you should replace all the if [ "${CT_*}" = "n" ] by if [ ! "${CT_*}" = "y" ]

[class101]

Better replace because for example when you do

if [ "${CT_MULTILIB}" = "n" ]; then

and in the config file

CT_MULTILIB is not set

CT_MULTILIB is indeed to n but the condition will not be executed

It's an example of what I mean conflict when using your build.sh patch because by supporting multilib, you break the no multilib or ln -s support

[class101]

Addition: Btw I know you don't want to support ln -s but anyway to support it you should do instead

--- scripts/crosstool-NG.sh.in.orig 2014-02-03 22:10:11.752895600 +0100
+++ scripts/crosstool-NG.sh.in  2014-02-03 22:11:47.280186700 +0100
@@ -352,8 +352,10 @@
             "${CT_SYSROOT_DIR}/usr"         \
             "${CT_PREFIX_DIR}/${CT_TARGET}" \
         ; do
+        if [ ! -h "${d}/lib32" ]; then
             CT_DoExecLog ALL ln -sf "lib" "${d}/lib32"
             CT_DoExecLog ALL ln -sf "lib" "${d}/lib64"
+        fi
         done
     fi

[mingwandroid]

Good point with ! CT_MULTILIB = y, but I don't understand why you added a check before ln -sf?

If it already exists then you must have started a build in an existing build folder, which would be a bad thing to do.

[class101]

this one not really required but this was when I was testing the non sysroot option, ${CT_PREFIX_DIR}/${CT_TARGET} = CT_SYSROOT_DIR and it was causing en error attempting to create the same link twice so I added this as a safe check

But instead I prefer to use a sysroot = prefix so I put everything in top levels so I changed the path a bit more now, I just have one level of subfolders and on windows target, mingw is a link to the tuple dir , on linux /usr also links to the tuple dir and everything in the tuple dir link back to root include lib folder

    if [ "${CT_USE_SYSROOT}" = "y" ]; then
        #CT_SYSROOT_REL_DIR="${CT_SYSROOT_DIR_PREFIX:+${CT_SYSROOT_DIR_PREFIX}/}${CT_SYSROOT_NAME}"
        CT_SYSROOT_DIR="${CT_PREFIX_DIR}"
        CT_DEBUGROOT_DIR="${CT_SYSROOT_DIR}"
        CT_HEADERS_DIR="${CT_SYSROOT_DIR}/include"
        CT_SanitiseVarDir CT_SYSROOT_DIR CT_HEADERS_DIR 
        BINUTILS_SYSROOT_ARG="--with-sysroot=${CT_SYSROOT_DIR}"
        CC_CORE_SYSROOT_ARG="--with-sysroot=${CT_SYSROOT_DIR}"
        CC_SYSROOT_ARG="--with-sysroot=${CT_SYSROOT_DIR}"
        LIBC_SYSROOT_ARG=""
        # glibc's prefix must be exactly /usr, else --with-sysroot'd gcc will get
        # confused when $sysroot/usr/include is not present.
        # Note: --prefix=/usr is magic!
        # See http://www.gnu.org/software/libc/FAQ.html#s-2.2
    else

This would be awesome you support custom sysroot directories

[class101]

btw I haven't scanned much = "n" but I haven't looked at case for example, maybe there are so case you look for a "n"

[mingwandroid]

We don't want to extend the scope of this project too much (which is cross compilation on the 3 biggest desktop OSes targeting those same OSes + iPhone). We already have a very hard time worrying about merging back to upstream!

I suggest if you have changes that are not specifically related to the scope of this project then you should submit them to the crossgcc mailing list.