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correct check for -rdynamic

From: Dan McMahill
Subject: correct check for -rdynamic
Date: Wed, 18 Oct 2006 01:45:04 -0400
User-agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.7.6) Gecko/20050412

Anyone have a correct check to see if the compiler needs/accepts -rdynamic or maybe -Wl,--export-dynamic?

We were using a test like:

AC_MSG_CHECKING([If the compiler accepts -rdynamic])
LDFLAGS="$LDFLAGS -rdynamic"
AC_LINK_IFELSE([int main(){}],

unfortunately, while this seems to work with gcc, it does not work with SunPRO. Here are some examples of how this test might play out.

> cc -rdynamic -o foo foo.c
cc: Warning: illegal option -dynamic
> echo $?

so configure thinks rdynamic is ok however, foo is not ok:

> file foo
foo: ELF 32-bit MSB relocatable SPARC32PLUS Version 1, V8+ Required
> ls -l foo
-rw-r--r--   1 yyyyy yyyyy     429116 Oct 16 22:12 foo

note that foo is not an executible, it is a relocatable.

Without  -rdynamic, things are ok:

> cc  -o foo foo.c
> file foo
foo: ELF 32-bit MSB executable SPARC32PLUS Version 1, V8+ Required, dynamically linked, not stripped
> ls -l foo
-rwxr-xr-x   1 yyyyy yyyyy       6984 Oct 16 22:12 foo

> cc -V
cc: Sun C 5.8 2005/10/13
usage: cc [ options] files.  Use 'cc -flags' for details

I actually don't think you need any sort of -rdynamic or -Wl,--export-dynamic with SunPRO, but I really don't know about some of the other compilers out there (MipsPRO for example).



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