nix-tinycbor-cmake.patch

--- a/c2rust-ast-exporter/src/CMakeLists.txt	2025-08-22 16:55:32.191186099 -0400
+++ b/c2rust-ast-exporter/src/CMakeLists.txt	2025-08-22 16:56:04.157045169 -0400
@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 3.5...4.0)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 project(ASTExporter)
+set(CMAKE_VERBOSE_MAKEFILE ON)
 
 #################################################
 # TinyCBOR                                      #
@@ -21,28 +22,12 @@
     set(MAKE "make")
 endif()
 
-include(ExternalProject)
-ExternalProject_Add(tinycbor_build
-            PREFIX ${TINYCBOR_PREFIX}
-            INSTALL_DIR ${CMAKE_BINARY_DIR}
-            GIT_REPOSITORY ${TINYCBOR_REPO}
-            GIT_TAG ${TINYCBOR_TAG}
-            # the fd redirection here fails when the build run inside Cargo.
-            # patch from upstream:
-            # https://github.com/intel/tinycbor/commit/6176e0a28d7c5ef3a5e9cbd02521999c412de72c
-            PATCH_COMMAND patch --forward -p1 < ${CMAKE_CURRENT_SOURCE_DIR}/tinycbor_fix_build.patch || true
-            CONFIGURE_COMMAND ${MAKE} .config && cat ${CMAKE_CURRENT_SOURCE_DIR}/tinycbor.config >> .config
-            BUILD_COMMAND ${MAKE} --quiet prefix=<INSTALL_DIR> CFLAGS=-fPIC
-            INSTALL_COMMAND ${MAKE} --quiet prefix=<INSTALL_DIR> install
-            BUILD_IN_SOURCE 1
-            BUILD_BYPRODUCTS ${CMAKE_BINARY_DIR}/lib/libtinycbor.a
-)
-
 include_directories(${CMAKE_BINARY_DIR}/include)
 
-add_library(tinycbor STATIC IMPORTED)
-set_target_properties(tinycbor PROPERTIES IMPORTED_LOCATION ${CMAKE_BINARY_DIR}/lib/libtinycbor.a)
-add_dependencies(tinycbor tinycbor_build)
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(TINYCBOR REQUIRED tinycbor)
+include_directories(${TINYCBOR_INCLUDE_DIRS})
+link_directories(${TINYCBOR_LIBRARY_DIRS})
 
 set(AST_EXPORTER_SRCS
   AstExporter.cpp
@@ -93,6 +78,9 @@
   CXX_STANDARD 17
   CXX_EXTENSIONS OFF
   )
+
+target_link_directories(c2rust-ast-exporter PRIVATE ${TINYCBOR_LIBRARY_DIRS})
+
 # PRIVATE was added to make c2rust-ast-exporter build with LLVM 6.0. Keyword
 # description: https://cmake.org/pipermail/cmake/2016-May/063400.html
 target_link_libraries(c2rust-ast-exporter PRIVATE
@@ -101,18 +89,20 @@
   clangTooling
   clangBasic
   clangASTMatchers
-  tinycbor
+  ${TINYCBOR_LIBRARIES}
   )
 
 set_target_properties(clangAstExporter PROPERTIES
   CXX_STANDARD 17 # will decay to 14 if compiler doesn't support c++17
   CXX_EXTENSIONS OFF
   )
+
+target_link_directories(clangAstExporter PRIVATE ${TINYCBOR_LIBRARY_DIRS})
 target_link_libraries(clangAstExporter PRIVATE
   clangAST
   clangFrontend
   clangTooling
   clangBasic
   clangASTMatchers
-  tinycbor
+  ${TINYCBOR_LIBRARIES}
   )