Bug#617751: Link using gcc
2011/10/20 Romain Beauxis <romain.beauxis@gmail.com>:
> Hi,
>
> After some investigations, it turns out that ocamlopt actually calls
> gcc at link time. Furthermore, g++ adds -lstdc++ to the command used
> to link.
>
> Compiling an example program with ocamlopt and ocaml-taglib (-lstdc++ added):
>
> 14:19 toots@selassie ~/savonet-hg/ocaml-taglib/examples% ocamlopt
> -verbose -cclib -v -I ../src unix.cmxa taglib.cmxa -o
> tagutil tagutil.cmx
> + as -o '/tmp/camlstartup15aa04.o' '/tmp/camlstartup6e0e5f.s'
> + gcc -o 'tagutil' '-L../src' '-L/usr/lib/ocaml'
> '/tmp/camlstartup15aa04.o' '/usr/lib/ocaml/std_exit.o' 'tagutil.o'
> '../src/taglib.a' '/usr/lib/ocaml/unix.a' '/usr/lib/ocaml/stdlib.a'
> '-ltaglib_stubs' '-ltag' '-lstdc++' '-lunix' '-v'
> '/usr/lib/ocaml/libasmrun.a' -lm -ldl
>
> Linking previous example using gcc and -lstdc++:
>
>
> 14:22 toots@selassie /tmp% gcc -v -lstdc++ foo.o -o foo
> Using built-in specs.
> Target: x86_64-linux-gnu
> Configured with: ../src/configure -v --with-pkgversion='Debian
> 4.4.5-8' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
> --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
> --program-suffix=-4.4 --enable-shared --enable-multiarch
> --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
> --without-included-gettext --enable-threads=posix
> --with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib
> --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
> --enable-objc-gc --with-arch-32=i586 --with-tune=generic
> --enable-checking=release --build=x86_64-linux-gnu
> --host=x86_64-linux-gnu --target=x86_64-linux-gnu
> Thread model: posix
> gcc version 4.4.5 (Debian 4.4.5-8)
> COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/
> LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../:/lib/:/usr/lib/
> COLLECT_GCC_OPTIONS='-v' '-o' 'foo' '-mtune=generic'
> /usr/lib/gcc/x86_64-linux-gnu/4.4.5/collect2 --build-id
> --eh-frame-hdr -m elf_x86_64 --hash-style=both -dynamic-linker
> /lib64/ld-linux-x86-64.so.2 -o foo
> /usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/crt1.o
> /usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/crti.o
> /usr/lib/gcc/x86_64-linux-gnu/4.4.5/crtbegin.o
> -L/usr/lib/gcc/x86_64-linux-gnu/4.4.5
> -L/usr/lib/gcc/x86_64-linux-gnu/4.4.5
> -L/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib -L/lib/../lib
> -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../..
> -lstdc++ foo.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc
> --as-needed -lgcc_s --no-as-needed
> /usr/lib/gcc/x86_64-linux-gnu/4.4.5/crtend.o
> /usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/crtn.o
>
> Same with g++:
Sorry:
14:25 toots@selassie /tmp% g++ -v foo.o -o foo
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian
4.4.5-8' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.4 --enable-shared --enable-multiarch
--enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib
--enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-objc-gc --with-arch-32=i586 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.5 (Debian 4.4.5-8)
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-o' 'foo' '-shared-libgcc' '-mtune=generic'
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/collect2 --build-id
--eh-frame-hdr -m elf_x86_64 --hash-style=both -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -o foo
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.4.5
-L/usr/lib/gcc/x86_64-linux-gnu/4.4.5
-L/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib -L/lib/../lib
-L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../.. foo.o
-lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/crtn.o
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