Introduce Espressif common cmake

IDE/Espressif/ESP-IDF/cmake/README.md

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+# wolfSSL Espressif CMake Library
+
+This directory contains common functions used in various examples and components.
+
+Instead of duplicating functions in various locations, this common library can be used.
+
+Although it can be used as-is, the intent is to include it in the published wolfSSL Managed Component and include it from there when possible.
+
+## CHECK_DUPLICATE_LIBRARIES
+
+Searches for duplicate directories containing duplicate component libraries.
+
+Parameters:
+
+- RESULT_VAR (output variable)
+- KEYWORD (e.g. "wolfssl", "wolfmqtt", etc)

IDE/Espressif/ESP-IDF/cmake/common_functions.cmake

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+# IDE/Espressif/ESP-IDF/cmake/common_functions.cmake
+#
+# Copyright (C) 2006-2025 wolfSSL Inc.
+#
+# This file is part of wolfSSL.
+#
+# wolfSSL is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# wolfSSL is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
+#
+
+
+# CHECK_DUPLICATE_LIBRARIES function
+#   Parameters:
+#      RESULT_VAR (output variable)
+#      KEYWORD (e.g. "wolfssl", "wolfmqtt", etc).
+#
+# Constructs a list of possible directories based on the keyword.
+# Counts the number of existing directories.
+# If at least two directories exist, sets RESULT_VAR to TRUE, otherwise FALSE.
+# Uses PARENT_SCOPE to return the result to the calling context.
+function(CHECK_DUPLICATE_LIBRARIES RESULT_VAR KEYWORD)
+    set(DIR_LIST
+        "${CMAKE_CURRENT_LIST_DIR}/components/${KEYWORD}"
+        "${CMAKE_CURRENT_LIST_DIR}/components/my${KEYWORD}"
+        "${CMAKE_CURRENT_LIST_DIR}/managed_components/wolfssl__${KEYWORD}"
+        "${CMAKE_CURRENT_LIST_DIR}/managed_components/gojimmypi__my${KEYWORD}"
+        "${CMAKE_CURRENT_LIST_DIR}/managed_components/${THIS_USER}__my${KEYWORD}"
+        "$ENV{IDF_PATH}/components/${KEYWORD}/"
+        "$ENV{IDF_PATH}/components/esp-${KEYWORD}/"
+    )
+
+    set(EXISTING_COUNT 0)
+    set(MATCHING_DIRS "")  # List to store found directories
+
+    foreach(DIR ${DIR_LIST})
+        file(TO_CMAKE_PATH "${DIR}" DIR)  # Normalize paths
+        message(STATUS "Checking for ${KEYWORD} in ${DIR}")
+        if(EXISTS "${DIR}")
+            math(EXPR EXISTING_COUNT "${EXISTING_COUNT} + 1")
+            list(APPEND MATCHING_DIRS "${DIR}")
+            message(STATUS "Found: ${DIR}")
+        endif()
+    endforeach()
+
+    if(EXISTING_COUNT GREATER_EQUAL 2)
+        set(${RESULT_VAR} TRUE PARENT_SCOPE)
+        message(STATUS  "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
+        message(STATUS  "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
+        message(STATUS  "WARNING: Found duplicate '${KEYWORD}' in")
+        foreach(DUP_DIR ${MATCHING_DIRS})
+            message(STATUS "  - ${DUP_DIR}")
+        endforeach()
+        message(STATUS  "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
+        message(STATUS  "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
+        message(WARNING "WARNING: More than 1 '${KEYWORD}' component directories exist.")
+
+        # Append the warning flag to CMAKE_C_FLAGS and propagate it to the parent scope
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D${KEYWORD}_MULTI_INSTALL_WARNING")
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" PARENT_SCOPE)
+    else()
+        set(${RESULT_VAR} FALSE PARENT_SCOPE)
+
+        message(STATUS "Confirmed less than two '${KEYWORD}' component directories exist.")
+    endif()
+endfunction()