From 0c455f30c8e9f0970009bd19013ab7712faf2e8f Mon Sep 17 00:00:00 2001
From: Parth Shitole <f20212907@goa.bits-pilani.ac.in>
Date: Wed, 23 Oct 2024 20:10:40 +0530
Subject: [PATCH] Macro converted to a function and placed in P4CUtils

- The Previous implementation of a macro is now converted to a function and placed in the P4CUtils.cmake file
- Other minor changes are made to improve the functionality.

Signed-off-by: Parth Shitole <f20212907@goa.bits-pilani.ac.in>
---
 CMakeLists.txt               | 26 --------------------------
 backends/ebpf/CMakeLists.txt | 10 ++++------
 cmake/P4CUtils.cmake         | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 37 insertions(+), 32 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b9a6341cd49..981722f0ca9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -282,32 +282,6 @@ endif()
 # enable CTest
 enable_testing ()
 
-# Macro to check dependencies before adding tests
-
-macro(CHECK_DEPENDENCIES TEST_DEPENDENCY_PROGRAMS TEST_DEPENDENCY_LIBRARIES)
-    foreach(PROG ${TEST_DEPENDENCY_PROGRAMS})
-        find_program(${PROG}_FOUND ${PROG})
-        if (${PROG}_FOUND)
-            message(STATUS "Found program ${PROG} at ${${PROG}_FOUND}")
-        else()
-            message(WARNING "Missing program ${PROG}, disabling relevant tests."
-            " Please install ${PROG} and ensure it is in your PATH.")
-            set(TEST_DEPENDENCY_PRESENT FALSE)
-        endif()
-    endforeach()
-
-    foreach(LIB ${TEST_DEPENDENCY_LIBRARIES})
-        find_library(${LIB}_FOUND ${LIB} HINTS "${CMAKE_CURRENT_SOURCE_DIR}/runtime/usr/lib64/")
-        if (${LIB}_FOUND)
-            message(STATUS "Found library ${LIB} at ${${LIB}_FOUND}")
-        else()
-            message(WARNING "Missing library ${LIB}, disabling relevant tests."
-            " Please install ${LIB}.")
-            set(TEST_DEPENDENCY_PRESENT FALSE)
-        endif()
-    endforeach()
-endmacro()
-
 # if we want to manage versions in CMake ...
 # include (cmake/P4CVersion.cmake)
 # set (CPACK_PACKAGE_VERSION_MAJOR ${__P4C_VERSION_MAJOR})
diff --git a/backends/ebpf/CMakeLists.txt b/backends/ebpf/CMakeLists.txt
index fbe0da20b64..b1154c7e624 100644
--- a/backends/ebpf/CMakeLists.txt
+++ b/backends/ebpf/CMakeLists.txt
@@ -222,14 +222,12 @@ else()
 endif()
 
 # List of executable dependencies
-set(TEST_DEPENDENCY_PROGRAMS scapy tcpdump pcap)
+set(TEST_DEPENDENCY_PROGRAMS tcpdump)
 
 # List of library dependencies
-set(TEST_DEPENDENCY_LIBRARIES libpcap-dev gcc-multilib)
+set(TEST_DEPENDENCY_LIBRARIES libpcap-dev gcc-multilib scapy)
 
-set(TEST_DEPENDENCY_PRESENT TRUE)
-
-CHECK_DEPENDENCIES("${TEST_DEPENDENCY_PROGRAMS}" "${TEST_DEPENDENCY_LIBRARIES}")
+CHECK_DEPENDENCIES(TEST_DEPENDENCY_PRESENT "${TEST_DEPENDENCY_PROGRAMS}" "${TEST_DEPENDENCY_LIBRARIES}")
 
 # check for the libbpf library
 find_library(LIBBPF NAMES bpf HINTS "${CMAKE_CURRENT_SOURCE_DIR}/runtime/usr/lib64/")
@@ -264,7 +262,7 @@ if(TEST_DEPENDENCY_PRESENT)
   # We do not have support for dynamic addition of tables in the test framework
   p4c_add_test_with_args("ebpf" ${EBPF_DRIVER_TEST} TRUE "testdata/p4_16_samples/ebpf_conntrack_extern.p4" "testdata/p4_16_samples/ebpf_conntrack_extern.p4" "--extern-file ${P4C_SOURCE_DIR}/testdata/extern_modules/extern-conntrack-ebpf.c" "")
 else()
-  message(WARNING "Skipped adding Tests due to missing dependencies. Please install the dependencies and try again")
+  message(WARNING "Skipped adding Tests due to missing dependencies" "Please install the dependencies and try again")
 endif()
 
 message(STATUS "Done with configuring BPF back end")
diff --git a/cmake/P4CUtils.cmake b/cmake/P4CUtils.cmake
index 509c90f7b16..944e1b8b7e3 100644
--- a/cmake/P4CUtils.cmake
+++ b/cmake/P4CUtils.cmake
@@ -420,3 +420,36 @@ function(get_all_targets _result _dir)
   get_directory_property(_sub_targets DIRECTORY "${_dir}" BUILDSYSTEM_TARGETS)
   set(${_result} ${${_result}} ${_sub_targets} PARENT_SCOPE)
 endfunction()
+
+# Checks for presence of programs and dependencies 
+function(CHECK_DEPENDENCIES OUT_VAR TEST_DEPENDENCY_PROGRAMS TEST_DEPENDENCY_LIBRARIES)
+    set(ALL_FOUND TRUE)
+
+    foreach(PROG ${TEST_DEPENDENCY_PROGRAMS})
+        find_program(PROG_PATH ${PROG})
+        if (NOT PROG_PATH)
+            message(WARNING "Missing program ${PROG}."
+                    " Please install ${PROG} and ensure it is in your PATH.")
+            set(ALL_FOUND FALSE)
+        else()
+            message(STATUS "Found program ${PROG} at ${PROG_PATH}")
+        endif()
+    endforeach()
+
+    foreach(LIB ${TEST_DEPENDENCY_LIBRARIES})
+        find_library(LIB_PATH ${LIB} HINTS "${CMAKE_CURRENT_SOURCE_DIR}/runtime/usr/lib64/")
+        if (NOT LIB_PATH)
+            message(WARNING "Missing library ${LIB}."
+                    " Please install ${LIB}.")
+            set(ALL_FOUND FALSE)
+        else()
+            message(STATUS "Found library ${LIB} at ${LIB_PATH}")
+        endif()
+    endforeach()
+
+    if (ALL_FOUND)
+        set(${OUT_VAR} TRUE PARENT_SCOPE)
+    else()
+        set(${OUT_VAR} FALSE PARENT_SCOPE)
+    endif()
+endfunction()
\ No newline at end of file