configure_make: provide (DY)LD_LIBRARY_PATH based on the dependencies

foreign_cc/private/configure_script.bzl

@@ -1,6 +1,6 @@
 # buildifier: disable=module-docstring
 load(":make_env_vars.bzl", "get_ldflags_make_vars", "get_make_env_vars")
-load(":make_script.bzl", "pkgconfig_script")
+load(":make_script.bzl", "ldpath_script", "pkgconfig_script")
 
 # buildifier: disable=function-docstring
 def create_configure_script(
@@ -33,6 +33,7 @@ def create_configure_script(
     ext_build_dirs = inputs.ext_build_dirs
 
     script = pkgconfig_script(ext_build_dirs)
+    script.extend(ldpath_script())
 
     root_path = "$$EXT_BUILD_ROOT$$/{}".format(root)
     configure_path = "{}/{}".format(root_path, configure_command)

foreign_cc/private/framework/toolchains/commands.bzl

@@ -113,6 +113,10 @@ PLATFORM_COMMANDS = {
         arguments = [],
         doc = "Print all environment variables",
     ),
+    "export_ld_library_path_var": _command_info(
+        arguments = [],
+        doc = "Export the dynamic linked additional paths env variable",
+    ),
     "export_var": _command_info(
         arguments = [
             _argument_info(name = "name", data_type = type(""), doc = "Variable name"),
@@ -128,6 +132,17 @@ PLATFORM_COMMANDS = {
             _argument_info(name = "else_text", data_type = type(""), doc = "Else block text"),
         ],
     ),
+    "increment_ld_library_path": _command_info(
+        arguments = [
+            _argument_info(
+                name = "source",
+                data_type = type(""),
+                doc = "Source directory",
+            ),
+        ],
+        doc = "Find shared libraries under the provided source directory and add them " +
+              "to (DY)LD_LIBRARY_PATH",
+    ),
     "increment_pkg_config_path": _command_info(
         arguments = [
             _argument_info(

foreign_cc/private/framework/toolchains/freebsd_commands.bzl

@@ -23,6 +23,9 @@ def pwd():
 def echo(text):
     return "echo {text}".format(text = text)
 
+def export_ld_library_path_var():
+    return "LD_LIBRARY_PATH=\"${LD_LIBRARY_PATH:-}\"; export LD_LIBRARY_PATH"
+
 def export_var(name, value):
     return "{name}={value}; export {name}".format(name = name, value = value)
 
@@ -191,6 +194,16 @@ fi
 def script_prelude():
     return "set -euo pipefail"
 
+def increment_ld_library_path(_source):
+    text = """\
+    local children=$(find "$1" -name '*.so')
+    LD_LIBRARY_PATH=""
+    for child in $children; do
+      export LD_LIBRARY_PATH="$${LD_LIBRARY_PATH:-}$$:$(dirname $child)"
+    done
+"""
+    return FunctionAndCallInfo(text = text)
+
 def increment_pkg_config_path(_source):
     text = """\
 local children=$(find "$1/" -mindepth 1 -name '*.pc')
@@ -284,8 +297,10 @@ commands = struct(
     echo = echo,
     enable_tracing = enable_tracing,
     env = env,
+    export_ld_library_path_var = export_ld_library_path_var,
     export_var = export_var,
     if_else = if_else,
+    increment_ld_library_path = increment_ld_library_path,
     increment_pkg_config_path = increment_pkg_config_path,
     local_var = local_var,
     mkdirs = mkdirs,

foreign_cc/private/framework/toolchains/linux_commands.bzl

@@ -17,6 +17,9 @@ def echo(text):
 def export_var(name, value):
     return "{name}={value}; export {name}".format(name = name, value = value)
 
+def export_ld_library_path_var():
+    return "LD_LIBRARY_PATH=\"${LD_LIBRARY_PATH:-}\"; export LD_LIBRARY_PATH"
+
 def local_var(name, value):
     return "local {name}={value}".format(name = name, value = value)
 
@@ -173,6 +176,16 @@ fi
 def script_prelude():
     return "set -euo pipefail"
 
