From b2c4184f1148ba1c51011ee6dd8341b9f204f54e Mon Sep 17 00:00:00 2001
From: Andres Noetzli <andres.noetzli@gmail.com>
Date: Fri, 9 Jul 2021 11:24:05 -0700
Subject: [PATCH] Use newer config.sub to fix build on Apple M1 (#6854)

When building cvc5 on macOS for M1 natively, ANTLR's version of
`config.sub` does not recognize `aarch64-apple-darwin20.5.0`. This
commit fixes that issue by downloading the latest version of
`config.sub` (similar to what we are already doing for `config.guess`).
The commit also updates the URLs for `config.guess` and `config.sub` to
the URLs recommended in the files themselves. The commit also does some
minor cleanup/simplifications of the commands for building ANTLR.
---
 cmake/FindANTLR3.cmake | 37 ++++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)

diff --git a/cmake/FindANTLR3.cmake b/cmake/FindANTLR3.cmake
index 3ed3c5376..4e669e4ac 100644
--- a/cmake/FindANTLR3.cmake
+++ b/cmake/FindANTLR3.cmake
@@ -62,15 +62,32 @@ if(NOT ANTLR3_FOUND_SYSTEM)
     ExternalProject_Add(
         ANTLR3-EP-config.guess
         ${COMMON_EP_CONFIG}
-        URL "http://git.savannah.gnu.org/gitweb/?p=config.git\\\;a=blob_plain\\\;f=config.guess\\\;hb=HEAD"
+        URL "https://git.savannah.gnu.org/cgit/config.git/plain/config.guess"
         DOWNLOAD_NAME config.guess
         DOWNLOAD_NO_EXTRACT ON
         CONFIGURE_COMMAND ""
         BUILD_COMMAND ""
-        INSTALL_COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/../config.guess <INSTALL_DIR>/share/config.guess
+        INSTALL_COMMAND ${CMAKE_COMMAND} -E copy
+          <DOWNLOAD_DIR>/config.guess
+          <INSTALL_DIR>/share/config.guess
         BUILD_BYPRODUCTS <INSTALL_DIR>/share/config.guess
     )
 
+    # Download config sub
+    ExternalProject_Add(
+        ANTLR3-EP-config.sub
+        ${COMMON_EP_CONFIG}
+        URL "https://git.savannah.gnu.org/cgit/config.git/plain/config.sub"
+        DOWNLOAD_NAME config.sub
+        DOWNLOAD_NO_EXTRACT ON
+        CONFIGURE_COMMAND ""
+        BUILD_COMMAND ""
+        INSTALL_COMMAND ${CMAKE_COMMAND} -E copy
+          <DOWNLOAD_DIR>/config.sub
+          <INSTALL_DIR>/share/config.sub
+        BUILD_BYPRODUCTS <INSTALL_DIR>/share/config.sub
+    )
+
     if(CMAKE_SYSTEM_PROCESSOR MATCHES ".*64$")
         set(64bit "--enable-64bit")
     else()
@@ -81,15 +98,17 @@ if(NOT ANTLR3_FOUND_SYSTEM)
     ExternalProject_Add(
         ANTLR3-EP-runtime
         ${COMMON_EP_CONFIG}
-        DEPENDS ANTLR3-EP-config.guess
+        BUILD_IN_SOURCE ON
+        DEPENDS ANTLR3-EP-config.guess ANTLR3-EP-config.sub
         URL https://www.antlr3.org/download/C/libantlr3c-3.4.tar.gz
         URL_HASH SHA1=faa9ab43ab4d3774f015471c3f011cc247df6a18
-        CONFIGURE_COMMAND ${CMAKE_COMMAND} -E copy 
-            <SOURCE_DIR>/../config.guess <SOURCE_DIR>/config.guess
-        COMMAND sed -i.orig "s/avr | avr32/avr | aarch64 | avr32/"
-            <SOURCE_DIR>/config.sub
-        COMMAND ${CMAKE_COMMAND} -E copy_directory <SOURCE_DIR>/include include/
-        COMMAND <SOURCE_DIR>/configure
+        PATCH_COMMAND ${CMAKE_COMMAND} -E copy
+          <INSTALL_DIR>/share/config.guess
+          <SOURCE_DIR>/config.guess
+        COMMAND ${CMAKE_COMMAND} -E copy
+          <INSTALL_DIR>/share/config.sub
+          <SOURCE_DIR>/config.sub
+        CONFIGURE_COMMAND <SOURCE_DIR>/configure
             --with-pic
             --disable-antlrdebug
             --prefix=<INSTALL_DIR>
-- 
2.30.2