Following along with the POSIXification of 2007, I noticed that ldd is
a bash script and will fail silently for non-bash /bin/sh.
[12:25 PM [EMAIL PROTECTED] bash /usr/bin/ldd /lib/libc.so.6
/lib/ld-linux.so.2 (0xb7f2b000)
linux-gate.so.1 => (0xb7f2a000)
[12:25 PM [EMAIL PROTECTED] dash /usr/bin/ldd /lib/libc.so.6
[12:26 PM [EMAIL PROTECTED] echo $?
2
The Glibc Makefile tries to be smart and substitutes in the value for
$(BASH) in elf/ldd.in. The value for BASH is figured out in configure
using the standard autoconf macro AC_PATH_PROG. It will do a PATH
search for bash unless the variable $BASH is set in the environment,
indicating that the user wants to override the location.
When we run ./configure in Ch. 6, /bin/sh is executed, which is a link
to bash. This sets BASH=/bin/sh in the environment, so that gets
recorded by AC_PATH_PROG and subsequently substituted in /usr/bin/ldd
for the shebang (run head -n1 /usr/bin/ldd). You can see this happen
if /bin/sh -> bash on your system:
$ /bin/sh -c "declare -p BASH"
declare -- BASH="/bin/sh"
$ /bin/bash -c "declare -p BASH"
declare -- BASH="/bin/bash"
This isn't a problem if /bin/sh -> bash always. But if you later
install a new sh, ldd will bomb. So, I'm proposing that we force
/bin/bash as the shebang for ldd. Two possible ways are:
1. Prior to configure and changing dirs - sed -i 's|@BASH@|/bin/bash|'
elf/ldd.in
2. Just override the var during make - make BASH=/bin/bash
What do you guys think?
--
Dan
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