我正在尝试使用autoconf进行交叉编译。我已经参考了以下帮助文档：
这是所有ARM工具链二进制文件的目录。
- https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Hosts-and-Cross_002dCompilation.html
- https://www.gnu.org/software/autoconf/manual/autoconf-2.65/html_node/Specifying-Target-Triplets.html
- https://github.com/jedisct1/libsodium/issues/274
- Cross Compiling For ARM With Autoconf
./configure --build=x86_64-linux-gnu --host=/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf --target=/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf --disable-shared --disable-documentation
但是，在自动配置工具检查了编译所必需的gcc和其他内容后，它并没有找到它们。尽管它们已经存在于目录中。
因此，日志如下：
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-strip... no
checking for strip... strip
configure: WARNING: using cross tools not prefixed with host triplet
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc... no
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether gcc understands -c and -o together... yes
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-ar... no
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-lib... no
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-link... no
checking for ar... ar
checking the archiver (ar) interface... ar
checking build system type... x86_64-pc-linux-gnu
checking host system type... Invalid configuration `/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf': machine `/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm' not recognized
configure: error: /bin/bash ./config.sub /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf failed
这是所有ARM工具链二进制文件的目录。
host@ubuntu:/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin$ ls
arm-linux-gnueabihf-addr2line arm-linux-gnueabihf-gcc arm-linux-gnueabihf-gfortran arm-linux-gnueabihf-readelf
arm-linux-gnueabihf-ar arm-linux-gnueabihf-gcc-5.4.1 arm-linux-gnueabihf-gprof arm-linux-gnueabihf-size
arm-linux-gnueabihf-as arm-linux-gnueabihf-gcc-ar arm-linux-gnueabihf-ld arm-linux-gnueabihf-strings
arm-linux-gnueabihf-c++ arm-linux-gnueabihf-gcc-nm arm-linux-gnueabihf-ld.bfd arm-linux-gnueabihf-strip
arm-linux-gnueabihf-c++filt arm-linux-gnueabihf-gcc-ranlib arm-linux-gnueabihf-nm gdbserver
arm-linux-gnueabihf-cpp arm-linux-gnueabihf-gcov arm-linux-gnueabihf-objcopy runtest
arm-linux-gnueabihf-elfedit arm-linux-gnueabihf-gcov-tool arm-linux-gnueabihf-objdump
arm-linux-gnueabihf-g++ arm-linux-gnueabihf-gdb arm-linux-gnueabihf-ranlib
有什么建议吗？
编辑 我尝试了Chrono提出的解决方案，它能够找到ARM工具链。但是另一个问题出现了：
添加符号时出错：文件格式无法识别
libtool: link: arm-linux-gnueabihf-gcc -shared -fPIC -DPIC src/.libs/libcoap_1_la-address.o src/.libs/libcoap_1_la-async.o src/.libs/libcoap_1_la-block.o src/.libs/libcoap_1_la-coap_dtls.o src/.libs/libcoap_1_la-coap_event.o src/.libs/libcoap_1_la-coap_keystore.o src/.libs/libcoap_1_la-coap_time.o src/.libs/libcoap_1_la-debug.o src/.libs/libcoap_1_la-encode.o src/.libs/libcoap_1_la-hashkey.o src/.libs/libcoap_1_la-mem.o src/.libs/libcoap_1_la-net.o src/.libs/libcoap_1_la-option.o src/.libs/libcoap_1_la-pdu.o src/.libs/libcoap_1_la-resource.o src/.libs/libcoap_1_la-str.o src/.libs/libcoap_1_la-subscribe.o src/.libs/libcoap_1_la-uri.o src/platform/posix/.libs/libcoap_1_la-coap_io.o src/platform/posix/.libs/libcoap_1_la-prng.o src/platform/posix/.libs/libcoap_1_la-run.o -L./ext/tinydtls -ltinydtls -g -O2 -Wl,--version-script=./libcoap-1.map -Wl,-soname -Wl,libcoap-1.so.0 -o .libs/libcoap-1.so.0.0.0
这行代码编译时出错：
./ext/tinydtls/libtinydtls.a: error adding symbols: File format not recognized
编辑2：
问题出在库上，它没有正确地将交叉编译器参数传递给autoconf，因此出现了这个问题。