,12 +1,19 @@
 . $stdenv/setup
 
 objs=
-for i in "$objects"; do
+for i in $objects; do
     obj=$(echo $i/*.o)
     objs="$objs $obj"
 done
 
+libs=
+for i in $libraries; do
+    lib=$(echo $i/*.a)
+    name=$(echo $(basename $lib) | sed -e 's/^lib//' -e 's/.a$//')
+    libs="$libs -L$(dirname $lib) -l$name" 
+done
+
 echo "linking object files into \`$programName'..."
 
 mkdir $out
-gcc -o $out/$programName $objs
+gcc -o $out/$programName $objs $libs

lib/make-library.sh

@@ -0,0 +1,15 @@
+. $stdenv/setup
+
+objs=
+for i in $objects; do
+    obj=$(echo $i/*.o)
+    objs="$objs $obj"
+done
+
+echo "archiving object files into library \`$libraryName'..."
+
+outPath=$out/lib${libraryName}.a
+
+mkdir $out
+ar crs $outPath $objs
+ranlib $outPath