R help - Mar 2007 - changes in behaviour of Rcmd SHLIB since 2.4.0

Dear all,

I have some C code using the zlib uncompress. It compiles fine under Win XP
(with SP2) with R up to 2.3.1 and generates four files (Makedeps, *.d,
*.dll, and *.o):

C:\Data\R-packages\cmg>rcmd SHLIB cmg.c -o cmg.dll
latex: not found
making cmg.d from cmg.c
gcc   -IC:/PROGRA~1/R/R-2.3.1/include -Wall -O2   -c cmg.c -o cmg.o
cmg.c: In function `readcmg':
cmg.c:33: warning: assignment from incompatible pointer type
cmg.c:40: warning: assignment from incompatible pointer type
cmg.c:50: warning: assignment from incompatible pointer type
gcc  -shared -s  -o cmg.dll cmg.def cmg.o  -LC:/PROGRA~1/R/R-2.3.1/bin
-lR

With R 2.4.0 and later, the compilation fails at the linking, so the four
files generated are Makedeps, *.d, *.def, and *.o:

C:\Data\R-packages\cmg>rcmd SHLIB cmg.c -o cmg.dll
latex: not found
making cmg.d from cmg.c
gcc   -IC:/PROGRA~1/R/R-2.4.1/include  -Wall -O2 -std=gnu99   -c cmg.c -o
cmg.o
cmg.c: In function `readcmg':
cmg.c:33: warning: assignment from incompatible pointer type
cmg.c:40: warning: assignment from incompatible pointer type
cmg.c:50: warning: assignment from incompatible pointer type
gcc  -shared -s  -o cmg.dll cmg.def cmg.o  -LC:/PROGRA~1/R/R-2.4.1/bin
-lR
cmg.o:cmg.c:(.text+0xc0): undefined reference to `uncompress'
collect2: ld returned 1 exit status
make: *** [cmg.dll] Error 1

I have seen the page by Duncan Murdoch
(http://www.murdoch-sutherland.com/Rtools/), that since 2.4.0 you need
MinGW runtime 3.11 or higher, so I reinstalled the whole MinGW (runtime now
3.11, gcc core and C++ compiler now 3.4.5) and ActivePerl (now 5.8.8. build
820) but the problem persists.

Any ideas or hints on how I could compile my C code with the current
version of R are highly welcome.

Many thanks in advance and best regards, Jan



DISCLAIMER: This e-mail contains information solely intended...{{dropped}}

Since R-2.4.0 less symbols are exported from R.dll.

Uwe Ligges


Jan.Kleinn at partnerre.com wrote:
> Dear all,
> 
> I have some C code using the zlib uncompress. It compiles fine under Win XP
> (with SP2) with R up to 2.3.1 and generates four files (Makedeps, *.d,
> *.dll, and *.o):
> 
> C:\Data\R-packages\cmg>rcmd SHLIB cmg.c -o cmg.dll
> latex: not found
> making cmg.d from cmg.c
> gcc   -IC:/PROGRA~1/R/R-2.3.1/include -Wall -O2   -c cmg.c -o cmg.o
> cmg.c: In function `readcmg':
> cmg.c:33: warning: assignment from incompatible pointer type
> cmg.c:40: warning: assignment from incompatible pointer type
> cmg.c:50: warning: assignment from incompatible pointer type
> gcc  -shared -s  -o cmg.dll cmg.def cmg.o  -LC:/PROGRA~1/R/R-2.3.1/bin
> -lR
> 
> With R 2.4.0 and later, the compilation fails at the linking, so the four
> files generated are Makedeps, *.d, *.def, and *.o:
> 
> C:\Data\R-packages\cmg>rcmd SHLIB cmg.c -o cmg.dll
> latex: not found
> making cmg.d from cmg.c
> gcc   -IC:/PROGRA~1/R/R-2.4.1/include  -Wall -O2 -std=gnu99   -c cmg.c -o
> cmg.o
> cmg.c: In function `readcmg':
> cmg.c:33: warning: assignment from incompatible pointer type
> cmg.c:40: warning: assignment from incompatible pointer type
> cmg.c:50: warning: assignment from incompatible pointer type
> gcc  -shared -s  -o cmg.dll cmg.def cmg.o  -LC:/PROGRA~1/R/R-2.4.1/bin
> -lR
> cmg.o:cmg.c:(.text+0xc0): undefined reference to `uncompress'
> collect2: ld returned 1 exit status
> make: *** [cmg.dll] Error 1
> 
> I have seen the page by Duncan Murdoch
> (http://www.murdoch-sutherland.com/Rtools/), that since 2.4.0 you need
> MinGW runtime 3.11 or higher, so I reinstalled the whole MinGW (runtime now
> 3.11, gcc core and C++ compiler now 3.4.5) and ActivePerl (now 5.8.8. build
> 820) but the problem persists.
> 
> Any ideas or hints on how I could compile my C code with the current
> version of R are highly welcome.
> 
> Many thanks in advance and best regards, Jan
> 
> 
> 
> DISCLAIMER: This e-mail contains information solely intended...{{dropped}}
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

