What does config.log say? I think ./configure usually tries to compile a 
program using that function, and fails if the program couldn't be linked.

On Wednesday, December 27, 2017 at 11:25:26 AM UTC-8, Amandeep Gautam wrote:
>
> Reposting from here <https://github.com/google/protobuf/issues/4101>.
>
> I am unable to build protobuf from source on AIX 7.2. The configure script 
> fails saying that sched_yield was not found on the system. However it seems 
> that ```sched_yield``` is present as ```man sched_yield``` bring up the 
> corresponding man page.
>
> ```
> bash-4.4# ./configure --prefix=/opt/cohesity
> checking whether to enable maintainer-specific portions of Makefiles... yes
> checking build system type... powerpc-ibm-aix7.2.1.0
> checking host system type... powerpc-ibm-aix7.2.1.0
> checking target system type... powerpc-ibm-aix7.2.1.0
> checking for a BSD-compatible install... ./install-sh -c
> checking whether build environment is sane... yes
> checking for a thread-safe mkdir -p... ./install-sh -c -d
> checking for gawk... no
> checking for mawk... no
> checking for nawk... nawk
> checking whether make sets $(MAKE)... yes
> checking whether make supports nested variables... yes
> checking whether UID '0' is supported by ustar format... yes
> checking whether GID '0' is supported by ustar format... yes
> checking how to create a ustar tar archive... gnutar
> checking for gcc... gcc
> checking whether the C compiler works... yes
> checking for C compiler default output file name... a.out
> checking for suffix of executables... 
> checking whether we are cross compiling... no
> checking for suffix of object files... o
> checking whether we are using the GNU C compiler... yes
> checking whether gcc accepts -g... yes
> checking for gcc option to accept ISO C89... none needed
> checking whether gcc understands -c and -o together... yes
> checking for style of include used by make... GNU
> checking dependency style of gcc... gcc3
> checking for g++... no
> checking for c++... no
> checking for gpp... no
> checking for aCC... no
> checking for CC... no
> checking for cxx... no
> checking for cc++... no
> checking for cl.exe... no
> checking for FCC... no
> checking for KCC... no
> checking for RCC... no
> checking for xlC_r... no
> checking for xlC... no
> checking whether we are using the GNU C++ compiler... no
> checking whether g++ accepts -g... no
> checking dependency style of g++... none
> checking how to run the C++ preprocessor... /lib/cpp
> checking for grep that handles long lines and -e... /usr/bin/grep
> checking for egrep... /usr/bin/grep -E
> checking for ANSI C header files... no
> checking for sys/types.h... no
> checking for sys/stat.h... no
> checking for stdlib.h... no
> checking for string.h... no
> checking for memory.h... no
> checking for strings.h... no
> checking for inttypes.h... no
> checking for stdint.h... no
> checking for unistd.h... no
> checking minix/config.h usability... no
> checking minix/config.h presence... no
> checking for minix/config.h... no
> checking whether it is safe to define __EXTENSIONS__... no
> checking for ar... ar
> checking the archiver (ar) interface... ar
> checking for gcc... gcc
> checking whether we are using the GNU Objective C compiler... no
> checking whether gcc accepts -g... no
> checking dependency style of gcc... gcc3
> checking C++ compiler flags...... use default: -O2  -g -DNDEBUG
> checking whether __SUNPRO_CC is declared... no
> checking how to print strings... print -r
> checking for a sed that does not truncate output... /usr/bin/sed
> checking for fgrep... /usr/bin/grep -F
> checking for ld used by gcc... /usr/bin/ld
> checking if the linker (/usr/bin/ld) is GNU ld... no
> checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
> checking the name lister (/usr/bin/nm -B) interface... BSD nm
> checking whether ln -s works... yes
> checking the maximum length of command line arguments... 786432
> checking how to convert powerpc-ibm-aix7.2.1.0 file names to 
> powerpc-ibm-aix7.2.1.0 format... func_convert_file_noop
> checking how to convert powerpc-ibm-aix7.2.1.0 file names to toolchain 
> format... func_convert_file_noop
> checking for /usr/bin/ld option to reload object files... -r
> checking for objdump... no
> checking how to recognize dependent libraries... pass_all
> checking for dlltool... no
> checking how to associate runtime and link libraries... print -r --
> checking for archiver @FILE support... no
> checking for strip... strip
> checking for ranlib... ranlib
> checking command to parse /usr/bin/nm -B output from gcc object... failed
> checking for sysroot... no
> checking for a working dd... /usr/bin/dd
> checking how to truncate binary pipes... /usr/bin/dd bs=4096 count=1
> checking for mt... mt
> checking if mt is a manifest tool... no
> checking for dlfcn.h... no
> checking which variant of shared library versioning to provide... aix
> checking for objdir... .libs
> checking if gcc supports -fno-rtti -fno-exceptions... no
> checking for gcc option to produce PIC... -fPIC -DPIC
> checking if gcc PIC flag -fPIC -DPIC works... yes
> checking if gcc static flag -static works... no
> checking if gcc supports -c -o file.o... yes
> checking if gcc supports -c -o file.o... (cached) yes
> checking whether the gcc linker (/usr/bin/ld) supports shared libraries... 
