I am compiling code to run on an arm neon and the make files have the following command line included.
-mcpu=cortex-a9 -march=armv7 -mfpu=neon -DARM_NEON
The details of GCC version are as follows:
gcc (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4
However when I try to compile, gcc keeps throwing the following error:
gcc: warning: '-mcpu=' is deprecated; use '-mtune=' or '-march=' instead
gcc: error: unrecognized command line option '-mfpu=neon'
I am pretty sure that the code could be compiled previously. Though a long time ago. Could it be changes in version of GCC? or is it do with 32 bit and 64 bit compilers?
I was trying to cross compile for an arm processor on my intel x86_64 Ubuntu machine. I needed to add the configuration for the host in the makefiles and use arm-linux-gnueabihf-gcc instead of gcc.
Related
I'm trying to cross compile to an arm development board. The makefile is invoking the native (x86) compiler, but passing it options that only make sense to an ARM compiler. I have the beginning of my make file as:
ARCH = arm
CC = arm-Linux-gnueabi-gcc
The error I keep getting is: arm-linux-gnueabi-gcc error unrecognized command line option '-m64'
I'm trying to cross compile GCC or clang for qnx and I am not able to find any good set of instructions that explain cross compiling to other operating systems. I already have access to qnx and a GCC compiler version 4.7 for the target.
I've tried reading http://preshing.com/20141119/how-to-build-a-gcc-cross-compiler/ and wasn't successful. I keep running into this error:
checking dynamic linker characteristics... ldqnx.so
checking how to hardcode library paths into programs... immediate
checking for shl_load... configure: error: Link tests are not allowed after GCC_NO_EXECUTABLES.
Makefile:11454: recipe for target 'configure-target-libstdc++-v3' failed
make[1]: *** [configure-target-libstdc++-v3] Error 1
I want to compile the latest stable GCC. The host machine is an x86_64 linux. The target is i486-pc-nto-qnx6.6.0. Any ideas?
I'm trying to use clang++ as drop-in replacement for G++. I'm compiling for AArch64, but for linking, clang seems to invoke the native (x86) /usr/bin/ld instead of that from AArch64 GCC suite. The clang command line looks like:
clang++ -target aarch64-linux-gnu -v \
-gcc-toolchain /path/to/aarch64/gcc \
--sysroot=/path/to/aarch64/gcc/aarch64-linux-gnu/libc \
<some other options> <obj files>
And from the verbose output, I get:
Ubuntu clang version 3.4-1ubuntu3 (tags/RELEASE_34/final) (based on LLVM 3.4)
Target: aarch64--linux-gnu
Thread model: posix
Found candidate GCC installation: /path/to/aarch64/gcc/lib/gcc/aarch64-linux-gnu/4.9.3
Selected GCC installation: /path/to/aarch64/gcc/lib/gcc/aarch64-linux-gnu/4.9.3
"/usr/bin/ld" --sysroot=/path/to/aarch64/gcc/aarch64-linux-gnu/libc ...
I don't get why clang got around choosing the native linker. The link fails for obvious reasons that object files are AArch64 ELF. Compilation lines similar to the above, but they go OK.
Any thoughts?
PS: I'm a novice clang user
I managed to find a solution: GCC accepts -B option to point to the search path where it'd try to locate the utilities. It turns out--although not documented--that clang too accepts this option. For me, having -B point to AArch64 binutils solved the problem. Another suggestion was to add the AArch64 binutils in $PATH.
I am trying to cross compile libpng for RaspberryPi on Ubuntu 14.04 (x_64) with zlib
but configure fails with
configure:11400: arm-linux-gnueabihf-gcc -o conftest -g -O2 -I/home/user/RPI_DEV/lib/include conftest.c -lz -lm >&5
/home/user/RPI_DEV/xtools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lz
collect2: error: ld returned 1 exit status
configure:11400: $? = 1
configure: failed program was:
....
Because I am using toolchain for arm, arm-ld cant find zlib.
Is there any option for configure not to compile with shared lib but to try with static lib (eg. -static -lz).
Command is
./configure --enable-static=true --enable-shared=false --with-zlib-include="/home/user/RPI_DEV/lib/include" --with-zlib-lib="/home/user/RPI_DEV/lib/lib" LDFLGS="-L/home/user/RPI_DEV/lib/lib" CPPFLAGS="-I/home/user/RPI_DEV/lib/include" -enable-static --host=arm-linux-gnueabihf --prefix=/home/user/RPI_DEV/lib --exec-prefix=/home/user/RPI_DEV/lib
You need to cross build and install zlib into your toolchain before trying to use it in another project.
What you are doing might work but only if you spell LDFLAGS correctly:
LDFLGS="-L/home/user/RPI_DEV/lib/lib"
Note the missing 'A'. I don't know why your second attempt worked, given you had the same misspelling; possibly you had a correct LDFLAGS in your environment?
Anyway there should be a Ubuntu cross-development guide somewhere that explains how to do this. It's slightly off topic but for Gentoo you use 'crossdev' to install the toolchain then a crossdev specific version of the normal package installation mechanism ([host]-emerge) to install zlib into the toolchain.
Also, the arguments --with-zlib-include and --with-zlib-lib are not supported by any current version of libpng I can find. If you are cross-compiling libpng for an RPi (or, indeed, any ARM system) you should be using the latest version of 1.6 that you can find.
Unless someone solves this the RIGHT way, this is hack I've done.
Open configure.ac file
Find and comment out line
AC_CHECK_LIB(z, zlibVersion, , AC_ERROR([zlib not installed]))
Configure will pass wihout check for zlib and then add zlib by hand
LDFLGS="-L/home/user/RPI_DEV/lib/lib -L/home/user/RPI_DEV/lib/lib/libz.a"
Run autoconf
Run ./configure ...
I compiled hello.c program for c6x architecture:
gcc-4.8 -o hello -march='c64x' hello.c
But It got an error: error: bad value (c64x) for -march= switch
Seem gcc can't recognize c64x architecture!
I am using Ubuntu 12.04 LTS & gcc-4.8 version.
Thank you!
-march=name
This specifies the name of the target architecture.
But in your case target is TI (c64x) board i.e its arm architecture. to compile your program for arm architecture you need cross-compiler. But you trying to compile on x86gcc native-compiler with option -march which is different from target target. i.e "gcc" is a native compiler. In your case it appears you are not working on an ARM host, thus "gcc" will not compile for ARM on x86.
so download the cross-compiler tool chain and then compile your program with your options.
cross compiler for ubuntu is here
http://www.filewatcher.com/m/gcc-c6x-linux-gnu-4.7.1-0.1.20120606.fc18.1.i686.rpm.10801432-0.html