[Scons-users] How do I specify special link options?

[Evan Driscoll]

If you want GCC to pass an object to the linker, you use -Wl. So try 
adding '-Wl,--unresolved-symbols=ignore-in-object-files' to LINKFLAGS. 
(',' in a -Wl flag is translated to a space, so you could also probably 
say '-Wl,--unresolved-symbols,ignore-in-object-files'. The usual place 
I've seen this used is when specifying --rpath, but SCons provides a way 
to do that directly.)

Evan



On 08/14/2012 01:27 PM, Peter Steele wrote:

> I am working with a shared library for which I know there will be

> unresolved externals when I link it with an application. I tried to

> create a SConstruct file for my app and include the option

>

> --unresolved-symbols=ignore-in-object-files

>

> for the linker. I could not get it to work right though. My first

> attempt was to do this:

>

> env = Environment(CCFLAGS = ['--unresolved-symbols=ignore-in-object-files'])

>

> but this link option gets interpreted by gcc as an invalid option when

> specified in this manner. I instead tried

>

> env = Environment(LINKFLAGS =

> ['--unresolved-symbols=ignore-in-object-files'])

>

> but this did not solve the problem either. After some research I tried

> this approach:

>

> env = Environment(LINK = ['/usr/bin/ld'], LINKFLAGS =

> ['--unresolved-symbols=ignore-in-object-files'])

>

> which forces Scons to use ld intead of gcc for the link command. This

> solved the problem—the link option was finally accepted as valid—but the

> link ended up failing with

>

> /usr/bin/ld: warning: cannot find entry symbol _start; defaulting to

> 00000000004002d0

>

> I did some research on this message and discovered it was related to a

> missing symbol that’s normally defined in /usr/lib/crt1.o that doesn’t

> get included when ld is used for linking instead of gcc.

>

> My impression is that this is getting way too complicated for what I

> need to do. Am I missing something obvious? How can I get this link

> option to work without hacking up my SConstruct file.

>

> Peter

>

>

>

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