RE: Help for GCC newbie

RE: Help for GCC newbie

[Rupert Wood]

Mark Grimshaw wrote:	

> I compile my program using:
> g++ -W -pedantic -o test.o test.cpp  (this works ok)
> g++ -o test.exe test.o
: 
> test.o: In function `main':
> /home/mark/C++programming/test.cpp:14: multiple definition of 
> `__dso_handle'

You're actually generating an executable in the first step and not an
object file. (The error occurs because you're then attempting to re-link
the executable with all the standard libraries.) You probably want to
add '-c' to the first command line to compile without linking.

As a side note, you probably also want to add either '-g' to both steps
to include debugging information in the executable, or add '-O2' to the
first to build an optimised release.

Hope that helps,
Rup.

RE: Help for GCC newbie

[Andrea 'Fyre Wyzard' Bocci]

At 08.40 01/05/2002 (GMT +0100), Rupert Wood wrote:

>As a side note, you probably also want to add either '-g' to both steps
>to include debugging information in the executable, or add '-O2' to the
>first to build an optimised release.

Of both (-g -O2). gcc support debugging info when optimisig, so you can 
actually see how the optimised code runs.

fw

Help for GCC newbie

[mark grimshaw]

Hello,

I have been trying to get GCC 3.0.4 which i downloaded and built to build 
even the simplest 'Hello World' programs.  I get the following  linker 
errors after a simple 'Hello World' has been compiled and similar errors 
when trying to build a C program (albeit the C runtime libraries are 
mentioned instead) - can anyone help me.  Thanks.

I compile my program using:
g++ -W -pedantic -o test.o test.cpp  (this works ok)
g++ -o test.exe test.o

test.o: In function `main':
/home/mark/C++programming/test.cpp:14: multiple definition of `__dso_handle'
/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.0.4/crtbegin.o(.data+0x0): first 
defined here
test.o: In function `_init':
test.o(.init+0x0): multiple definition of `_init'
/usr/lib/crti.o(.init+0x0): first defined here
test.o: In function `_start':
test.o(.text+0x0): multiple definition of `_start'
/usr/lib/crt1.o(.text+0x0): first defined here
test.o: In function `main':
/home/mark/C++programming/test.cpp:14: multiple definition of `_fini'
/usr/lib/crti.o(.fini+0x0): first defined here
test.o: In function `main':
/home/mark/C++programming/test.cpp:14: multiple definition of 
`_GLOBAL_OFFSET_TABLE_'
/usr/lib/crti.o(.got.plt+0x0): first defined here
test.o: In function `main':
/home/mark/C++programming/test.cpp:14: multiple definition of 
`_IO_stdin_used'
/usr/lib/crt1.o(.rodata+0x4): first defined here
test.o: In function `main':
/home/mark/C++programming/test.cpp:14: multiple definition of `__data_start'
/usr/lib/crt1.o(.data+0x0): first defined here
/usr/lib/crti.o(.dynamic+0x0): multiple definition of `_DYNAMIC'
collect2: ld returned 1 exit status
make: *** [build] Error 1



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