Re: [uclibc-ng-devel] undefined reference to `atexit'

Hmm. Are you compiling natively on a ARM uclibc-ng system? gcc -v gcc -v hello.c -o hello

#!/bin/sh /opt/bin/gcc.real -Wl,--dynamic-linker=/opt/lib/ld-uClibc.so.1 -pipe "$@" -I/opt/include -L/opt/lib -Wl,-rpath,/opt/lib -Wl,-rpath-link,/opt/lib root@unknown:/tmp/home/root# gcc.real -v Using built-in specs. COLLECT_GCC=gcc.real COLLECT_LTO_WRAPPER=/opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/lto-wrapper Target: arm-buildroot-linux-uclibcgnueabi Configured with: ../gcc-5.3.0/configure --build=x86_64-pc-linux-gnu --host=arm-buildroot-linux-uclibcgnueabi --target=arm-buildroot-linux-uclibcgnueabi --prefix=/opt --disable-nls --disable-static --with-as=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-arm-linux-2.6.36-uclibc-ng-5.3.0/bin/arm-buildroot-linux-uclibcgnueabi-as --with-ld=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-arm-linux-2.6.36-uclibc-ng-5.3.0/bin/arm-buildroot-linux-uclibcgnueabi-ld --enable-languages=c,c++ --disable-multilib --with-gxx-include-dir=/opt/include/c++/5.3.0 --disable-__cxa_atexit --with-gnu-ld --disable-libssp --disable-libsanitizer --enable-tls --disable-libmudflap --enable-threads --without-isl --without-cloog --with-float=soft --disable-decimal-float --with-abi=aapcs-linux --with-cpu=cortex-a9 --with-mode=arm --enable-shared --disable-libgomp --with-gmp=/home/jenkins/Optware-ng/buildroot-armeabi-ng/staging/opt --with-mpfr=/home/jenkins/Optware-ng/buildroot-armeabi-ng/staging/opt --with-mpc=/home/jenkins/Optware-ng/buildroot-armeabi-ng/staging/opt --with-default-libstdcxx-abi=gcc4-compatible --with-system-zlib Thread model: posix gcc version 5.3.0 (GCC) root@unknown:/tmp/home/root# gcc -v hello.c -o hello Using built-in specs. COLLECT_GCC=/opt/bin/gcc.real COLLECT_LTO_WRAPPER=/opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/lto-wrapper Target: arm-buildroot-linux-uclibcgnueabi Configured with: ../gcc-5.3.0/configure --build=x86_64-pc-linux-gnu --host=arm-buildroot-linux-uclibcgnueabi --target=arm-buildroot-linux-uclibcgnueabi --prefix=/opt --disable-nls --disable-static --with-as=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-arm-linux-2.6.36-uclibc-ng-5.3.0/bin/arm-buildroot-linux-uclibcgnueabi-as --with-ld=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-arm-linux-2.6.36-uclibc-ng-5.3.0/bin/arm-buildroot-linux-uclibcgnueabi-ld --enable-languages=c,c++ --disable-multilib --with-gxx-include-dir=/opt/include/c++/5.3.0 --disable-__cxa_atexit --with-gnu-ld --disable-libssp --disable-libsanitizer --enable-tls --disable-libmudflap --enable-threads --without-isl --without-cloog --with-float=soft --disable-decimal-float --with-abi=aapcs-linux --with-cpu=cortex-a9 --with-mode=arm --enable-shared --disable-libgomp --with-gmp=/home/jenkins/Optware-ng/buildroot-armeabi-ng/staging/opt --with-mpfr=/home/jenkins/Optware-ng/buildroot-armeabi-ng/staging/opt --with-mpc=/home/jenkins/Optware-ng/buildroot-armeabi-ng/staging/opt --with-default-libstdcxx-abi=gcc4-compatible --with-system-zlib Thread model: posix gcc version 5.3.0 (GCC) COLLECT_GCC_OPTIONS='-pipe' '-v' '-o' 'hello' '-I' '/opt/include' '-L/opt/lib' '-mcpu=cortex-a9' '-mfloat-abi=soft' '-mabi=aapcs-linux' '-marm' '-mtls-dialect=gnu' /opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/cc1 -quiet -v -I /opt/include -imultilib . -imultiarch arm-linux-gnueabi hello.c -quiet -dumpbase hello.c -mcpu=cortex-a9 -mfloat-abi=soft -mabi=aapcs-linux -marm -mtls-dialect=gnu -auxbase hello -version -o - | /opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/as -v -I /opt/include -mcpu=cortex-a9 -mfloat-abi=soft -meabi=5 -o /tmp/ccS2W9jB.o GNU assembler version 2.25.1 (arm-buildroot-linux-uclibcgnueabi) using BFD version (GNU Binutils) 2.25.1 GNU C11 (GCC) version 5.3.0 (arm-buildroot-linux-uclibcgnueabi) compiled by GNU C version 5.3.0, GMP version 6.0.0, MPFR version 3.1.3, MPC version 1.0.2 GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 ignoring nonexistent directory "/usr/local/include/arm-linux-gnueabi" ignoring nonexistent directory "/usr/local/include" ignoring nonexistent directory "/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/include" ignoring nonexistent directory "/usr/include/arm-linux-gnueabi" ignoring nonexistent directory "/usr/include" ignoring duplicate directory "/opt/include" as it is a non-system directory that duplicates a system directory #include "..." search starts here: #include <...> search starts here: /opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/include /opt/include /opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/include-fixed End of search list. GNU C11 (GCC) version 5.3.0 (arm-buildroot-linux-uclibcgnueabi) compiled by GNU C version 5.3.0, GMP version 6.0.0, MPFR version 3.1.3, MPC version 1.0.2 GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 Compiler executable checksum: c08c84285b122b419bc5a2ddcee6c301 COMPILER_PATH=/opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/:/opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/:/opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/:/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/:/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/:/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ LIBRARY_PATH=/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/:/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/lib/:/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-pipe' '-v' '-o' 'hello' '-I' '/opt/include' '-L/opt/lib' '-mcpu=cortex-a9' '-mfloat-abi=soft' '-mabi=aapcs-linux' '-marm' '-mtls-dialect=gnu' /opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/collect2 -plugin /opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/liblto_plugin.so -plugin-opt=/opt/libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/lto-wrapper -plugin-opt=-fresolution=/tmp/ccKYWI8O.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-uClibc.so.0 -X -m armelf_linux_eabi -o hello /opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/lib/crt1.o /opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/lib/crti.o /opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/crtbegin.o -L/opt/lib -L/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0 -L/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/lib -L/opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../.. --dynamic-linker=/opt/lib/ld-uClibc.so.1 /tmp/ccS2W9jB.o -rpath /opt/lib -rpath-link /opt/lib -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/crtend.o /opt/lib/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/lib/crtn.o /tmp/ccS2W9jB.o: In function `main': hello.c:(.text+0x44): undefined reference to `atexit' collect2: error: ld returned 1 exit status