> yes
> checking dynamic linker characteristics... AIX lib.a(lib.so.V)
> checking how to hardcode library paths into programs... immediate
> checking whether stripping libraries is possible... no
> checking if libtool supports shared libraries... yes
> checking whether to build shared libraries... yes
> checking whether to build static libraries... no
> checking for ANSI C header files... (cached) no
> checking fcntl.h usability... no
> checking fcntl.h presence... yes
> configure: WARNING: fcntl.h: present but cannot be compiled
> configure: WARNING: fcntl.h:     check for missing prerequisite headers?
> configure: WARNING: fcntl.h: see the Autoconf documentation
> configure: WARNING: fcntl.h:     section "Present But Cannot Be Compiled"
> configure: WARNING: fcntl.h: proceeding with the compiler's result
> configure: WARNING:     ## ---------------------------------------- ##
> configure: WARNING:     ## Report this to [email protected] ##
> configure: WARNING:     ## ---------------------------------------- ##
> checking for fcntl.h... no
> checking for inttypes.h... (cached) no
> checking limits.h usability... no
> checking limits.h presence... yes
> configure: WARNING: limits.h: present but cannot be compiled
> configure: WARNING: limits.h:     check for missing prerequisite headers?
> configure: WARNING: limits.h: see the Autoconf documentation
> configure: WARNING: limits.h:     section "Present But Cannot Be Compiled"
> configure: WARNING: limits.h: proceeding with the compiler's result
> configure: WARNING:     ## ---------------------------------------- ##
> configure: WARNING:     ## Report this to [email protected] ##
> configure: WARNING:     ## ---------------------------------------- ##
> checking for limits.h... no
> checking for stdlib.h... (cached) no
> checking for unistd.h... (cached) no
> checking for working memcmp... no
> checking for working strtod... no
> checking for pow... no
> checking for pow in -lm... no
> configure: WARNING: cannot find library containing definition of pow
> checking for ftruncate... no
> checking for memset... no
> checking for mkdir... no
> checking for strchr... no
> checking for strerror... no
> checking for strtol... no
> checking zlib version... headers missing or too old (requires 1.2.0.4)
> checking for the pthreads library -lpthreads... yes
> checking for joinable pthread attribute... PTHREAD_CREATE_JOINABLE
> checking if more special flags are required for pthreads... -D_THREAD_SAFE
> checking whether to check for GCC pthread/shared inconsistencies... no
> checking whether what we have so far is sufficient with -nostdlib... no
> checking whether -lpthread saves the day... no
> configure: WARNING: Impossible to determine how to use pthreads with 
> shared libraries and -nostdlib
> checking the location of hash_map... 
> configure: WARNING: could not find an STL hash_map
> checking for library containing sched_yield... no
> configure: error: in `/home/woijkd/tools/protobuf-3.0.0':
> configure: error: sched_yield was not found on your system
> See `config.log' for more details
> ```
>
>

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