Add static libraries to Linux amalgamation (maplibre#3699)

Author: louwers

platform/linux/cmake/find_static_library.cmake

@@ -0,0 +1,33 @@
+function(find_static_library result_var)
+    # Usage: find_static_library(VAR_NAME NAMES name1 [name2 ...])
+    set(options)
+    set(one_value_args)
+    set(multi_value_args NAMES)
+    cmake_parse_arguments(FSL "${options}" "${one_value_args}" "${multi_value_args}" ${ARGN})
+
+    if(NOT FSL_NAMES)
+        message(FATAL_ERROR "find_static_library: NAMES argument required")
+    endif()
+
+    # Clear any previous cached result for this variable
+    unset(${result_var} CACHE)
+
+    # Temporarily force CMake to look only for .a
+    set(_old_suffixes ${CMAKE_FIND_LIBRARY_SUFFIXES})
+    set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
+
+    # Invoke find_library using the caller's var name
+    find_library(${result_var} NAMES ${FSL_NAMES})
+
+    # Restore original suffix list
+    set(CMAKE_FIND_LIBRARY_SUFFIXES ${_old_suffixes})
+
+    # Check result
+    if(NOT ${result_var})
+        message(FATAL_ERROR
+            "find_static_library: could not find any of [${FSL_NAMES}] as a .a")
+    endif()
+
+    message(STATUS
+        "find_static_library: Found static [${FSL_NAMES}] -> ${${result_var}}")
+endfunction()

platform/linux/linux.cmake

@@ -184,6 +184,16 @@ target_link_libraries(
 # Bundle system provided libraries
 if(MLN_CORE_INCLUDE_DEPS AND NOT MLN_USE_BUILTIN_ICU AND NOT "${ARMERGE}" STREQUAL "ARMERGE-NOTFOUND")
     message(STATUS "Found armerge: ${ARMERGE}")
+    include(${CMAKE_CURRENT_LIST_DIR}/cmake/find_static_library.cmake)
+    find_static_library(PNG_STATIC_LIB NAMES png)
+    find_static_library(ZLIB_STATIC_LIB NAMES z)
+    find_static_library(JPEG_STATIC_LIB NAMES jpeg)
+    find_static_library(WEBP_STATIC_LIB NAMES webp)
+    find_static_library(CURL_STATIC_LIB NAMES curl)
+    find_static_library(UV_STATIC_LIB NAMES uv)
+    find_static_library(OPENSSL_STATIC_LIB NAMES ssl)
+    find_static_library(SQLITE_STATIC_LIB NAMES sqlite3)
+
     add_custom_command(
         TARGET mbgl-core
         POST_BUILD
@@ -192,6 +202,14 @@ if(MLN_CORE_INCLUDE_DEPS AND NOT MLN_USE_BUILTIN_ICU AND NOT "${ARMERGE}" STREQU
             ${ICUUC_LIBRARY_DIRS}/libicuuc.a
             ${ICUUC_LIBRARY_DIRS}/libicudata.a
             ${ICUI18N_LIBRARY_DIRS}/libicui18n.a
+            ${PNG_STATIC_LIB}
+            ${ZLIB_STATIC_LIB}
+            ${JPEG_STATIC_LIB}
+            ${WEBP_STATIC_LIB}
+            ${CURL_STATIC_LIB}
+            ${UV_STATIC_LIB}
+            ${OPENSSL_STATIC_LIB}
+            ${SQLITE_STATIC_LIB}
     )
 endif()