[gambit-list] Building loadable library

Kartik Saranathan ksaranat at gmail.com
Fri May 13 19:42:06 EDT 2011


 Hi Marc.  Thanks for the pointer to gambc-cc.  I've passed the
 necessary arguments to make the o1 file now but I get a segmentation
 fault on the first ___make_pair in fileio_util.cpp.  I've tried
 searching through past messages on the maling list but couldn't find
 anything that helped (there were posts about a GLUT FFI that can be
 built as a loadable library but I couldn't find any code).  Here are
 the relevant pieces of my code.

 fileio.scm:
 (define test (c-lambda () scheme-object "test"))
 (pretty-print (test))

 fileio_util.cpp:
 #include "gambit.h"
 ___SCMOBJ test()
 {
    return ___EXT(___make_pair)(___FIX(1), ___FIX(2), ___STILL);
    // return ___FIX(1);
 }

 fileio_util.h:
 ___SCMOBJ test();

 Here is how I compile it.  I pass in $(FLAGS_DYN) $(DEFS_DYN) to the
 compiler as you suggested.  I pass -x c++ to make sure fileio.c
 compiles as a c++ file.

 ---
 gsc -link -flat -o search.o1.c fileio
 g++ -bundle -no-cpp-precomp -Wno-unused -O1 -fno-math-errno
 -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing -fwrapv
 -fomit-frame-pointer -fno-move-loop-invariants -fPIC -fno-common
 -mieee-fp -flat_namespace -undefined suppress -D___SINGLE_HOST
 -D___DYNAMIC -I"/usr/local/Gambit-C/include" -x c++ fileio_util.cpp
 fileio.c sqlite3.o search.o1.c -o search.o1
 ----

 Here is what happens when I run it

 ---
 bash-3.2$ gdb gsi
 (gdb) r
 Starting program: /usr/local/bin/gsi
 Reading symbols for shared libraries ++. done
 Gambit v4.6.1

> (load "search")
 Reading symbols for shared libraries . done

 Program received signal EXC_BAD_ACCESS, Could not access memory.
 Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000818
 0x0000000100702112 in test ()
 ---

 It is probably crashing in ___alloc_scmobj but I can't see why.  The
 program prints '(1 . 2)' when compiled as an executable.  I built
 gambit from source with g++ under mac osx.

 As for the extension for source files Matthew gave a good list.

