compiling tests/Embedding

In addition to the compiler issues, the test should also be changed.
It should use R_tryEval() directly rather than Test_tryEval().  The 
test preceeds the existence
of that exported routine that was motivated by the same
usage that gave rise to this test.

I'll commit an update when I get a few minutes.

 D.

Prof Brian Ripley wrote:

What system is this?

It should work under gcc-3.3.4, as the issue is visibility attributes 
and they are not supposed to be supported on that compiler.  (I 
suspect from the message that this is not a version of gcc released 
by GNU, a common source of problems.)  I happen to have an i686 FC3 
system with a gcc 3.3.5 compiled from the GNU sources (to help track 
down a bug in code generated by that compiler), and that does work in 
tests/Embedding.

In src/main/context.c you will find

context.c:Rboolean attribute_hidden R_ToplevelExec(void (*fun)(void 
*), void *data)

and you need to remove 'attribute_hidden' and recompile.

(There is a known problem here with gcc >= 4.0.0, with this fix in 
the pre-2.3.1 sources.  We know that certain RedHat systems have 
gcc3's that support visibility, not always completely.)


On Thu, 25 May 2006, George Ostrouchov wrote:

I am compiling the Embedding examples in the tests directory and get an
undefined reference. I include the make output as well as grep'd output
of nm on libR.so and compiler and arch information. Do I have an
improperly built R shared library or is there a problem with the
Embedding tests or something else I am not seeing?

Thanks for any help!
George


ost at hawk0:/data5/ost/R/R-2.3.0/tests/Embedding> make
../../bin/R CMD LINK gcc -o Rtest Rtest.o embeddedRCall.o -L`cd 
../.. &&
/bin/pwd`/lib -lR
gcc -o Rtest Rtest.o embeddedRCall.o
-L/autofs/tewa_data5/ost/R/R-2.3.0/lib -lR -Wl,--rpath
-Wl,/data5/ost/R/R-2.3.0/lib
embeddedRCall.o(.text+0x1e): In function `Test_tryEval':
/autofs/tewa_data5/ost/R/R-2.3.0/tests/Embedding/embeddedRCall.c:81:
undefined reference to `R_ToplevelExec'
collect2: ld returned 1 exit status
make: *** [Rtest] Error 1
ost at hawk0:/data5/ost/R/R-2.3.0/tests/Embedding> cd
/autofs/tewa_data5/ost/R/R-2.3.0/lib
ost at hawk0:/autofs/tewa_data5/ost/R/R-2.3.0/lib> nm libR.so | grep R_Top
000000000042c920 B R_Toplevel
000000000042cae8 B R_ToplevelContext
000000000007a7b0 t R_ToplevelExec
ost at hawk0:/autofs/tewa_data5/ost/R/R-2.3.0/lib> gcc --version
gcc (GCC) 3.3.4 (pre 3.3.5 20040809)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There 
is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR 
PURPOSE.

ost at hawk0:/autofs/tewa_data5/ost/R/R-2.3.0/lib> arch
x86_64
ost at hawk0:/autofs/tewa_data5/ost/R/R-2.3.0/lib>