Dear community, I'm trying to replace all the occurences of __clock_gettime with __clock_gettime64 to avoid time bugs on archs with __WORDSIZE == 32 && __TIMESIZE != 64 (for now I've omitted the conversion of ntpl, pthreads,sunrpc) I've modified: sysdeps/generic/memusage.h (the GETTIME preprocessor macro). Unfortunately, several glibc builds fail: arm-glibc-linux-gnueabi-gcc -shared -static-libgcc -Wl,-O1 -Wl,-z,defs -Wl,-dynamic-linker=/lib/ld-linux.so.3 -B/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/csu/ -Wl,-soname=libmemusage.so -Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style =both -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/math -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/elf -L/home/lukma/work/ glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/dlfcn -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/nss -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/nis -L/home/lukma/work/glibc/glibc-many-build /build/glibcs/arm-linux-gnueabi/glibc/rt -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/resolv -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/mathvec -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm- linux-gnueabi/glibc/support -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/crypt -L/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/nptl -Wl,-rpath-link=/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-lin ux-gnueabi/glibc:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/math:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/elf:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/dlfcn:/home/lukm a/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/nss:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/nis:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/rt:/home/lukma/work/glibc/glibc-many-build/b uild/glibcs/arm-linux-gnueabi/glibc/resolv:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/mathvec:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/support:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-lin ux-gnueabi/glibc/crypt:/home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/nptl -o /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/malloc/libmemusage.so -T /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux- gnueabi/glibc/shlib.lds /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/csu/abi-note.o -Wl,--whole-archive /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/malloc/libmemusage_pic.a -Wl,--no-whole-archive /home/lukma/ work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/dlfcn/libdl.so.2 -Wl,--start-group /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/libc.so /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/libc_nons hared.a -Wl,--as-needed /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/elf/ld.so -Wl,--no-as-needed -Wl,--end-group /work/lukma/glibc/glibc-many-build/install/compilers/arm-linux-gnueabi/bin/../lib/gcc/arm-glibc-linux-gnueabi/9.2.1/../../../../arm-glibc-linux-gnueabi/bin/ld: /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/malloc/libmemusage_pic.a(memusage.os ): in function `update_data': /work/lukma/glibc/glibc-many-build/src/glibc/malloc/memusage.c:181: undefined reference to `__clock_gettime64' /work/lukma/glibc/glibc-many-build/install/compilers/arm-linux-gnueabi/bin/../lib/gcc/arm-glibc-linux-gnueabi/9.2.1/../../../../arm-glibc-linux-gnueabi/bin/ld: /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/malloc/libmemusage_pic.a(memusage.os ): in function `me': /work/lukma/glibc/glibc-many-build/src/glibc/malloc/memusage.c:271: undefined reference to `__clock_gettime64' /work/lukma/glibc/glibc-many-build/install/compilers/arm-linux-gnueabi/bin/../lib/gcc/arm-glibc-linux-gnueabi/9.2.1/../../../../arm-glibc-linux-gnueabi/bin/ld: /home/lukma/work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/malloc/libmemusage_pic.a(memusage.os ): in function `dest': /work/lukma/glibc/glibc-many-build/src/glibc/malloc/memusage.c:822: undefined reference to `__clock_gettime64' collect2: error: ld returned 1 exit status This is what I see from the local build directory: nm ./work/glibc/glibc-many-build/build/glibcs/arm-linux-gnueabi/glibc/libc.so | grep clock_gettime 0009a8e0 T __clock_gettime 0009a8e0 t __clock_gettime_2 0009a774 t __clock_gettime64 0009a8e0 T clock_gettime@@GLIBC_2.17 0009a8e0 T clock_gettime@GLIBC_2.4 0009a8e0 t __GI___clock_gettime 0009a774 t __GI___clock_gettime64 Apparently the __clock_gettime64 is a local symbol in the libc.so. However, I've checked how it looks on the installed glibc: root@y2038arm:/opt# nm /opt/lib/libc.so.6 | grep clock_gettime 000702bc t __GI___clock_gettime 00070264 t __GI___clock_gettime64 000702bc T __clock_gettime 00070264 T __clock_gettime64 000702bc t __clock_gettime_2 000702bc T clock_gettime@@GLIBC_2.17 000702bc T clock_gettime@GLIBC_2.4 In the installed glibc the __clock_gettime64 is an external symbol. Why the symbol (__clock_gettime64) is local when I try to link malloc/libmemusage.so and then it becomes global when glibc is installed? In other parts of the glibc - for example sysdeps/unix/sysv/linux/clock.c I can use __clock_gettime64 without any issues. Is such behavior related to strong_allias() declaration (as for example in __clock_settime for which we do have similar situation)? Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de