Testing new gcc wrapper script

[Rich Felker <dalias@aerifal.cx>]

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The existing gcc wrapper script shipped with musl hasn't been very
robust, and it doesn't work with pre-4.4 gcc. I'm testing a new
version (attached to this email) and I'd like some feedback on how
well it works. Edit the top of the file to choose your installation
location, compiler to run, etc. then invoke it just like before.

Rich

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#!/bin/sh

gcc=gcc
libc_name=musl
libc_prefix="/usr/local/musl"
ldso_pathname="/lib/ld-musl-i386.so.1"
libc_lib=$libc_prefix/lib
libc_inc=$libc_prefix/include
libc_crt="$libc_lib/crt1.o"
libc_start="$libc_lib/crti.o"
libc_end="$libc_lib/crtn.o"

gcc_inc=$libc_inc
libgcc="$("$gcc" "$@" -print-file-name=libgcc.a)"
libgcc=${libgcc%/libgcc.a}

gccver=${libgcc##*/}
gcctarget=${libgcc%/*}
gcctarget=${gcctarget##*/}

collect2="$("$gcc" -print-prog-name=collect2)"
wrap_dir=$HOME/.tmp/gcc_wrapper/$libc_name-$gcctarget-$gccver

if false && [ -x "$wrap_dir/collect2" ] ; then true
else
mkdir -p "$wrap_dir" || exit 1
echo '#!/bin/sh
first=1
for i ; do
[ "$first" ] && { first= ; set -- ; }
case "$i" in
-L/dev/null) nolibs=1 ;;
-L*) [ "$nolibs" ] || set -- "$@" "$i" ;;
*) set -- "$@" "$i" ;;
esac
done
exec "'"$collect2"'" "$@"' > "$wrap_dir/collect2.$$"
chmod 755 "$wrap_dir/collect2.$$"
mv "$wrap_dir/collect2.$$" "$wrap_dir/collect2"
fi

for i ; do
case "$skip$i" in
-I|-L) skip=- ; continue ;;
-[cSE]|-M*) nolink=1 ;;
-*) ;;
*) havefile=1 ;;
esac
skip=
done

if [ "$nolink" ] ; then
exec "$gcc" -std=gnu99 -nostdinc -isystem "$libc_inc" -isystem "$gcc_inc" "$@"
exit 1
fi

if [ "$havefile" ] ; then
exec "$gcc" -B"$wrap_dir" \
  -std=gnu99 -nostdinc -nostdlib \
  -isystem "$libc_inc" -isystem "$gcc_inc" \
  "$libc_start" "$libc_crt" "$@" "$libc_end" \
  -L"$libc_lib" -L"$libgcc" -L/dev/null \
  -Wl,--start-group -lc -lgcc -Wl,--end-group \
  -Wl,-dynamic-linker,"$ldso_pathname" -Wl,-nostdlib
exit 1
fi

exec "$gcc" -std=gnu99 -nostdinc -nostdlib \
  -isystem "$libc_inc" -isystem "$gcc_inc" \
  "$@" \
  -L"$libc_lib" -L"$libgcc" -L/dev/null \