我试图用autoconf交叉编译。 我试过这些帮助：
https://www.gnu.org/software/autoconf/manual/autoconf-2.65/html_node/Specifying-Target-Triplets.html
并做了 -
./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autoconf工具检查gcc和编译所需的其他东西后，它找不到这些。虽然它们已经存在于目录中。
所以日志是：
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 $(MAKE)... yes
checking whether make supports nested variables... yes
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc... no
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether gcc understands -c and -o together... yes
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-ar... no
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-lib... no
checking for /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-link... no
checking for ar... ar
checking the archiver (ar) interface... ar
checking build system type... x86_64-pc-linux-gnu
checking host system type... Invalid configuration `/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf': machine `/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm' not recognized
configure: error: /bin/bash ./config.sub /opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf failed
这是所有arm toolchain bin的目录
host@ubuntu:/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin$ 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？
修改 我尝试了Chrono建议的解决方案。它能够找到手臂工具链。但是出现了另一个问题：
错误添加符号：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
对于这行编译，错误是：
./ext/tinydtls/libtinydtls.a: error adding symbols: File format not recognized
编辑2：
问题在于库没有正确地将交叉编译器参数传递给autoconf，因此存在问题。
答案 0 :(得分：1)
确保包含工具链二进制文件的目录位于$PATH：
export OLDPATH=$PATH
export PATH=$OLDPATH:/opt/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_arm-linux-gnueabihf/bin
除非您退出或以其他方式退出终端会话，否则您只需要执行一次。
完成后，您可以正确配置：
./configure \
--build=x86_64-linux-gnu \
--host=arm-linux-gnueabihf \
--target=arm-linux-gnueabihf \
--disable-shared \
--disable-documentation