Compiling Library Into Program.

Shogun · 11-29-2004, 06:54 AM

Hi,
I have some memory of you being able to link a library statically if you want to make sure that the program runs on other computers, even if they do not have the library they use installed.

I have searched google, the forums and the gcc website, but I can't find out how this is done, so I'm simply asking: if this is possible and if it is how you do it?

**Salem** · 11-29-2004, 06:58 AM

Read the manual on the linker (ld)
Read about the "-static" linker option

Shogun · 11-29-2004, 07:14 AM

so I should for example use:

Code:

ld -llib -static  -o test.o

?

**Salem** · 11-29-2004, 07:37 AM

The manual page suggests that -static should be earlier on the command line

Shogun · 11-29-2004, 07:43 AM

so

Code:

ld -static -o test.o -llib

?

so the "-llib" is in the [file....] in the:

Code:

ld [ option ...	] [ file ...  ]

?

chrismiceli · 11-29-2004, 09:30 AM

You are right, but why don't use just link allowing gcc to pass the linker the options, such as this

Code:

gcc -static test.c -o test -lblah

But both work. Read this chapter of advanced linux programming to see how they both work:
http://www.advancedlinuxprogramming....x-software.pdf

Shogun · 11-30-2004, 07:41 AM

When I try this I get the following:

Code:

ld: can't locate file for: -lcrt0.o

I have now made a sarch for "crt" and I found crt1.o and crt2.o but no crt0.o, is this important and how do I fix it?

chrismiceli · 11-30-2004, 09:21 AM

Take off the .o in the -l part, like this

Code:

gcc -o file file.c -lblah
/*not*/
gcc -o file file.c -lblah.o

Also make sure the library is in the current directory or a system one for libraries, if not, you have to use the -L option to gcc.

Shogun · 11-30-2004, 09:24 AM

I don't have the .o in the library, I'm not even calling it,no clue where it came from, I search my SDK when I saw the message and I don't have that very library but I have crt1 and crt2...

Shogun · 11-30-2004, 01:21 PM

I made some more searching and I found the following:
guess I can't link stuff statically.. I wounder if there is any other way to do it, I'll have to do some more lookin around...

**Salem** · 11-30-2004, 01:29 PM

Driving the linker directly sucks, there is too much to get right.
If you really want to know, just compile a small program with the -v option, and see how complex a linker command line can be.

This works just fine here

Code:

$ gcc generic.c && ls -l a.out && file a.out
-rwxrwxr-x         11586 Nov 30 19:28 a.out
a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
$ gcc generic.c -static && ls -l a.out && file a.out
-rwxrwxr-x        447193 Nov 30 19:28 a.out
a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, not stripped

Obvious to tell that it's statically linked by the sudden jump in the size of the program executable.

11-29-2004, 06:54 AM	#1
Shogun Wannabe Coding God Join Date: Mar 2003 Posts: 259	Compiling Library Into Program. Hi, I have some memory of you being able to link a library statically if you want to make sure that the program runs on other computers, even if they do not have the library they use installed. I have searched google, the forums and the gcc website, but I can't find out how this is done, so I'm simply asking: if this is possible and if it is how you do it? __________________ They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.
Shogun is offline

11-29-2004, 06:58 AM	#2
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,630	Read the manual on the linker (ld) Read about the "-static" linker option
Salem is offline

11-29-2004, 07:14 AM	#3
Shogun Wannabe Coding God Join Date: Mar 2003 Posts: 259	so I should for example use: Code: ld -llib -static -o test.o ? __________________ They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.
Shogun is offline

11-29-2004, 07:37 AM	#4
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,630	The manual page suggests that -static should be earlier on the command line
Salem is offline

11-29-2004, 07:43 AM	#5
Shogun Wannabe Coding God Join Date: Mar 2003 Posts: 259	so Code: ld -static -o test.o -llib ? so the "-llib" is in the [file....] in the: Code: ld [ option ... ] [ file ... ] ? __________________ They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.
Shogun is offline

11-29-2004, 09:30 AM	#6
chrismiceli Obsessed with C Join Date: Jan 2003 Posts: 501	You are right, but why don't use just link allowing gcc to pass the linker the options, such as this Code: gcc -static test.c -o test -lblah But both work. Read this chapter of advanced linux programming to see how they both work: http://www.advancedlinuxprogramming....x-software.pdf __________________ Help populate a c/c++ help irc channel server: irc://irc.efnet.net channel: #c
chrismiceli is offline

11-30-2004, 07:41 AM	#7
Shogun Wannabe Coding God Join Date: Mar 2003 Posts: 259	When I try this I get the following: Code: ld: can't locate file for: -lcrt0.o I have now made a sarch for "crt" and I found crt1.o and crt2.o but no crt0.o, is this important and how do I fix it? __________________ They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows. Last edited by Shogun; 11-30-2004 at 07:45 AM.
Shogun is offline

11-30-2004, 09:21 AM	#8
chrismiceli Obsessed with C Join Date: Jan 2003 Posts: 501	Take off the .o in the -l part, like this Code: gcc -o file file.c -lblah /not/ gcc -o file file.c -lblah.o Also make sure the library is in the current directory or a system one for libraries, if not, you have to use the -L option to gcc. __________________ Help populate a c/c++ help irc channel server: irc://irc.efnet.net channel: #c
chrismiceli is offline

11-30-2004, 09:24 AM	#9
Shogun Wannabe Coding God Join Date: Mar 2003 Posts: 259	I don't have the .o in the library, I'm not even calling it,no clue where it came from, I search my SDK when I saw the message and I don't have that very library but I have crt1 and crt2... __________________ They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.
Shogun is offline

11-30-2004, 01:21 PM	#10
Shogun Wannabe Coding God Join Date: Mar 2003 Posts: 259	I made some more searching and I found the following: guess I can't link stuff statically.. I wounder if there is any other way to do it, I'll have to do some more lookin around... __________________ They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.
Shogun is offline

11-30-2004, 01:29 PM	#11
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,630	Driving the linker directly sucks, there is too much to get right. If you really want to know, just compile a small program with the -v option, and see how complex a linker command line can be. This works just fine here Code: $ gcc generic.c && ls -l a.out && file a.out -rwxrwxr-x 11586 Nov 30 19:28 a.out a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), not stripped $ gcc generic.c -static && ls -l a.out && file a.out -rwxrwxr-x 447193 Nov 30 19:28 a.out a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, not stripped Obvious to tell that it's statically linked by the sudden jump in the size of the program executable.
Salem is offline

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