Sorry for my ignorance, but I just started with libFTDI. OK. I download ftdi.h from http://www.intra2net.com/en/developer/libftdi/download.php and place it in /opt/include. OpenWTR does not provide libftdi1-dev. Now I try to compile program again using the same compiler command. That is:
gcc -v -Wl,-rpath=/opt/usr/local/lib -Wl,--dynamic-linker=/opt/lib/ld-linux.so.3 -L/opt/lib -O2 -pipe -march=armv7-a -mtune=cortex-a9 -fno-caller-saves -mfloat-abi=soft -l ftdi1 d.c -o d It fails because "/opt/bin/ld: cannot find -lftdi1". But there is /opt/usr/local/lib/libftdi1.so linked to libftdi1.so.2 My LD_LIBRARY_PATH looks like this: /lib:/usr/lib:/usr/local/lib:/opt/lib:/opt/usr/lib:/opt/include:/opt/usr/local/lib:/opt/usr/include So what the problem is? Below output from compilation process: Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/lto-wrapper Target: arm-openwrt-linux-gnueabi Configured with: /media/ware3/Entware-ng.2016.08/build_dir/target-arm_cortex-a9_glibc-2.23_eabi/gcc-5.4.0/configure --target=arm-openwrt-linux --host=arm-openwrt-linux --build=x86_64-linux-gnu --program-prefix= --program-suffix= --prefix=/opt --exec-prefix=/opt --bindir=/opt/bin --sbindir=/opt/sbin --libexecdir=/opt/lib --sysconfdir=/opt/etc --datadir=/opt/share --localstatedir=/opt/var --mandir=/opt/man --infodir=/opt/info --disable-nls --build=x86_64-linux-gnu --host=arm-openwrt-linux-gnueabi --target=arm-openwrt-linux-gnueabi --enable-languages=c,c++ --with-bugurl=https://dev.openwrt.org/ --with-pkgversion='OpenWrt GCC 5.4.0' --enable-shared --enable-__cxa_atexit --with-default-libstdcxx-abi=gcc4-compatible --enable-target-optspace --with-gnu-ld --with-stage1-ldflags='-Wl,-rpath=/opt/lib -Wl,--dynamic-linker=/opt/lib/ld-linux.so.3' --with-boot-ldflags='static-libstdc++ -static-libgcc -Wl,-rpath=/opt/lib -Wl,--dynamic-linker=/opt/lib/ld-linux.so.3' --disable-nls --disable-libsanitizer --disable-libvtv --disable-libcilkrts --disable-libmudflap --disable-multilib --disable-libgomp --disable-libquadmath --disable-libssp --disable-decimal-float --disable-libstdcxx-pch --with-host-libstdcxx=-lstdc++ --prefix=/opt --libexecdir=/opt/lib --with-local-prefix=/opt --with-float=soft --with-default-libstdcxx-abi=gcc4-compatible Thread model: posix gcc version 5.4.0 (OpenWrt GCC 5.4.0) COLLECT_GCC_OPTIONS='-v' '-L/opt/lib' '-O2' '-pipe' '-march=armv7-a' '-mtune=cortex-a9' '-fno-caller-saves' '-mfloat-abi=soft' '-o' 'd' '-mtls-dialect=gnu' /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/cc1 -quiet -v -imultilib . -imultiarch arm-linux-gnueabi d.c -quiet -dumpbase d.c -march=armv7-a -mtune=cortex-a9 -mfloat-abi=soft -mtls-dialect=gnu -auxbase d -O2 -version -fno-caller-saves -o - | as -v -march=armv7-a -mfloat-abi=soft -meabi=5 -o /opt/tmp/ccbT3J1L.o GNU assembler version 2.26.1 (arm-openwrt-linux-gnueabi) using BFD version (GNU Binutils) 2.26.1 GNU C11 (OpenWrt GCC 5.4.0) version 5.4.0 (arm-openwrt-linux-gnueabi) compiled by GNU C version 5.4.0, GMP version 4.3.2, MPFR version 2.4.2, MPC version 0.8.1 GGC heuristics: --param ggc-min-expand=47 --param ggc-min-heapsize=31954 ignoring nonexistent directory "/opt/include/arm-linux-gnueabi" ignoring nonexistent directory "/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/../../../../arm-openwrt-linux-gnueabi/include" ignoring nonexistent directory "/usr/include/arm-linux-gnueabi" ignoring nonexistent directory "/usr/include" #include "..." search starts here: #include <...> search starts here: /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/include /opt/include /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/include-fixed End of search list. GNU C11 (OpenWrt GCC 5.4.0) version 5.4.0 (arm-openwrt-linux-gnueabi) compiled by GNU C version 5.4.0, GMP version 4.3.2, MPFR version 2.4.2, MPC version 0.8.1 GGC heuristics: --param ggc-min-expand=47 --param ggc-min-heapsize=31954 Compiler executable checksum: a589712d81e28a1300ccb0e03d994135 d.c: In function 'main': d.c:4:18: warning: implicit declaration of function 'Sleep' [-Wimplicit-function-declaration] #define sleep(x) Sleep(x) ^ d.c:34:5: note: in expansion of macro 'sleep' sleep(3); ^ COMPILER_PATH=/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/:/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/:/opt/lib/gcc/arm-openwrt-linux-gnueabi/:/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/:/opt/lib/gcc/arm-openwrt-linux-gnueabi/ LIBRARY_PATH=/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/:/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-v' '-L/opt/lib' '-O2' '-pipe' '-march=armv7-a' '-mtune=cortex-a9' '-fno-caller-saves' '-mfloat-abi=soft' '-o' 'd' '-mtls-dialect=gnu' /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/collect2 -plugin /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/liblto_plugin.so -plugin-opt=/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/lto-wrapper -plugin-opt=-fresolution=/opt/tmp/cc87OOFR.res -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --eh-frame-hdr -dynamic-linker /lib/ld-linux.so.3 -X -m armelf_linux_eabi -o d /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/crt1.o /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/crti.o /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/crtbegin.o -L/opt/lib -L/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0 -L/opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/../../.. -rpath=/opt/usr/local/lib --dynamic-linker=/opt/lib/ld-linux.so.3 -lftdi1 /opt/tmp/ccbT3J1L.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/crtend.o /opt/lib/gcc/arm-openwrt-linux-gnueabi/5.4.0/crtn.o /opt/bin/ld: cannot find -lftdi1 collect2: error: ld returned 1 exit status -- View this message in context: http://libftdi.141977.n3.nabble.com/Can-not-compile-program-on-ARMv7-native-platform-tp4026111p4026113.html Sent from the libFTDI mailing list archive at Nabble.com. -- libftdi - see http://www.intra2net.com/en/developer/libftdi for details. 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