not able to install ruby-opencv gem-Collection of common programming errors
Gagan
I am unable to install ruby-opencv gem.
Here’s what I have done so far.
Installed openCV with
sudo apt-get install libopencv-dev
Then tried installing ruby-opencv gem with
gem install ruby-opencv
But I got the following error
? test gem install ruby-opencv
Building native extensions. This could take a while...
ERROR: Error installing ruby-opencv:
ERROR: Failed to build gem native extension.
/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/bin/ruby extconf.rb
>> Check the required libraries...
checking for main() in -lopencv_calib3d... yes
checking for main() in -lopencv_contrib... yes
checking for main() in -lopencv_core... yes
checking for main() in -lopencv_features2d... yes
checking for main() in -lopencv_flann... yes
checking for main() in -lopencv_gpu... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/bin/ruby
--with-opencv-dir
--without-opencv-dir
--with-opencv-include
--without-opencv-include=${opencv-dir}/include
--with-opencv-lib
--without-opencv-lib=${opencv-dir}/lib
--with-libxml2-dir
--without-libxml2-dir
--with-libxml2-include
--without-libxml2-include=${libxml2-dir}/include
--with-libxml2-lib
--without-libxml2-lib=${libxml2-dir}/lib
--with-opencv_calib3dlib
--without-opencv_calib3dlib
--with-opencv_contriblib
--without-opencv_contriblib
--with-opencv_corelib
--without-opencv_corelib
--with-opencv_features2dlib
--without-opencv_features2dlib
--with-opencv_flannlib
--without-opencv_flannlib
--with-opencv_gpulib
--without-opencv_gpulib
extconf.rb:53:in `block in ': libopencv_gpu not found. (RuntimeError)
from extconf.rb:52:in `each'
from extconf.rb:52:in `'
It seems there is no libopencv-gpu dependency installed.
I tried to install it with apt-get but couldn’t succeed as no repository was found.
Can any one help me how to install ruby-opencv gem?
UPDATE added mkmf.log content
? test cat /home/ckgagan/.rvm/gems/ruby-1.9.3-p484/gems/ruby-opencv-0.0.11/ext/opencv/mkmf.log
have_library: checking for main() in -lopencv_calib3d... -------------------- yes
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lpthread -lrt -ldl -lcrypt -lm -lc"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5: return 0;
6: }
/* end */
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { main(); return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
--------------------
have_library: checking for main() in -lopencv_contrib... -------------------- yes
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { main(); return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
--------------------
have_library: checking for main() in -lopencv_core... -------------------- yes
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_contrib -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_core -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_contrib -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_core -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { main(); return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
--------------------
have_library: checking for main() in -lopencv_features2d... -------------------- yes
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_core -lopencv_contrib -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_core -lopencv_contrib -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { main(); return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
--------------------
have_library: checking for main() in -lopencv_flann... -------------------- yes
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { main(); return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
--------------------
have_library: checking for main() in -lopencv_gpu... -------------------- no
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_gpu -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fPIC conftest.c -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L. -rdynamic -Wl,-export-dynamic -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_gpu -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
/usr/bin/ld: cannot find -lopencv_gpu
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: int t() { main(); return 0; }
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: printf("%p", &t);
9: }
10:
11: return 0;
12: }
/* end */
--------------------
Thanks