On Wed, 28 Mar 2007, Jan.Kleinn at partnerre.com wrote:
>
> Dear all,
>
> I have some C code using the zlib uncompress. It compiles fine under Win XP
> (with SP2) with R up to 2.3.1 and generates four files (Makedeps, *.d,
> *.dll, and *.o):
No one every said that zlib interface would be exported from R, and as 
from R 2.4.0 it is not on those platforms where exports can be controlled.
`Wrting R Extensions' has always warned you about making use of entry 
points not in the API, so this should have come as no surprise to you, and 
CHANGES for 2.4.0 said

   Entry points which are hidden in libR.so on Unix are now also hidden
   in R.dll.  (Just over half the entry points are hidden, which speeds up
   loading.)

Please use the appropriate list for programming questions (as documented 
in the R posting guide).

> C:\Data\R-packages\cmg>rcmd SHLIB cmg.c -o cmg.dll
> latex: not found
> making cmg.d from cmg.c
> gcc   -IC:/PROGRA~1/R/R-2.3.1/include -Wall -O2   -c cmg.c -o cmg.o
> cmg.c: In function `readcmg':
> cmg.c:33: warning: assignment from incompatible pointer type
> cmg.c:40: warning: assignment from incompatible pointer type
> cmg.c:50: warning: assignment from incompatible pointer type
> gcc  -shared -s  -o cmg.dll cmg.def cmg.o  -LC:/PROGRA~1/R/R-2.3.1/bin
> -lR
>
> With R 2.4.0 and later, the compilation fails at the linking, so the four
> files generated are Makedeps, *.d, *.def, and *.o:
>
> C:\Data\R-packages\cmg>rcmd SHLIB cmg.c -o cmg.dll
> latex: not found
> making cmg.d from cmg.c
> gcc   -IC:/PROGRA~1/R/R-2.4.1/include  -Wall -O2 -std=gnu99   -c cmg.c -o
> cmg.o
> cmg.c: In function `readcmg':
> cmg.c:33: warning: assignment from incompatible pointer type
> cmg.c:40: warning: assignment from incompatible pointer type
> cmg.c:50: warning: assignment from incompatible pointer type
> gcc  -shared -s  -o cmg.dll cmg.def cmg.o  -LC:/PROGRA~1/R/R-2.4.1/bin
> -lR
> cmg.o:cmg.c:(.text+0xc0): undefined reference to `uncompress'
> collect2: ld returned 1 exit status
> make: *** [cmg.dll] Error 1
>
> I have seen the page by Duncan Murdoch
> (http://www.murdoch-sutherland.com/Rtools/), that since 2.4.0 you need
> MinGW runtime 3.11 or higher, so I reinstalled the whole MinGW (runtime now
> 3.11, gcc core and C++ compiler now 3.4.5) and ActivePerl (now 5.8.8. build
> 820) but the problem persists.
>
> Any ideas or hints on how I could compile my C code with the current
> version of R are highly welcome.
>
> Many thanks in advance and best regards, Jan
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595