Build error on ARM device due to ld flags
Sebastian Gottschall
s.gottschall at newmedia-net.de
Thu Jan 24 10:40:47 CET 2019
the kernel makefiles used for building on different architectures can be
very different. (see kernel sourcdir/arch/arm/Makefile or arch/x86/Makefile)
so some of them might also overwrite existing flags. what makes me
wonder. according to your build log you're setting various flags before
entering the wireguard dir and compiling.
why?
Am 24.01.2019 um 09:57 schrieb John:
> Thank you for the reply. What is odd is that I can build just fine on
> Arch x86_64 which uses the identical LDFLAGS. In any case, is your
> recommendation to drop the -Wl portion of the LDFLAGS or so unset all
> ie:
>
> unset CPPFLAGS CFLAGS CXXFLAGS LDFLAGS DEBUG_CFLAGS DEBUG_CXXFLAGS
>
> On Wed, Jan 23, 2019 at 11:02 PM Sebastian Gottschall
> <s.gottschall at newmedia-net.de> wrote:
>> -Wl etc is not a valid linker flag, its a flag for gcc which passes the
>> following flags to the linker. so basicly the LDFLAGS are just wrong.
>> in general no CFLAGS or LDFLAGS should be overriden, since wireguard
>> uses exact he same flags which is used for compiling the kernel. so setting
>> custom flags should be avoided
>>
>> Am 23.01.2019 um 22:07 schrieb John:
>>> I am running Arch ARM (aarch64) on an ODROID-C2 using gcc v8.2.1.
>>> Arch ARM which ships with the following LDFLAGS as defaults,
>>> "-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now"
>>>
>>> When I build wireguard on this device as shown below, I get this error
>>> but am unsure why:
>>>
>>> ld: unrecognized option '-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
>>> ld: use the --help option for usage information
>>> make[2]: *** [scripts/Makefile.build:393:
>>> /scratch/WireGuard-0.0.20190123/src/wireguard.o] Error 1
>>> make[1]: *** [Makefile:1358:
>>> _module_/scratch/WireGuard-0.0.20190123/src] Error 2
>>> make: *** [Makefile:36: module] Error 2
>>>
>>> If I remove the '-Wl' switch from the distro default, it builds
>>> without error. Any advice is appreciated.
>>>
>>> Complete build log and my FLAGS:
>>>
>>> % export CPPFLAGS="-D_FORTIFY_SOURCE=2"
>>> % export CFLAGS="-march=armv8-a -O2 -pipe -fstack-protector-strong -fno-plt"
>>> % export CXXFLAGS="-march=armv8-a -O2 -pipe -fstack-protector-strong -fno-plt"
>>> % export LDFLAGS="-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now"
>>> % export DEBUG_CFLAGS="-g -fvar-tracking-assignments"
>>> % export DEBUG_CXXFLAGS="-g -fvar-tracking-assignments"
>>>
>>> % cd WireGuard-0.0.20190123
>>> % make -j5 -C src
>>> make: Entering directory '/scratch/WireGuard-0.0.20190123/src'
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/wg.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/config.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/show.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/terminal.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/ipc.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/mnlg.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/encoding.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/curve25519.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/setconf.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/genkey.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/showconf.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/pubkey.o
>>> CC /scratch/WireGuard-0.0.20190123/src/tools/set.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/main.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/device.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/noise.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/peer.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/timers.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/queueing.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/send.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/receive.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/socket.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/hashtables.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/allowedips.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/ratelimiter.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/cookie.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/netlink.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/crypto/zinc/chacha20/chacha20.o
>>> PERLASM /scratch/WireGuard-0.0.20190123/src/crypto/zinc/chacha20/chacha20-arm64.S
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/crypto/zinc/poly1305/poly1305.o
>>> PERLASM /scratch/WireGuard-0.0.20190123/src/crypto/zinc/poly1305/poly1305-arm64.S
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/crypto/zinc/chacha20poly1305.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/crypto/zinc/blake2s/blake2s.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/crypto/zinc/curve25519/curve25519.o
>>> LD /scratch/WireGuard-0.0.20190123/src/tools/wg
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/compat/siphash/siphash.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/compat/dst_cache/dst_cache.o
>>> CC [M] /scratch/WireGuard-0.0.20190123/src/compat/udp_tunnel/udp_tunnel.o
>>> AS [M] /scratch/WireGuard-0.0.20190123/src/crypto/zinc/chacha20/chacha20-arm64.o
>>> AS [M] /scratch/WireGuard-0.0.20190123/src/crypto/zinc/poly1305/poly1305-arm64.o
>>> LD [M] /scratch/WireGuard-0.0.20190123/src/wireguard.o
>>> ld: unrecognized option '-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
>>> ld: use the --help option for usage information
>>> make[2]: *** [scripts/Makefile.build:393:
>>> /scratch/WireGuard-0.0.20190123/src/wireguard.o] Error 1
>>> make[1]: *** [Makefile:1358:
>>> _module_/scratch/WireGuard-0.0.20190123/src] Error 2
>>> make: *** [Makefile:36: module] Error 2
>>> make: Leaving directory '/scratch/WireGuard-0.0.20190123/src'
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