CVC4: Add patches to ease building on AArch64

This adds the patches from #50, which will make it easier to build CVC4 on
AArch64 (and especially AArch64 Linux) in the future:

* `cvc4-antlr-check-aarch64.patch` This updates the very old
  `config.guess` and `config.sub` scripts that ANTLR uses (dating back to 2009)
  to more recent ones that are aware of AArch64 Linux and Darwin. Doing so
  fixes a spurious warning about building for 32-bit on AArch64 Darwin (thereby
  fixing #53) and unbreaks the AArch64 Linux build.

  Also, ANTLR's `configure` script will pass x86-specific flags such as `-m64`
  by default, which aren't supported by `gcc` on other architectures (e.g.,
  AArch64). We can prevent this by passing `--disable-abiflags` to `configure`
  on these architectures.

* `cvc4-antlr-pointer-to-integer-cast.patch`: Fix an implicit
  pointer-to-integer cast that causes x86-64 `gcc` to warn, but causes AArch64
  `gcc` to fail with a full-blown error.

.github/ci.sh

@@ -83,7 +83,10 @@ build_boolector() {
 
 build_cvc4() {
   pushd repos/CVC4-archived
+  # Make the get-antlr script work on both x86-64 and AArch64
   patch -p1 -i $PATCHES/cvc4-antlr-check-aarch64.patch
+  # Fix a pointer-to-integer cast in ANTLR
+  patch -p1 -i $PATCHES/cvc4-antlr-pointer-to-integer-cast.patch
   # Add missing #include statements that macos-14's version of Clang++ requires.
   patch -p1 -i $PATCHES/cvc4-fix-missing-includes.patch
   ./contrib/get-antlr-3.4

patches/cvc4-antlr-check-aarch64.patch

@@ -1,17 +1,55 @@
 diff --git a/contrib/get-antlr-3.4 b/contrib/get-antlr-3.4
-index 45dc86583..ea69b4b7f 100755
+index 45dc86583..685623f19 100755
 --- a/contrib/get-antlr-3.4
 +++ b/contrib/get-antlr-3.4
-@@ -47,7 +47,7 @@ cd "$ANTLR_HOME_DIR/libantlr3c-3.4"
+@@ -26,6 +26,22 @@ if [ -z "${MACHINE_TYPE}" ]; then
+   MACHINE_TYPE=$(${CONFIG_GUESS_SCRIPT} | sed 's,-.*,,')
+ fi
 
