Re: New gcc wrapper, take 3

[Rich Felker <dalias@aerifal.cx>]

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On Wed, Sep 21, 2011 at 04:41:04PM -0400, Rich Felker wrote:
> Now updated to use -specs instead of extra wrapping layers with -B in
> order to inhibit the default library paths. This version should be
> faster, cleaner, and perhaps even more correct than the previous
> attempts. I believe some of the other options could also be integrated
> into the specs file passed in, and this might make things even cleaner
> still.
> 
> Please test and let me know if there are problems.

There were problems... stupid handling of removing the temp file.
Try the new version.

Rich

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#!/bin/sh

gcc=gcc
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##*/}

case "$gccver" in
2.*|3.*|4.[01]*) ;;
*) nosp=-fno-stack-protector ;;
esac

[ "x$1" = "x-V" ] && { printf "%s: -V not supported\n" "$0" ; exit 1 ; }

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

[ "$havefile" ] || nolink=1

[ "$nolink" ] || {
tmp_specs=$HOME/.specs.tmp.$$
printf '*link_libgcc:\n\n\n' > "$tmp_specs" || exit 1
exec 3<"$tmp_specs"
rm -f "$tmp_specs"
set -- -specs=/dev/fd/3 "$libc_start" "$libc_crt" "$@" "$libc_end" \
  -Wl,--start-group -lc -lgcc -lgcc_eh -Wl,--end-group \
  -Wl,-dynamic-linker,"$ldso_pathname" -Wl,-nostdlib
}

set -- -std=gnu99 -nostdinc -nostdlib $nosp \
  -isystem "$libc_inc" -isystem "$gcc_inc" "$@" \
  -L"$libc_lib" -L"$libgcc"

exec "$gcc" "$@"