[Opus] Build for experimental platforms (#3097)

O/Opus/build_tarballs.jl

@@ -11,13 +11,21 @@ sources = [
                   "65b58e1e25b2a114157014736a3d9dfeaad8d41be1c8179866f144a2fb44ff9d"),
 ]
 
+version = v"1.3.2" # <--- This version number is a lie to build for experimental platforms
+
 # Bash recipe for building across all platforms
 script = raw"""
 cd $WORKSPACE/srcdir/opus-*/
 
-# On musl, disable stack protection (https://www.openwall.com/lists/musl/2018/09/11/2)
 if [[ ${target} == *musl* ]]; then
+    # On musl, disable stack protection (https://www.openwall.com/lists/musl/2018/09/11/2)
     STACK_PROTECTOR="--disable-stack-protector"
+elif [[ "${target}" == *-mingw* ]]; then
+    # Fix error
+    #     /opt/x86_64-w64-mingw32/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld: src/opus_compare.o: in function `fread':
+    #     /opt/x86_64-w64-mingw32/x86_64-w64-mingw32/sys-root/include/stdio.h:812: undefined reference to `__chk_fail'
+    # See https://github.com/msys2/MINGW-packages/issues/5868#issuecomment-544107564
+    export LDFLAGS="-lssp"
 fi
 
 ./configure --prefix=$prefix --host=$target --build=${MACHTYPE} \
@@ -30,16 +38,16 @@ make install
 
 # These are the platforms we will build for by default, unless further
 # platforms are passed in on the command line
-platforms = supported_platforms()
+platforms = supported_platforms(; experimental=true)
 
 # The products that we will ensure are always built
 products = [
     LibraryProduct("libopus", :libopus),
 ]
 
 # Dependencies that must be installed before this package can be built
-dependencies = [
+dependencies = Dependency[
 ]
 
 # Build the tarballs, and possibly a `build.jl` as well.
-build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; preferred_gcc_version=v"8")
+build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; preferred_gcc_version=v"8", julia_compat="1.6")