Re: shmctl not found when compiling compiler-rt

["Matúš Olekšák" <oleksak.matus@gmail.com>]

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Try this patch to correctly link compiler-rt.

2018-02-13 15:15 GMT+01:00 Szabolcs Nagy <nsz@port70.net>:

> * Dmitry Golovin <dima@golovin.in> [2018-02-13 15:34:34 +0200]:
> > I'm trying to compile compiler-rt with musl and it used to be fine, but
> I can't succeed with recent versions of compiler-rt.
> >
> > The compilation fails because of the lack of real_shmctl while musl
> clearly has shmctl: http://git.musl-libc.org/cgit/
> musl/tree/src/ipc/shmctl.c
> >
> > Here is the complete output:
> >
> >     llvm/projects/compiler-rt/lib/msan/msan_interceptors.cc:1446:15:
> error: no member named 'real_shmctl' in namespace '__interception'; did you
> mean 'real_ioctl'?
> >         int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds);
> >                   ^~~~~~~~~~~~
>
> there should be a
>
> DECLARE_REAL(int, shmctl, int shmid, int cmd, void *buf)
>
> in that file which defines __interception::real_shmctl.
>
> > To compile without glibc on linux using this patch:
> > https://github.com/tpimh/ngtc/blob/alpine/patch/compiler-rt-
> 01-sanitizer-nongnu.patch
> >
> > Regards,
> > Dmitry
>

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--- a/configure
+++ b/configure
@@ -597,7 +597,8 @@
 
 # Find compiler runtime library
 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
-test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
+test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
+                 && tryldflag LIBCC "$try_libcc"
 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
                  && tryldflag LIBCC "$try_libcc"
 printf "using compiler runtime libraries: %s\n" "$LIBCC"