clang

unvendor

06/using-nix/2b0-musl.nix

@@ -0,0 +1,45 @@
+{ fetchurl, mkDerivationStage2
+, stage1, static-gnumake, intermediate-clang }:
+
+let
+  source-tarball-musl = fetchurl {
+    # local = /downloads/musl-1.2.4.tar.gz;
+    url = "http://musl.libc.org/releases/musl-1.2.4.tar.gz";
+    sha256 = "7a35eae33d5372a7c0da1188de798726f68825513b7ae3ebe97aaaa52114f039";
+  };
+in
+  mkDerivationStage2 {
+    name = "bootstrap-2b0-musl";
+    buildInputPaths = [
+      "${stage1.protobusybox}/bin"
+      "${static-gnumake}/bin"
+      "${intermediate-clang}/bin"
+      "${intermediate-clang}/bin/generic-names"
+    ];
+    script = ''
+      # unpack:
+        mkdir build-dir; cd build-dir
+        unpack ${source-tarball-musl}
+      # fixup:
+        sed -i 's|/bin/sh|${stage1.protobusybox}/bin/ash|' tools/*.sh \
+        # patch popen/system to search in PATH instead of hardcoding /bin/sh
+        sed -i 's|posix_spawn(&pid, "/bin/sh",|posix_spawnp(\&pid, "sh",|' \
+                src/stdio/popen.c src/process/system.c
+        sed -i 's|execl("/bin/sh", "sh", "-c",|execlp("sh", "-c",|'\
+                src/misc/wordexp.c
+        # avoid absolute path references
+        sed -i 's/__FILE__/__FILE_NAME__/' include/assert.h
+      # configure:
+        ash ./configure --prefix=$out CFLAGS=-O2
+      # build:
+        make -j $NPROC
+      # install:
+        make -j $NPROC install
+        mkdir $out/bin
+        ln -s $out/lib/libc.so $out/bin/ldd
+      # check for build path leaks:
+        ( ! grep -rF $(pwd) $out )
+    '';
+    extra.allowedRequisites = [ "out" ];
+    extra.allowedReferences = [ "out" ];
+  }