Define "brokenRedHatKernel = true" in $NIXPKGS_CONFIG to build a system that

works on Red Hat Linux, i.e. that is based on glibc version 2.5.

Furthermore, this patch fixes a number of gcc 4.3.3 build errors in glibc 2.5
that occur on both x86 and x86_64. The older version of this library is still
useful for running Nix on a Red Hat host. Newer version of glibc fail to detect
the kernel's capabilities correctly (due to mad patches applied to the kernel
by Red Hat).

The individual changes are:

 * Re-activated glibc 2.5 in all-packages.nix.

 * Fix incomplete header search path in bootstrap tools.

   Gcc-wrapper sets "-B<prefix>" to tell the compiler about its installation
   root. Unfortunately, the setting doesn't add $gcc/lib/gcc/*/*/include-fixed
   to the search path. That directory is required, however, because it contains
   the system-specific "limits.h" file, and the glibc 2.5 builds tries to find
   that file via #include_next.

 * Support intrinsic functions like __signbit() or atof() correctly to avoid
   compile-time conflicts.

 * Switch to NPTL. Linuxthreads is no longer supported.

 * Added a meta attribute to glibc package.

 * Updated nixUnstable to version 0.13pre15614 from trunk. The previous version
   failed regression tests.

 * Fix more strict type checking in binutils since 2.18.50.0.3.

   Without this patch, the build failed on x86, saying:

     ../sysdeps/i386/fpu/ftestexcept.c: Assembler messages:
     ../sysdeps/i386/fpu/ftestexcept.c:33: Error: suffix or operands invalid for `fnstsw'

svn path=/nixpkgs/branches/stdenv-updates/; revision=16037

1 files changed, 9 insertions, 2 deletions

diff --git a/pkgs/build-support/gcc-wrapper/builder.sh b/pkgs/build-support/gcc-wrapper/builder.sh
index 0691b4273254..0fe3f3768f2a 100644
--- a/pkgs/build-support/gcc-wrapper/builder.sh
+++ b/pkgs/build-support/gcc-wrapper/builder.sh
@@ -17,8 +17,15 @@ if test -z "$nativeLibc"; then
     # against the crt1.o from our own glibc, rather than the one in
     # /usr/lib.  (This is only an issue when using an `impure'
     # compiler/linker, i.e., one that searches /usr/lib and so on.)
-    echo "-B$libc/lib/ -idirafter $libc/include" > $out/nix-support/libc-cflags
-    
+    #
+    # Unfortunately, setting -B appears to override the default search
+    # path. Thus, the gcc-specific "../includes-fixed" directory is
+    # now longer searched and glibc's <limits.h> header fails to
+    # compile, because it uses "#include_next <limits.h>" to find the
+    # limits.h file in ../includes-fixed. To remedy the problem,
+    # another -idirafter is necessary to add that directory again.
+    echo "-B$libc/lib/ -idirafter $libc/include -idirafter $gcc/lib/gcc/*/*/include-fixed" > $out/nix-support/libc-cflags
+
     echo "-L$libc/lib" > $out/nix-support/libc-ldflags
 
     # The dynamic linker is passed in `ldflagsBefore' to allow