已指定目录但链接器仍无法找到静态库问题求助

我在将静态库libkeypad.a集成到项目时遇到问题：使用gcc编译正常，但链接阶段ld始终无法找到该库。

链接命令及错误输出 #

arm-unknown-linux-gnueabihf-g++ -std=c++11 -ggdb -Wall -Wextra -Wmultichar -O1 -fstack-protector-all -mfpu=neon -mfloat-abi=hard main.o vfd.o relay.o keypad.o receiver.o widgets.o tmc.o database.o sound.o ProceduralTimerTaskAdapter.o cd.o TrafficMessage.o -o autoradio -L $(shell pwd):${HOME}/x-tools/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot/usr/lib/arm-linux-gnueabihf:${HOME}/x-tools/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot/lib/arm-linux-gnueabihf:${HOME}/x-tools/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot/usr/lib:/usr/lib -Wl,-rpath-link=$(shell pwd):${HOME}/x-tools/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot/usr/lib/arm-linux-gnueabihf:${HOME}/x-tools/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot/lib/arm-linux-gnueabihf:${HOME}/x-tools/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot/usr/lib -lpthread -lkeystonecomm -lgps -lpigpio -lpigpiod_if2 -lrt -lGeographic -lmk4 -lcsvparser -lasound -lespeak-ng -lmpg123 -lout123 -lPocoFoundation -lPocoUtil -lcdio++ -lcdio -lserial -lkeypad
/home/jacek/x-tools/arm-unknown-linux-gnueabihf/lib/gcc/arm-unknown-linux-gnueabihf/8.3.0/../../../../arm-unknown-linux-gnueabihf/bin/ld.bfd: cannot find -lkeypad
collect2: error: ld returned 1 exit status
make: *** [Makefile:24: autoradio] Fehler 1

库文件信息 #

• 库文件名：libkeypad.a
• 存放位置：执行make命令的当前目录（$(shell pwd)）

已尝试的操作 #

• 参考过静态库集成相关教程的建议，但引入后出现大量未定义引用
• 无法修改该库文件，为直接获取的成品

Rust编译器生成的C++接口文件 #

#include <cstdarg>
#include <cstdint>
#include <cstdlib>
#include <ostream>
#include <new>

enum class Lock {
  Locked = 0,
  Unlocked = 1,
  UnlockedPowerOnly = 2,
};

struct Keypad;
using KpCallback = void(*)(char, uint32_t);

extern "C" {
Keypad *keypad_new();
void keypad_delete(Keypad *kp);
int keypad_init(Keypad *kp);
void keypad_run(Keypad *kp);
void keypad_set_lock(Keypad *kp, Lock lock);
Lock keypad_get_lock(Keypad *kp);
void keypad_set_on_pressed(Keypad *kp, KpCallback callback, uint32_t arg);
void keypad_set_on_released(Keypad *kp, KpCallback callback, uint32_t arg);
}  // extern "C"

内容的提问来源于stack exchange，提问作者Neppomuk