[Bug jit/64089] libgccjit.so.0.0.1 linkage failure on darwin

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64089

--- Comment #10 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
FWIW, homebrew has a formula for building libgccjit on OS X:
 https://github.com/Homebrew/homebrew/blob/master/Library/Formula/gcc.rb

Currently it applies this patch:

diff --git a/gcc/jit/Make-lang.in b/gcc/jit/Make-lang.in
index 44d0750..4df2a9c 100644
--- a/gcc/jit/Make-lang.in
+++ b/gcc/jit/Make-lang.in
@@ -85,8 +85,7 @@ $(LIBGCCJIT_FILENAME): $(jit_OBJS) \
             $(jit_OBJS) libbackend.a libcommon-target.a libcommon.a \
             $(CPPLIB) $(LIBDECNUMBER) $(LIBS) $(BACKENDLIBS) \
             $(EXTRA_GCC_OBJS) \
-            -Wl,--version-script=$(srcdir)/jit/libgccjit.map \
-            -Wl,-soname,$(LIBGCCJIT_SONAME)
+            -Wl,-install_name,$(LIBGCCJIT_SONAME)

 $(LIBGCCJIT_SONAME_SYMLINK): $(LIBGCCJIT_FILENAME)
        ln -sf $(LIBGCCJIT_FILENAME) $(LIBGCCJIT_SONAME_SYMLINK)

along with this patch:
  https://gcc.gnu.org/ml/jit/2015-q3/msg00148.html
which is in:
  trunk as r226882.
  gcc-5-branch as r226883.