我对交叉编译没什么问题。 到目前为止，我在LPC2378 IC上使用ARM7裸机，并且从WinXP上的Eclipse内部构建器编译二进制文件。
现在我需要更改系统，所以我尝试在新计算机上编译它，这不起作用：在elf文件中编译后，缺少许多符号（工作有〜500kb，无法工作〜10kb，也检查了objdump），但没有错误。
例如，在elf中，我找不到对主函数的引用。
在两种情况下，我都使用arm-none-eabi工具链。在新机器上，我尝试使用最新版本的工具链（在Ubuntu 20.04 64b WindowsSubshellLinux上交叉编译），并且与旧机器相同（在4.9，在Ubuntu32b上交叉编译，虚拟机）。
使用了编译命令：
编译源代码：
arm-none-eabi-g++ -mcpu=arm7tdmi-s -march=armv4t -marm -mlittle-endian -mfloat-abi=soft -Os -fmessage-length=0 -ffunction-sections -fdata-sections -std=gnu++11 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -Wunused -Wuninitialized -Wextra -Wconversion -Wpointer-arith -Wpadded -Wshadow -Wlogical-op -Wfloat-equal -Wall -Wabi -Wctor-dtor-privacy -Wnoexcept -Wnon-virtual-dtor -Wstrict-null-sentinel -Wsign-promo -Weffc++ <my_local_flags> -I<paths_to_includes> -c -o <path_to_o_file> <path_to_cpp_source>
arm-none-eabi-gcc -mcpu=arm7tdmi-s -march=armv4t -marm -mlittle-endian -mfloat-abi=soft -Os -fmessage-length=0 -ffunction-sections -fdata-sections -std=gnu11 -Wunused -Wuninitialized -Wextra -Wconversion -Wpointer-arith -Wpadded -Wshadow -Wlogical-op -Wfloat-equal -Wall -Wstrict-prototypes -Wbad-function-cast <my_local_flags> -I<paths_to_includes> -c -o <path_to_o_file> <path_to_c_source>
链接：
arm-none-eabi-g++ -mcpu=arm7tdmi-s -march=armv4t -marm -mlittle-endian -mfloat-abi=soft -Os -fmessage-length=0 -ffunction-sections -fdata-sections -Wunused -Wuninitialized -Wextra -Wconversion -Wpointer-arith -Wpadded -Wshadow -Wlogical-op -Wfloat-equal -Wall -T<path_to_linker_script> -Xlinker --gc-sections -Wl,-Map,<path_to_map> -o <path_to_elf_file> <paths_to_o_files>
路径：
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/mnt/c/ProgramFiles/WindowsApps/CanonicalGroupLimited.UbuntuonWindows_2004.2020.424.0_x64__79rhkp1fndgsc:/mnt/c/Windows/system32:/mnt/c/Windows:/mnt/c/Windows/System32/Wbem:/mnt/c/Windows/System32/WindowsPowerShell/v1.0/:/mnt/c/Windows/System32/OpenSSH/:/mnt/c/Users/user/AppData/Local/Microsoft/WindowsApps:/home/user/env/gcc-arm-none-eabi/9-2020-q2-update/bin
工具链已作为预编译的二进制文件从官方网站（https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads https://launchpad.net/gcc-arm-embedded/）下载
有人有类似的问题吗？ 感谢您的帮助
更新：
我使用arm工具链中的readelf读取了两个elf文件，其中一个没有入口点：
工作精灵：
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x3000
Start of program headers: 52 (bytes into file)
Start of section headers: 538908 (bytes into file)
Flags: 0x5000202, has entry point, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 4
Size of section headers: 40 (bytes)
Number of section headers: 14
Section header string table index: 11
不起作用的小精灵：
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x3000
Start of program headers: 52 (bytes into file)
Start of section headers: 82820 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 4
Size of section headers: 40 (bytes)
Number of section headers: 14
Section header string table index: 13
使用g ++标志（-fdata-sections，-Xlinker --gc-sections，命令末尾的-T）进行操作无济于事。