Where are the original commands defined?

[Peng Yu]

Hi,

I got the following int config.log when I run
http://git.savannah.gnu.org/cgit/bash.git/tree/configure

configure:3772: gcc -g -finstrument-functions
-L/root/linux/bin/wrappercomposite/src/xplat/llvmxplat/src/mkvar/bin/Linux
conftest.c -ltrace >&5
/usr/bin/ld: 
/root/linux/bin/wrappercomposite/src/xplat/llvmxplat/src/mkvar/bin/Linux/libtrace.a(trace.o):
relocation R_X86_64_32S against `.bss' can not be used when making a
PIE object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output

configure also runs many other commands. How to figure out where the
original commands are defined? Thanks.

...
checking whether char is unsigned... no
checking for working volatile... yes
checking for C/C++ restrict keyword... __restrict
checking whether NLS is requested... yes
checking for msgfmt... no
checking for gmsgfmt... :
checking for xgettext... no
checking for msgmerge... no
checking for off_t... yes
checking for size_t... yes
checking for working alloca.h... yes
checking for alloca... yes
checking for stdlib.h... (cached) yes
checking for unistd.h... (cached) yes
checking for sys/param.h... yes
checking for sys/time.h... yes
checking for getpagesize... yes
checking for working mmap... yes
checking whether we are using the GNU C Library 2.1 or newer... yes
checking whether integer division by zero raises SIGFPE... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unsigned long long... yes
checking for inttypes.h... yes
checking whether the inttypes.h PRIxNN macros are broken... no
checking for ld used by GCC... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for shared library run path origin... done
checking argz.h usability... yes
checking argz.h presence... yes
checking for argz.h... yes
checking limits.h usability... yes
checking limits.h presence... yes
checking for limits.h... yes
checking locale.h usability... yes
checking locale.h presence... yes
checking for locale.h... yes
checking nl_types.h usability... yes
checking nl_types.h presence... yes
checking for nl_types.h... yes
checking malloc.h usability... yes
checking malloc.h presence... yes
checking for malloc.h... yes
checking stddef.h usability... yes
checking stddef.h presence... yes
checking for stddef.h... yes
checking for stdlib.h... (cached) yes
checking for string.h... (cached) yes
checking for unistd.h... (cached) yes
checking for sys/param.h... (cached) yes
checking for feof_unlocked... yes
checking for fgets_unlocked... yes
checking for getc_unlocked... yes
...

-- 
Regards,
Peng