+def increment_ld_library_path(_source):
+    text = """\
+    local children=$(find "$1" -name '*.so')
+    LD_LIBRARY_PATH=""
+    for child in $children; do
+      export LD_LIBRARY_PATH="$${LD_LIBRARY_PATH:-}$$:$(dirname $child)"
+    done
+"""
+    return FunctionAndCallInfo(text = text)
+
 def increment_pkg_config_path(_source):
     text = """\
 local children=$(find "$1" -mindepth 1 -name '*.pc')
@@ -266,8 +279,10 @@ commands = struct(
     echo = echo,
     enable_tracing = enable_tracing,
     env = env,
+    export_ld_library_path_var = export_ld_library_path_var,
     export_var = export_var,
     if_else = if_else,
+    increment_ld_library_path = increment_ld_library_path,
     increment_pkg_config_path = increment_pkg_config_path,
     local_var = local_var,
     mkdirs = mkdirs,

foreign_cc/private/framework/toolchains/macos_commands.bzl

@@ -17,6 +17,9 @@ def echo(text):
 def export_var(name, value):
     return "{name}={value}; export {name}".format(name = name, value = value)
 
+def export_ld_library_path_var():
+    return "DYLD_LIBRARY_PATH=\"${DYLD_LIBRARY_PATH:-}\"; export DYLD_LIBRARY_PATH"
+
 def local_var(name, value):
     return "local {name}={value}".format(name = name, value = value)
 
@@ -182,6 +185,15 @@ fi
 def script_prelude():
     return "set -euo pipefail"
 
+def increment_ld_library_path(_source):
+    text = """\
+    local children=$(find "$1" -name '*.dylib')
+    for child in $children; do
+      export DYLD_LIBRARY_PATH="$${DYLD_LIBRARY_PATH:-}$$:$(dirname $child)"
+    done
+"""
+    return FunctionAndCallInfo(text = text)
+
 def increment_pkg_config_path(_source):
     text = """\
 local children=$(find "$1/" -mindepth 1 -name '*.pc')
@@ -279,8 +291,10 @@ commands = struct(
     echo = echo,
     enable_tracing = enable_tracing,
     env = env,
+    export_ld_library_path_var = export_ld_library_path_var,
     export_var = export_var,
     if_else = if_else,
+    increment_ld_library_path = increment_ld_library_path,
     increment_pkg_config_path = increment_pkg_config_path,
     local_var = local_var,
     mkdirs = mkdirs,

foreign_cc/private/framework/toolchains/windows_commands.bzl

@@ -14,6 +14,9 @@ def pwd():
 def echo(text):
     return "echo {text}".format(text = text)
 
+def export_ld_library_path_var():
+    return ""
+
 def export_var(name, value):
     return "{name}={value}; export {name}".format(name = name, value = value)
 
@@ -205,6 +208,9 @@ export MSYS2_ARG_CONV_EXCL="*"
 export SYSTEMDRIVE="C:"
 """
 
+def increment_ld_library_path(_source):
+    return ""
+
 def increment_pkg_config_path(_source):
     text = """\
 local children=$($REAL_FIND "$1" -mindepth 1 -name '*.pc')
@@ -301,8 +307,10 @@ commands = struct(
     echo = echo,
     enable_tracing = enable_tracing,
     env = env,
+    export_ld_library_path_var = export_ld_library_path_var,
     export_var = export_var,
     if_else = if_else,
+    increment_ld_library_path = increment_ld_library_path,
     increment_pkg_config_path = increment_pkg_config_path,
     local_var = local_var,
     mkdirs = mkdirs,

foreign_cc/private/make_script.bzl

@@ -49,6 +49,12 @@ def create_make_script(
     script.append("##disable_tracing##")
     return script
 
+def ldpath_script():
+    script = []
+    script.append("##increment_ld_library_path## $$EXT_BUILD_DEPS$$/")
+    script.append("##export_ld_library_path_var##")
+    return script
+
 def pkgconfig_script(ext_build_dirs):
     """Create a script fragment to configure pkg-config