add modified gcc-wrapper

svn path=/nixpkgs/branches/nixos-pkgs/; revision=1793

pkgs/build-support/gcc-wrapper/builder.sh

@@ -9,8 +9,12 @@ if test -z "$nativeGlibc"; then
     # against the crt1.o from our own glibc, rather than the one in
     # /usr/lib.  The real solution is of course to prevent those paths
     # from being used by gcc in the first place.
+    # The dynamic linker is passed in `ldflagsBefore' to allow
+    # explicit overrides of the dynamic linker by callers to gcc/ld
+    # (the *last* value counts, so ours should come first).
     cflagsCompile="$cflagsCompile -B$glibc/lib -isystem $glibc/include"
-    ldflags="$ldflags -L$glibc/lib -dynamic-linker $glibc/lib/ld-linux.so.2"
+    ldflags="$ldflags -L$glibc/lib"
+    ldflagsBefore="-dynamic-linker $glibc/lib/ld-linux.so.2"
 fi
 
 if test -n "$nativeTools"; then
@@ -57,6 +61,7 @@ ln -s g77 $out/bin/f77
 sed \
     -e "s^@out@^$out^g" \
     -e "s^@ldflags@^$ldflags^g" \
+    -e "s^@ldflagsBefore@^$ldflagsBefore^g" \
     -e "s^@ld@^$ldPath/ld^g" \
     -e "s^@shell@^$shell^g" \
     < $ldWrapper > $out/bin/ld
@@ -71,6 +76,7 @@ cat > $out/nix-support/add-flags <<EOF
 export NIX_CFLAGS_COMPILE="$cflagsCompile \$NIX_CFLAGS_COMPILE"
 export NIX_CFLAGS_LINK="$cflagsLink \$NIX_CFLAGS_LINK"
 export NIX_LDFLAGS="$ldflags \$NIX_LDFLAGS"
+export NIX_LDFLAGS_BEFORE="$ldflagsBefore \$NIX_LDFLAGS_BEFORE"
 export NIX_GLIBC_FLAGS_SET=1
 EOF
 

pkgs/build-support/gcc-wrapper/default.nix

@@ -11,7 +11,7 @@
 
 assert nativeTools -> nativePrefix != "";
 assert !nativeTools -> gcc != null && binutils != null;
-assert !nativeGlibc -> glibc != null;
+#assert !nativeGlibc -> glibc != null;
 
 stdenv.mkDerivation {
   builder = ./builder.sh;

pkgs/build-support/gcc-wrapper/gcc-wrapper.sh

@@ -63,24 +63,28 @@ fi
 
 
 # Add the flags for the C compiler proper.
-extra=($NIX_CFLAGS_COMPILE)
+extraAfter=($NIX_CFLAGS_COMPILE)
+extraBefore=()
 
 if test "$dontLink" != "1"; then
 
     # Add the flags that should only be passed to the compiler when
     # linking.
-    extra=(${extra[@]} $NIX_CFLAGS_LINK)
+    extraAfter=(${extraAfter[@]} $NIX_CFLAGS_LINK)
 
     # Add the flags that should be passed to the linker (and prevent
     # `ld-wrapper' from adding NIX_LDFLAGS again).
+    for i in $NIX_LDFLAGS_BEFORE; do
+        extraBefore=(${extraBefore[@]} "-Wl,$i")
+    done
     for i in $NIX_LDFLAGS; do
-        extra=(${extra[@]} "-Wl,$i")
+        extraAfter=(${extraAfter[@]} "-Wl,$i")
     done
     export NIX_LDFLAGS_SET=1
 
     if test "$NIX_STRIP_DEBUG" = "1"; then
         # Add executable-stripping flags.
-        extra=(${extra[@]} $NIX_CFLAGS_STRIP)
+        extraAfter=(${extraAfter[@]} $NIX_CFLAGS_STRIP)
     fi
 fi
 
@@ -90,8 +94,12 @@ if test "$NIX_DEBUG" = "1"; then
   for i in "${params[@]}"; do
       echo "  $i" >&2
   done
-  echo "extra flags to @gcc@:" >&2
-  for i in ${extra[@]}; do
+  echo "extraBefore flags to @gcc@:" >&2
+  for i in ${extraBefore[@]}; do
+      echo "  $i" >&2
+  done
+  echo "extraAfter flags to @gcc@:" >&2
+  for i in ${extraAfter[@]}; do
       echo "  $i" >&2
   done
 fi
@@ -100,4 +108,4 @@ if test -n "$NIX_GCC_WRAPPER_EXEC_HOOK"; then
     . "$NIX_GCC_WRAPPER_EXEC_HOOK"
 fi
 
-exec @gcc@ "${params[@]}" ${extra[@]}
+exec @gcc@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}

pkgs/build-support/gcc-wrapper/ld-wrapper.sh

@@ -42,9 +42,11 @@ fi
 
 
 extra=()
+extraBefore=()
 
 if test -z "$NIX_LDFLAGS_SET"; then
     extra=(${extra[@]} $NIX_LDFLAGS)
+    extraBefore=(${extraBefore[@]} $NIX_LDFLAGS_BEFORE)
 fi
 
 
@@ -141,4 +143,4 @@ if test -n "$NIX_LD_WRAPPER_EXEC_HOOK"; then
     . "$NIX_LD_WRAPPER_EXEC_HOOK"
 fi
 
-exec @ld@ "${params[@]}" ${extra[@]}
+exec @ld@ ${extraBefore[@]} "${params[@]}" ${extra[@]}