 Thanks

 On Thu, May 12, 2011 at 5:56 AM, Marc Feeley <feeley at iro.umontreal.ca> wrote:
>
> On 2011-05-12, at 1:39 AM, Kartik Saranathan wrote:
>
>> I have the following setup
>>
>> fileio.scm - contains c-lambda forms to bind C functions in fileio_util.cpp
>> fileio_util.cpp - contains code that uses functions from gambit
>> runtime library (data conversion functions like
>> ___UTF_8STRING_to_SCMOBJ)
>>
>> I'd like to make a loadable library from the above.  Here is what I tried
>>
>>  bash-3.2$ uname -srmp
>>  Darwin 10.7.0 i386 i386
>>  gsc -link -flat -o search.o1.c fileio
>>  g++    -no-cpp-precomp -Wno-unused -O1 -fno-math-errno
>> -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing -fwrapv
>> -fomit-frame-pointer -fno-move-loop-invariants -fPIC -fno-common
>> -mieee-fp   -D___SINGLE_HOST  -I"/usr/local/Gambit-C/include" -c -o
>> "fileio_util.o" -D___DYNAMIC fileio_util.cpp
>>  g++    -no-cpp-precomp -Wno-unused -O1 -fno-math-errno
>> -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing -fwrapv
>> -fomit-frame-pointer -fno-move-loop-invariants -fPIC -fno-common
>> -mieee-fp   -D___SINGLE_HOST  -I"/usr/local/Gambit-C/include" -c -o
>> "search.o1.o" -D___DYNAMIC search.o1.c
>>  g++    -no-cpp-precomp -Wno-unused -O1 -fno-math-errno
>> -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing -fwrapv
>> -fomit-frame-pointer -fno-move-loop-invariants -fPIC -fno-common
>> -mieee-fp   -D___SINGLE_HOST  -I"/usr/local/Gambit-C/include" -c -o
>> "fileio.o" -D___DYNAMIC fileio.c
>>  g++ -bundle fileio_util.o fileio.o sqlite3.o search.o1.o -o search.o1
>>
>> Linker gives the following errors
>>
>>  Undefined symbols:
>>    "___S64_to_SCMOBJ(long, long*, int)", referenced from:
>>        ConvertSqliteData(sqlite3_stmt*, int, int, long&)in fileio_util.o
>>    "___UTF_8STRING_to_SCMOBJ(char*, long*, int)", referenced from:
>>        ConvertSqliteData(sqlite3_stmt*, int, int, long&)in fileio_util.o
>>        w_sqlite_prepare(sqlite3*, char*)in fileio_util.o
>>    "___F64_to_SCMOBJ(double, long*, int)", referenced from:
>>        ConvertSqliteData(sqlite3_stmt*, int, int, long&)in fileio_util.o
>>
>> Since libgambc.a defines those symbols I tried liking with it.  Here
>> is what I get.
>>
>>  Undefined symbols:
>>    "_environ", referenced from:
>>        ___unsetenv_UCS_2(unsigned short*)in libgambc.a(os_shell.o)
>>        ___cleanup_shell_module()     in libgambc.a(os_shell.o)
>>        ___os_environ()     in libgambc.a(os_shell.o)
>>        ___setenv_UCS_2(unsigned short*, unsigned short*)in
>> libgambc.a(os_shell.o)
>>        ___setenv_UCS_2(unsigned short*, unsigned short*)in
>> libgambc.a(os_shell.o)
>>        ___getenv_UCS_2(unsigned short*, unsigned short**)in
>> libgambc.a(os_shell.o)
>>        ___device_stream_setup_from_process(___device_stream_struct**,
>> ___device_group_struct*, char**, char**, char*, int)in
>> libgambc.a(os_io.o)
>>       (maybe you meant:
>> ____G__23__23_fail_2d_check_2d_unbound_2d_os_2d_environment_2d_variable_2d_exception,
>> ____G__23__23_display_2d_dynamic_2d_environment_3f_ , ... )
>
> My guess is that some C linker options are missing to generate a dynamically loadable library.  From the file bin/gambc-cc I see that, on a Mac, the build command for a dynamically loadable object file is:
>
> ${C_COMPILER} ${FLAGS_DYN} ${DEFS_DYN} -I"${GAMBCDIR_INCLUDE}" -o "${BUILD_DYN_OUTPUT_FILENAME}" ${BUILD_DYN_CC_OPTIONS} ${BUILD_DYN_LD_OPTIONS_PRELUDE} ${BUILD_DYN_INPUT_FILENAMES} ${BUILD_DYN_LD_OPTIONS}
>
> and
>
> FLAGS_DYN="-mmacosx-version-min=10.5 -Wl,-syslibroot,/Developer/SDKs/MacOSX10.6.sdk -arch x86_64 -m64 -isysroot /Developer/SDKs/MacOSX10.6.sdk -arch x86_64 -m64  -bundle  -no-cpp-precomp -Wno-unused -O1 -fno-math-errno -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing -fwrapv -fomit-frame-pointer -fno-move-loop-invariants -fPIC -fno-common -mieee-fp   -flat_namespace -undefined suppress"
>
> You can print that information with commands like:
>
> % gsi -e '(current-directory "~~bin")(shell-command "./gambc-cc BUILD_DYN")'
> % gsi -e '(current-directory "~~bin")(shell-command "./gambc-cc C_COMPILER")'
> % gsi -e '(current-directory "~~bin")(shell-command "./gambc-cc FLAGS_DYN")'
>
> so in your makefile you could have something like:
>
> BUILD_DYN=`gsi -e '(current-directory "~~bin")(shell-command "./gambc-cc BUILD_DYN")'`
> C_COMPILER=`gsi -e '(current-directory "~~bin")(shell-command "./gambc-cc C_COMPILER")'`
> FLAGS_DYN=`gsi -e '(current-directory "~~bin")(shell-command "./gambc-cc FLAGS_DYN")'`
> ...
> BUILD_DYN_INPUT_FILENAMES=fileio_util.o fileio.o sqlite3.o search.o1.o
> BUILD_DYN_OUTPUT_FILENAME=search.o1
>
> build_lib:
>        ${C_COMPILER} ${FLAGS_DYN} ${DEFS_DYN} -I"${GAMBCDIR_INCLUDE}" -o "${BUILD_DYN_OUTPUT_FILENAME}" ${BUILD_DYN_CC_OPTIONS} ${BUILD_DYN_LD_OPTIONS_PRELUDE} ${BUILD_DYN_INPUT_FILENAMES} ${BUILD_DYN_LD_OPTIONS}
>
> I haven't tested this so YMMV.
>
>> Also at first tried using gsc to run the compiler for me
>>
>>  gsc -verbose -cc-options "-D___DYNAMIC" -obj fileio.c
>> fileio_util.cpp search.o1.c
>>
>> But I kept getting
>>
>>  *** ERROR IN "fileio_util.cpp"@1.1 -- Invalid token
>>
>> I realized it was treating the .cpp file as a scheme file and failing.
>> Is this a bug or am I using it incorrectly?
>
> The command-line processing of gsc treats files with a ".c" extension as C source files and other extensions as Scheme files.  This is probably too conservative.  I could add ".cpp" and ".cc" and ".m" as alternatives for C source files.  Any others I should add?
>
>> How do I compile the
>> above as a loadable library?
>>
>> Thank you for Gambit.  The more I use it the more I like it.
>
> No problem!  Thanks!
>
> Marc
>
>



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