[libmicrohttpd] How to compile MHD for ARMv7?

Hello masters,

I'm developing an embedded HTTP server for ARM using MHD as HTTP core library, however, I couldn't compile it as static library in my Xubuntu. Below all steps I've tried:

Configuration:

configure: libmicrohttpd 0.9.52 Configuration Summary:

Cross-compiling: yes

Operating System: linux-androideabi

Threading lib: posix

Use thread names: yes

Inter-thread comm: eventfd

libcurl (testing): no, many unit tests will not run

Target directory: /usr/local

Messages: yes

Basic auth.: yes

Digest auth.: yes

Postproc: yes

HTTPS support: no (disabled)

poll support: yes

epoll support: yes

build docs: yes

build examples: yes

configure:

License : LGPL or eCos

Step 1:

./configure --host=arm-linux-androideabi --enable-shared=no --enable-static=yes --disable-https

make CFLAGS="-Wno-sign-compare -Wno-unused-parameter"

(the CFLAGS idea above was extracted from: https://android.googlesource.com/platform/external/libmicrohttpd/+/3b641bc5341bd35a4b798224d4c637c65d78ada0/Android.mk)

Error:FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:externalNativeBuildArm7Debug'.

> Build command failed.

Error while executing '/home/silvioprog/Android/Sdk/cmake/3.6.3155560/bin/cmake' with arguments {--build /home/silvioprog/Android/Projects/MyApplication/app/.externalNativeBuild/cmake/arm7Debug/armeabi-v7a --target mhd}

[1/1] Linking C shared library /home/silvioprog/Android/Projects/MyApplication/app/build/intermediates/cmake/arm7/debug/obj/armeabi-v7a/libmhd.so

FAILED: : && /home/silvioprog/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -target armv7-none-linux-androideabi -gcc-toolchain /home/silvioprog/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 --sysroot=/home/silvioprog/Android/Sdk/ndk-bundle/platforms/android-15/arch-arm -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libmhd.so -o /home/silvioprog/Android/Projects/MyApplication/app/build/intermediates/cmake/arm7/debug/obj/armeabi-v7a/libmhd.so CMakeFiles/mhd.dir/src/mhd.c.o /home/silvioprog/Android/Projects/MyApplication/app/src/main/jniLibs/armeabi-v7a/libmicrohttpd.a -lm && :

/home/silvioprog/Android/Projects/MyApplication/app/src/main/jniLibs/armeabi-v7a/libmicrohttpd.a(libmicrohttpd_la-daemon.o):daemon.c:function MHD_ip_limit_add: error: undefined reference to 'tsearch'

/home/silvioprog/Android/Projects/MyApplication/app/src/main/jniLibs/armeabi-v7a/libmicrohttpd.a(libmicrohttpd_la-daemon.o):daemon.c:function MHD_ip_limit_del: error: undefined reference to 'tfind'

/home/silvioprog/Android/Projects/MyApplication/app/src/main/jniLibs/armeabi-v7a/libmicrohttpd.a(libmicrohttpd_la-daemon.o):daemon.c:function MHD_ip_limit_del: error: undefined reference to 'tdelete'

clang: error: linker command failed with exit code 1 (use -v to see invocation)

ninja: build stopped: subcommand failed.

Step 2:

./configure --host=arm-linux-androideabi --enable-shared=no --enable-static=yes --disable-https

make

Error:FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:externalNativeBuildArm7Debug'.

> Build command failed.

[1/1] Linking C shared library /home/silvioprog/Android/Projects/MyApplication/app/build/intermediates/cmake/arm7/debug/obj/armeabi-v7a/libmhd.so

daemon.c:375: error: undefined reference to 'tfind'

daemon.c:392: error: undefined reference to 'tdelete'

daemon.c:317: error: undefined reference to 'tsearch'

clang: error: linker command failed with exit code 1 (use -v to see invocation)

ninja: build stopped: subcommand failed.

Step 3:

./configure --host=arm-linux-androideabi --enable-shared=no --enable-static=yes --disable-https --disable-curl

make CC=arm-linux-androideabi-gcc LD=arm-linux-androideabi-ld

(inspired by https://gnunet.org/mhd-on-openwrt)

Error:FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:externalNativeBuildArm7Debug'.

> Build command failed.

[1/1] Linking C shared library /home/silvioprog/Android/Projects/MyApplication/app/build/intermediates/cmake/arm7/debug/obj/armeabi-v7a/libmhd.so

daemon.c:375: error: undefined reference to 'tfind'

daemon.c:392: error: undefined reference to 'tdelete'

daemon.c:317: error: undefined reference to 'tsearch'

clang: error: linker command failed with exit code 1 (use -v to see invocation)

ninja: build stopped: subcommand failed.

Step 4:

Downloaded the package "https://archlinuxarm.org/packages/arm/libmicrohttpd", but unfortunately it distribute only the shared library that isn't compatible with my ARM version. :-/

So, what are the tricks to compile MHD for ARM? :-)

Thank you!

(I successfully compiled libcurl using this steps: https://github.com/gcesarmza/curl-android-ios, it would by nice a script like this for MHD :-) )

My environment:

$ lsb_release -a

No LSB modules are available.

Distributor ID: Ubuntu

Description: Ubuntu 16.04.2 LTS

Release: 16.04

Codename: xenial

$ arm-linux-androideabi-gcc -v

Using built-in specs.

COLLECT_GCC=arm-linux-androideabi-gcc

COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-androideabi/4.7.4/lto-wrapper

Target: arm-linux-androideabi

Configured with: ../src/configure --prefix=/usr --libexecdir=/usr/lib --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=arm-linux-androideabi --with-build-sysroot=/build/gcc-arm-linux-androideabi-LAi2yM/gcc-arm-linux-androideabi-0.20130705.1/sys-root --disable-multilib --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --disable-ppl-version-check --disable-cloog-version-check --enable-cloog-backend=ppl --disable-libssp --disable-nls --disable-libmudflap --disable-shared --disable-sjlj-exceptions --disable-libquadmath --disable-libitm --disable-libatomic --with-float=soft --with-fpu=vfp --with-arch=armv5te --enable-target-optspace --disable-docs --disable-nls --enable-threads --enable-tls --enable-libgomp --disable-libitm --disable-libatomic --disable-libstdc__-v3

Thread model: posix

gcc version 4.7.4 (Linaro GCC 4.7-2014.04-1~dev)

$ adb shell cat /proc/cpuinfo

Processor : ARMv7 Processor rev 3 (v7l)

processor : 0

BogoMIPS : 38.40

processor : 1

BogoMIPS : 38.40

processor : 2

BogoMIPS : 38.40

processor : 3

BogoMIPS : 38.40

Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt

CPU implementer : 0x41

CPU architecture: 7

CPU variant : 0x0

CPU part : 0xc07

CPU revision : 3

Hardware : Qualcomm MSM8226

Revision : 0006

Serial : 0000000000000000

Silvio Clécio

From:	silvioprog
Subject:	[libmicrohttpd] How to compile MHD for ARMv7?
Date:	Thu, 16 Feb 2017 02:42:55 -0300