++# In addition to config.guess, we also download a more recent version of
++# config.sub. We aren't going to use it directly in this script, but we will
++# copy it into our ANTLR checkout later.
++CONFIG_SUB_SCRIPT="$ANTLR_HOME_DIR/config.sub"
++if ! [ -e "${CONFIG_SUB_SCRIPT}" ]; then
++  mkdir -p "$ANTLR_HOME_DIR"
++  # Attempt to download once
++  webget 'http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD' $CONFIG_SUB_SCRIPT
++  if [ -e "$CONFIG_SUB_SCRIPT" ]; then
++    chmod +x "$CONFIG_SUB_SCRIPT"
++  else
++    echo "$(basename $0): I need an up-to-date version of config/config.sub." >&2
++    exit 1
++  fi
++fi
++
+ mkdir -p "$INSTALL_DIR/share/java"
+ webget \
+   "https://www.antlr3.org/download/antlr-3.4-complete.jar" \
+@@ -43,11 +59,22 @@ install_bin "$ANTLR_HOME_DIR/bin/antlr3"
+ setup_dep \
+   "https://www.antlr3.org/download/C/libantlr3c-3.4.tar.gz" \
+   "$ANTLR_HOME_DIR/libantlr3c-3.4"
++# Use more up-to-date config.guess and config.sub scripts that are aware of
++# AArch64 Linux and Darwin.
++cp "${CONFIG_GUESS_SCRIPT}" "$ANTLR_HOME_DIR/libantlr3c-3.4/config.guess"
++cp "${CONFIG_SUB_SCRIPT}"   "$ANTLR_HOME_DIR/libantlr3c-3.4/config.sub"
+ cd "$ANTLR_HOME_DIR/libantlr3c-3.4"
+
++# By default, ANTLR's configure script will attempt to pass x86-specific flags
++# such as -m64, which do not exist on other architectures (e.g., ARM). We can
++# override this default by passing --disable-abiflags to the configure script.
++if [[ "${MACHINE_TYPE}" != 'x86_64' ]]; then
++  ANTLR_CONFIGURE_ARGS="--disable-abiflags ${ANTLR_CONFIGURE_ARGS}"
++fi
++
  # Make antlr3debughandlers.c empty to avoid unreferenced symbols
  rm -rf src/antlr3debughandlers.c && touch src/antlr3debughandlers.c
 -if [ "${MACHINE_TYPE}" == 'x86_64' ]; then
 +if [[ "${MACHINE_TYPE}" == 'x86_64' || "${MACHINE_TYPE}" == 'aarch64' ]]; then
    # 64-bit stuff here
    ./configure --enable-64bit --disable-antlrdebug --prefix="$INSTALL_DIR" $ANTLR_CONFIGURE_ARGS $BUILD_TYPE
  else
-@@ -67,7 +67,7 @@ fi
+@@ -67,7 +94,7 @@ fi
  mv "$INSTALL_LIB_DIR/libantlr3c.a" "$INSTALL_LIB_DIR/libantlr3c-static.a"
  make clean
 
@@ -20,7 +58,7 @@ index 45dc86583..ea69b4b7f 100755
    # 64-bit stuff here
    ./configure --enable-64bit --with-pic --disable-antlrdebug --prefix="$INSTALL_DIR" $ANTLR_CONFIGURE_ARGS $BUILD_TYPE
  else
-@@ -84,7 +84,7 @@ mv "$INSTALL_LIB_DIR/libantlr3c.la" "$INSTALL_LIB_DIR/libantlr3c.la.orig"
+@@ -84,7 +111,7 @@ mv "$INSTALL_LIB_DIR/libantlr3c.la" "$INSTALL_LIB_DIR/libantlr3c.la.orig"
  awk '/^old_library=/ {print "old_library='\''libantlr3c-static.a'\''"} /^library_names=/ {print "library_names='\''libantlr3c.a'\''"} !/^old_library=/ && !/^library_names=/ {print}' < "$INSTALL_LIB_DIR/libantlr3c.la.orig" > "$INSTALL_LIB_DIR/libantlr3c.la"
  rm "$INSTALL_LIB_DIR/libantlr3c.la.orig"
 

patches/cvc4-antlr-pointer-to-integer-cast.patch

@@ -0,0 +1,22 @@
+diff --git a/src/parser/antlr_line_buffered_input.cpp b/src/parser/antlr_line_buffered_input.cpp
+index cdf553880..ba0214dd4 100644
+--- a/src/parser/antlr_line_buffered_input.cpp
++++ b/src/parser/antlr_line_buffered_input.cpp
+@@ -31,6 +31,7 @@
+ #include "parser/antlr_line_buffered_input.h"
+
+ #include <antlr3.h>
++#include <stdint.h>
+ #include <iostream>
+ #include <string>
+ #include <cassert>
+@@ -288,7 +289,7 @@ static void bufferedInputSeek(pANTLR3_INT_STREAM is, ANTLR3_MARKER seekPoint) {
+               ->line_buffer->isPtrBefore(
+                   (uint8_t*)seekPoint, input->line, input->charPositionInLine));
+
+-  while ((ANTLR3_MARKER)(input->nextChar) != seekPoint) {
++  while ((ANTLR3_MARKER)((intptr_t)input->nextChar) != seekPoint) {
+     is->consume(is);
+   }
+ }
+