Testing new gcc wrapper script

Testing new gcc wrapper script

[Rich Felker]

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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

[-- Attachment #2: my-musl-gcc --]
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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 \

Re: Testing new gcc wrapper script

[Szabolcs Nagy]

* Rich Felker <dalias@aerifal.cx> [2011-09-21 01:14:28 -0400]:
> 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

./configure might test cc --version which fails with my-musl-gcc
another special option is -V which must come first

if HOME is not set or / then maybe use /tmp instead of $HOME/.tmp

i had to add -fno-stack-protector

Re: Testing new gcc wrapper script

[Rich Felker]

On Wed, Sep 21, 2011 at 12:59:41PM +0200, Szabolcs Nagy wrote:
> * Rich Felker <dalias@aerifal.cx> [2011-09-21 01:14:28 -0400]:
> > 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
> 
> ../configure might test cc --version which fails with my-musl-gcc

This works fine as far as I can tell.

> another special option is -V which must come first

This is broken; I can fix it though.

> if HOME is not set or / then maybe use /tmp instead of $HOME/.tmp

I suppose it's a good idea.

> i had to add -fno-stack-protector

This is a toolchain bug but worth working around anyway.

Rich

Re: Testing new gcc wrapper script

[Szabolcs Nagy]

* Rich Felker <dalias@aerifal.cx> [2011-09-21 10:02:16 -0400]:

> On Wed, Sep 21, 2011 at 12:59:41PM +0200, Szabolcs Nagy wrote:
> > * Rich Felker <dalias@aerifal.cx> [2011-09-21 01:14:28 -0400]:
> > > 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
> > 
> > ../configure might test cc --version which fails with my-musl-gcc
> 
> This works fine as far as I can tell.
> 

i get
$ ./my-musl-gcc --version
/home/nsz/.tmp/gcc_wrapper/musl-gcc (Ubuntu 4.3.3-5ubuntu4) 4.3.3 Copyright (C) 2008 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.-gcc (Ubuntu 4.3.3-5ubuntu4) 4.3.3 Copyright (C) 2008 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
mkdir: cannot create directory `/home/nsz/.tmp/gcc_wrapper/musl-gcc (Ubuntu 4.3.3-5ubuntu4) 4.3.3\nCopyright (C) 2008 Free Software Foundation, Inc.\nThis is free software; see the source for copying conditions.  There is NO\nwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.-gcc (Ubuntu 4.3.3-5ubuntu4) 4.3.3\nCopyright (C) 2008 Free Software Foundation, Inc.\nThis is free software; see the source for copying conditions.  There is NO\nwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.': File name too long

so --version goes to stdout and -print-file-name is discarded when i run
gcc --version -print-file-name=libgcc.a

Re: Testing new gcc wrapper script

[Rich Felker]

On Wed, Sep 21, 2011 at 05:05:33PM +0200, Szabolcs Nagy wrote:
> * Rich Felker <dalias@aerifal.cx> [2011-09-21 10:02:16 -0400]:
> 
> > On Wed, Sep 21, 2011 at 12:59:41PM +0200, Szabolcs Nagy wrote:
> > > * Rich Felker <dalias@aerifal.cx> [2011-09-21 01:14:28 -0400]:
> > > > 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
> > > 
> > > ../configure might test cc --version which fails with my-musl-gcc
> > 
> > This works fine as far as I can tell.
> > 
> 
> i get
> $ ./my-musl-gcc --version
> [...]
> 
> so --version goes to stdout and -print-file-name is discarded when i run
> gcc --version -print-file-name=libgcc.a

I see. Wonder why it didn't happen for me. Anyway I'll fix it. Thanks
for the reports! Hopefully this will be able to go into the next
release...

Rich