When I cross-compile your test program for ARM and then run it on qemu-system-arm, everything is fine.

/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-arm-linux-2.6.36-uclibc-ng-5.3.0/bin/arm-buildroot-linux-uclibcgnueabi-gcc -v Using built-in specs. COLLECT_GCC=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-arm-linux-2.6.36-uclibc-ng-5.3.0/bin/arm-buildroot-linux-uclibcgnueabi-gcc.br_real COLLECT_LTO_WRAPPER=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-arm-linux-2.6.36-uclibc-ng-5.3.0/bin/../libexec/gcc/arm-buildroot-linux-uclibcgnueabi/5.3.0/lto-wrapper Target: arm-buildroot-linux-uclibcgnueabi Configured with: ./configure --prefix=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-2016.02/output/host/usr --sysconfdir=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-2016.02/output/host/etc --enable-static --target=arm-buildroot-linux-uclibcgnueabi --with-sysroot=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-arm-linux-2.6.36-uclibc-ng-5.3.0/arm-buildroot-linux-uclibcgnueabi/sysroot --disable-__cxa_atexit --with-gnu-ld --disable-libssp --disable-multilib --with-gmp=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-2016.02/output/host/usr --with-mpfr=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-2016.02/output/host/usr --with-pkgversion='Buildroot 2016.02-g5068547' --with-bugurl= http://bugs.buildroot.net/ --disable-libsanitizer --enable-tls --disable-libmudflap --enable-threads --with-mpc=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-2016.02/output/host/usr --without-isl --without-cloog --with-float=soft --disable-decimal-float --with-abi=aapcs-linux --with-cpu=cortex-a9 --with-float=soft --with-mode=arm --enable-languages=c,c++ --with-build-time-tools=/home/jenkins/Optware-ng/buildroot-armeabi-ng/toolchain/buildroot-2016.02/output/host/usr/arm-buildroot-linux-uclibcgnueabi/bin --enable-shared --disable-libgomp --with-default-libstdcxx-abi=gcc4-compatible Thread model: posix gcc version 5.3.0 (Buildroot 2016.02-g5068547)