Re: Can not compile program on ARMv7 native platform

[Rob MacKinnon <rob.mackinnon@xxxxxxxxx>]

If you're getting into compilation of code, definitely check out the GCC man page and docs.  Not sure your what GCC version you're using (btw on some libraries it matters), but the following is for v4.9.4.  It sounds like you're include paths do not have the correct path for the location of the libftdi headers. Read up the following and check your includes.

GCC Man Page:
https://linux.die.net/man/1/gcc

GCC Documentation:
https://gcc.gnu.org/onlinedocs/gcc-4.9.4/gcc/

On Sat, Oct 1, 2016 at 2:09 AM, mackowiakp <mackowiakp@xxxxx> wrote:

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




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