Programming

Hi - I have two complex (for me at least) make files. The older one creates a succesful executable. The later one uses if statements to conditionally make different versions of the executable. The 2nd produces an executable that fails. I have "eyeballed" the differences in the Make files and run make -n to try and spot the differences but cannot find my mistake. Is there a Unix command that will give me a summary of the contents of the two executables ie what libraries are linked etc..
Thank you

Mike

try 'man nm'

Do you mean conditional compilation using preprocessor #if or makefile if statements.

Thanks gersh99.

Shamrock - at present Makefile ifeq and ifneq statements. Later I will be using preprocessor statements in my C++ code. But at present I just want to ensure I can reproduce the code as it stands. I'm linking a program that uses a third party API and there is a new version of the API. I need to be able to produce my executable for both the old and new versions of the api, hence the conditional makefile.

I set an environmental variable MYVERSN and then

ifeq ($(MYVERSN), 5000)
case new API detail
else
case B old API detail
endif

at various parts of the makefile

I know this mechanism is working by including echo statements in the target commands.

No, it's just in the detail of what include and library files and directories are used. I can't reduce that to a simple example and I wouldn't expect anyone else to plough through all the detail for me.

I was just hoping that there was some utility that would summaries the two executables so that I could spot the differences. I have looked at nm and concluded that this is probabably at too low level of detail to help me.

I think its back to manually inspecting the two make files. Ho hum!

You can list dynamic dependencies with ldd...it shows all the shared libs loaded by the executable at runtime. If the new version is not running then maybe there is something wrong with the new APIs. So what errors you are getting and can you post them.

I' confident that the API works because they supply example programs that I have compiled, linked and run

I ran ldd against the two executables
It listed 22 so's mainly in the same order. However the two that were not in the same order, although the left hand side and rhs text were identical the hex number at the end was different. Is that significant?

I'd make sure your 'LD_LIBRARY_PATH' env var are set the same for both makefile-s AND the shells you're running your executables in.