[Parser] Rename generated `.c` to `.cpp` files (#8894)

Using Clang on my machine, I am seeing the following warning:

```
clang-13: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]
```

This is because we are treating the generated `.c` files as C++
files. To make our build system more robust, this commit
changes our command for generating files to rename the
generated files to use the `.cpp` extension.

diff --git a/src/parser/CMakeLists.txt b/src/parser/CMakeLists.txt
index 4a672b1c1ce7cc8340ccc1d6ebbb163c188c7266..74fd7c4e5f6843e78edd7d23fd95b8f0b6ba5fc8 100644 (file)
--- a/src/parser/CMakeLists.txt
+++ b/src/parser/CMakeLists.txt
@@ -48,8 +48,6 @@ set(libcvc5parser_src_files
   smt2/smt2_input.h
   smt2/sygus_input.cpp
   smt2/sygus_input.h
-  tptp/TptpLexer.c
-  tptp/TptpParser.c
   tptp/tptp.cpp
   tptp/tptp.h
   tptp/tptp_input.cpp
@@ -62,26 +60,33 @@ set(libcvc5parser_src_files
 foreach(lang Smt2 Tptp)
   string(TOLOWER ${lang} lang_dir)
   file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir})
+
+  set(gen_src_files
+    ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Lexer.cpp
+    ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Parser.cpp)
   add_custom_command(
     OUTPUT
-      ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Lexer.c
+      ${gen_src_files}
       ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Lexer.h
-      ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Parser.c
       ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Parser.h
       ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}.tokens
     COMMAND
       ${ANTLR3_COMMAND}
         ${CMAKE_CURRENT_SOURCE_DIR}/${lang_dir}/${lang}.g
         -fo ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}
+    COMMAND
+      # We actually generate C++ files with ANTLR
+      ${CMAKE_COMMAND} -E rename
+        ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Lexer.c
+        ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Lexer.cpp
+    COMMAND
+      # We actually generate C++ files with ANTLR
+      ${CMAKE_COMMAND} -E rename
+        ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Parser.c
+        ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Parser.cpp
     DEPENDS
       ${lang_dir}/${lang}.g
   )
-  set(gen_src_files
-    ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Lexer.c
-    ${CMAKE_CURRENT_BINARY_DIR}/${lang_dir}/${lang}Parser.c)
-
-  # Tell cmake that generated source files are actually c++ files
-  set_source_files_properties(${gen_src_files} PROPERTIES LANGUAGE CXX)
   set_source_files_properties(${gen_src_files} PROPERTIES GENERATED TRUE)
 
   # We don't want to enable -Wall for code generated by ANTLR.