Re: [Valgrind-developers] Why -Wl, -z, interpose, -z, initfirst for valgrind on Linux?

[Ivo R. <iv...@iv...>]

2017-09-22 7:24 GMT+02:00 John Reiser <jr...@bi...>:
> What is the purpose of the bits DF_1_INTERPOSE and DF_1_INITFIRST that are
> set in
> the DT_FLAGS_1 word of the Dynamic section of files
>         $PREFIX/lib/valgrind/vgpreload_$TOOL-$ARCH-linux.so
> for which the ultimate source is:
>     $ grep -e -z, Makefile*
>     Makefile.all.am:PRELOAD_LDFLAGS_COMMON_LINUX  = -nodefaultlibs -shared
> -Wl,-z,interpose,-z,initfirst
>     Makefile.all.am:PRELOAD_LDFLAGS_COMMON_SOLARIS = -nodefaultlibs -shared
> -Wl,-z,interpose,-z,initfirst
>     Makefile.tool.am:TOOL_LDFLAGS_ARM_LINUX += -Wl,-z,noexecstack
>
> Which particular symbols are those flags designed to affect?


I can only add that Solaris followed Linux lead here.
I tried to remove the -z flags on Solaris and did not observe problems...

I.