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Cross-compile for wasm32-wasi target

This commit adds experimental cross-compilation support for
`wasm32-wasi` target. With this commit added, it is now possible
to cross-compile `flite` to [WASI] which then can be run using
any WASI-compatible runtime such as [Wasmtime].

[WASI]: https://wasi.dev
[Wasmtime]: https://wasmtime.dev

--- a/README.md

+++ b/README.md

@@ -124,6 +124,8 @@

     o OSF1 V4.0 (gives an unimportant warning about sizes when compiled cst_val.c)

+    o WASI has experimental support (see below for details)

+

 Previously we supported PalmOS and Windows CE but these seem to be rare

 nowadays so they are no longer actively supported.

@@ -133,6 +135,47 @@

 byte order constraints in some structures.  These are portable but may

 require reordering of some fields, contact us if you are moving to

 a new archiecture.

+

+### Cross-compiling to WASI (experimental)

+In order to successfully cross-compile to WASI, firstly head over to

+[CraneStation/wasi-sdk](https://github.com/CraneStation/wasi-sdk)

+and install the WASI toolchain.

+

+Afterwards, you can cross-compile to WASI as follows:

+

+```

+./configure --host=wasm32-wasi \

+CC=/path/to/wasi-sdk/bin/clang \

+AR=/path/to/wasi-sdk/bin/llvm-ar \

+RANLIB=/path/to/wasi-sdk/bin/llvm-ranlib

+```

+

+It is important to correctly specify `ar` and `ranlib` that is bundled

+with the WASI `clang`. Otherwise, you will most likely experience missing

+symbols during linking, plus you may experience weird `llvm` errors such as

+

+```

+LLVM ERROR: malformed uleb128, extends past end

+```

+

+When cross-compiling from macOS, you might have to manually specify the sysroot.

+You can do this by tweaking the `CC` variable as follows:

+

+```

+CC="/path/to/wasi-sdk/bin/clang --sysroot=/path/to/wasi-sdk/share/sysroot"

+```

+

+After the configure step is successful, simply run as usual:

+```

+make

+```

+

+The generated WASI binary can then be found in `bin/` directory:

+

+```

+file bin/flite

+> bin/flite: WebAssembly (wasm) binary module version 0x1 (MVP)

+```

 News

 ----

--- a/config.sub

+++ b/config.sub

@@ -127,6 +127,10 @@

     os=-linux-android

     basic_machine=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`-unknown

     ;;

+  wasm32-wasi)

+    echo "wasm32-wasi"

+    exit

+    ;;

   *)

     basic_machine=`echo $1 | sed 's/-[^-]*$//'`

     if [ $basic_machine != $1 ]

--- a/configure

+++ b/configure

@@ -2245,21 +2245,28 @@

 $as_echo "$ac_cv_host" >&6; }

 case $ac_cv_host in

 *-*-*) ;;

+wasm32-wasi) ;;

 *) as_fn_error $? "invalid value of canonical host" "$LINENO" 5;;

 esac

 host=$ac_cv_host

-ac_save_IFS=$IFS; IFS='-'

-set x $ac_cv_host

-shift

-host_cpu=$1

-host_vendor=$2

-shift; shift

-# Remember, the first character of IFS is used to create $*,

-# except with old shells:

-host_os=$*

-IFS=$ac_save_IFS

-case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac

+if [ $host = "wasm32-wasi" ]; then

+  host_cpu="wasm32"

+  host_vendor=

+  host_os="wasi"

+else

+  ac_save_IFS=$IFS; IFS='-'

+  set x $ac_cv_host

+  shift

+  host_cpu=$1

+  host_vendor=$2

+  shift; shift

+  # Remember, the first character of IFS is used to create $*,

+  # except with old shells:

+  host_os=$*

+  IFS=$ac_save_IFS

+  case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac

+fi

 { $as_echo "$as_me:${as_lineno-$LINENO}: checking target system type" >&5

 $as_echo_n "checking target system type... " >&6; }

@@ -2278,21 +2285,28 @@

 $as_echo "$ac_cv_target" >&6; }

 case $ac_cv_target in

 *-*-*) ;;

+wasm32-wasi) ;;

 *) as_fn_error $? "invalid value of canonical target" "$LINENO" 5;;

 esac

 target=$ac_cv_target

-ac_save_IFS=$IFS; IFS='-'

-set x $ac_cv_target

-shift

-target_cpu=$1

-target_vendor=$2

-shift; shift

-# Remember, the first character of IFS is used to create $*,

-# except with old shells:

-target_os=$*

-IFS=$ac_save_IFS

-case $target_os in *\ *) target_os=`echo "$target_os" | sed 's/ /-/g'`;; esac

+if [ $target = "wasm32-wasi" ]; then

+  target_cpu="wasm32"

+  target_vendor=

+  target_os="wasi"

+else

+  ac_save_IFS=$IFS; IFS='-'

+  set x $ac_cv_target

+  shift

+  target_cpu=$1

+  target_vendor=$2

+  shift; shift

+  # Remember, the first character of IFS is used to create $*,

+  # except with old shells:

+  target_os=$*

+  IFS=$ac_save_IFS

+  case $target_os in *\ *) target_os=`echo "$target_os" | sed 's/ /-/g'`;; esac

+fi

 # The aliases save the names the user supplied, while $host etc.

 # will get canonicalized.

@@ -4154,6 +4168,9 @@

 	darwin*)

 		CFLAGS="$CFLAGS -no-cpp-precomp"

 	;;

+  wasi)

+    CFLAGS="$CFLAGS -DDIE_ON_ERROR -DCST_NO_SOCKETS -DWASM32_WASI"

+  ;;

 esac

--- a/configure.in

+++ b/configure.in

@@ -210,6 +210,9 @@

 	darwin*)

 		CFLAGS="$CFLAGS -no-cpp-precomp"

 	;;

+        wasi*)

+		CFLAGS="$CFLAGS -DDIE_ON_ERROR -DCST_NO_SOCKETS -DWASM32_WASI"

+        ;;

 esac

 AC_SUBST(TARGET_OS)

--- a/main/flite_main.c

+++ b/main/flite_main.c

@@ -47,7 +47,12 @@

 #include "flite_version.h"

 cst_val *flite_set_voice_list(const char *voxdir);

+

+#ifdef WASM32_WASI

+void flite_set_lang_list(void);

+#else

 void *flite_set_lang_list(void);

+#endif

 void cst_alloc_debug_summary();

--- a/main/flitevox_info_main.c

+++ b/main/flitevox_info_main.c

@@ -46,7 +46,11 @@

 #include "cst_args.h"

 #include "flite.h"

+#ifdef WASM32_WASI

+void flite_set_lang_list(void);

+#else

 void *flite_set_lang_list(void);

+#endif

 int main(int argc, char **argv)

 {

--- a/src/utils/cst_error.c

+++ b/src/utils/cst_error.c

@@ -91,7 +91,9 @@

 }

 #else

+#ifndef WASM32_WASI

 jmp_buf *cst_errjmp = 0;

+#endif

 int cst_errmsg(const char *fmt, ...)

 {