Undefined symbols for architecture x86_64 and linker command failed with exit code 1
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I run the following code from APUE
#include "apue.h"
#include <sys/wait.h>
void pr_exit(int status)
{
if (WIFEXITED(status))
printf("normal termination, exit status = %dn",
WEXITSTATUS(status));
else if (WIFSIGNALED(status))
printf("abnormal termination, signal number = %d%sn",
WTERMSIG(status),
#ifdef WCOREDUMP
WCOREDUMP(status) ? " (core file generated)" : "");
#else
"");
#endif
else if (WIFSTOPPED(status))
printf("child stopped, signal number = %dn",
WSTOPSIG(status));
}
but get error:
$ cc my_wait.c
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I checked multiple times and ensure there no difference with the book's instruction ..
How could I solve the problem?
c
asked Nov 17 '18 at 5:04
JawSawJawSaw
4,97311940
add a comment |
I run the following code from APUE
#include "apue.h"
#include <sys/wait.h>
void pr_exit(int status)
{
if (WIFEXITED(status))
printf("normal termination, exit status = %dn",
WEXITSTATUS(status));
else if (WIFSIGNALED(status))
printf("abnormal termination, signal number = %d%sn",
WTERMSIG(status),
#ifdef WCOREDUMP
WCOREDUMP(status) ? " (core file generated)" : "");
#else
"");
#endif
else if (WIFSTOPPED(status))
printf("child stopped, signal number = %dn",
WSTOPSIG(status));
}
but get error:
$ cc my_wait.c
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I checked multiple times and ensure there no difference with the book's instruction ..
How could I solve the problem?
c
asked Nov 17 '18 at 5:04
JawSawJawSaw
4,97311940
It seems you need to get a beginners book or two about C and read from the very start.
– Some programmer dude
Nov 17 '18 at 5:05
1
The error message says "there is no functionmain()", and the source code you show has no functionmain(), so there's minimal surprise that there's an error message. Where did you thinkmain()was going to come from?
– Jonathan Leffler
Nov 17 '18 at 5:30
ty, could you please transmit the comment to answer. @JonathanLeffler
– JawSaw
Nov 17 '18 at 6:47
add a comment |
I run the following code from APUE
#include "apue.h"
#include <sys/wait.h>
void pr_exit(int status)
{
if (WIFEXITED(status))
printf("normal termination, exit status = %dn",
WEXITSTATUS(status));
else if (WIFSIGNALED(status))
printf("abnormal termination, signal number = %d%sn",
WTERMSIG(status),
#ifdef WCOREDUMP
WCOREDUMP(status) ? " (core file generated)" : "");
#else
"");
#endif
else if (WIFSTOPPED(status))
printf("child stopped, signal number = %dn",
WSTOPSIG(status));
}
but get error:
$ cc my_wait.c
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I checked multiple times and ensure there no difference with the book's instruction ..
How could I solve the problem?
c
asked Nov 17 '18 at 5:04
JawSawJawSaw
4,97311940
I run the following code from APUE
#include "apue.h"
#include <sys/wait.h>
void pr_exit(int status)
{
if (WIFEXITED(status))
printf("normal termination, exit status = %dn",
WEXITSTATUS(status));
else if (WIFSIGNALED(status))
printf("abnormal termination, signal number = %d%sn",
WTERMSIG(status),
#ifdef WCOREDUMP
WCOREDUMP(status) ? " (core file generated)" : "");
#else
"");
#endif
else if (WIFSTOPPED(status))
printf("child stopped, signal number = %dn",
WSTOPSIG(status));
}
but get error:
$ cc my_wait.c
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I checked multiple times and ensure there no difference with the book's instruction ..
How could I solve the problem?
c
c
asked Nov 17 '18 at 5:04
JawSawJawSaw
4,97311940
asked Nov 17 '18 at 5:04
JawSawJawSaw
4,97311940
asked Nov 17 '18 at 5:04
JawSawJawSaw
4,97311940
asked Nov 17 '18 at 5:04
JawSawJawSaw
4,97311940
asked Nov 17 '18 at 5:04
JawSawJawSaw
4,97311940
4,97311940
It seems you need to get a beginners book or two about C and read from the very start.
– Some programmer dude
Nov 17 '18 at 5:05
1
The error message says "there is no functionmain()", and the source code you show has no functionmain(), so there's minimal surprise that there's an error message. Where did you thinkmain()was going to come from?
– Jonathan Leffler
Nov 17 '18 at 5:30
ty, could you please transmit the comment to answer. @JonathanLeffler
– JawSaw
Nov 17 '18 at 6:47
add a comment |
It seems you need to get a beginners book or two about C and read from the very start.
– Some programmer dude
Nov 17 '18 at 5:05
1
The error message says "there is no functionmain()", and the source code you show has no functionmain(), so there's minimal surprise that there's an error message. Where did you thinkmain()was going to come from?
– Jonathan Leffler
Nov 17 '18 at 5:30
ty, could you please transmit the comment to answer. @JonathanLeffler
– JawSaw
Nov 17 '18 at 6:47
It seems you need to get a beginners book or two about C and read from the very start.
– Some programmer dude
Nov 17 '18 at 5:05
It seems you need to get a beginners book or two about C and read from the very start.
– Some programmer dude
Nov 17 '18 at 5:05
1
1
The error message says "there is no function
main()", and the source code you show has no function main(), so there's minimal surprise that there's an error message. Where did you think main() was going to come from?– Jonathan Leffler
Nov 17 '18 at 5:30
The error message says "there is no function
main()", and the source code you show has no function main(), so there's minimal surprise that there's an error message. Where did you think main() was going to come from?– Jonathan Leffler
Nov 17 '18 at 5:30
ty, could you please transmit the comment to answer. @JonathanLeffler
– JawSaw
Nov 17 '18 at 6:47
ty, could you please transmit the comment to answer. @JonathanLeffler
– JawSaw
Nov 17 '18 at 6:47
add a comment |
1 Answer
1
active
oldest
votes
Transferring a comment into an answer, as requested.
The error message says "there is no function main()", and the source code you show has no function main(), so there's minimal surprise that there's that error message.
Where did you think main() was going to come from?
When you build a program, there needs to be a main() from somewhere, and the standard C library does not provide an implementation. (If you work with Flex or Lex, or Bison or Yacc, you may find minimal main() programs in their libraries, but these are an exception, not the rule.)
answered Nov 17 '18 at 6:50
Jonathan LefflerJonathan Leffler
576k956911043
add a comment |
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votes
Transferring a comment into an answer, as requested.
The error message says "there is no function main()", and the source code you show has no function main(), so there's minimal surprise that there's that error message.
Where did you think main() was going to come from?
When you build a program, there needs to be a main() from somewhere, and the standard C library does not provide an implementation. (If you work with Flex or Lex, or Bison or Yacc, you may find minimal main() programs in their libraries, but these are an exception, not the rule.)
answered Nov 17 '18 at 6:50
Jonathan LefflerJonathan Leffler
576k956911043
add a comment |
Transferring a comment into an answer, as requested.
The error message says "there is no function main()", and the source code you show has no function main(), so there's minimal surprise that there's that error message.
Where did you think main() was going to come from?
When you build a program, there needs to be a main() from somewhere, and the standard C library does not provide an implementation. (If you work with Flex or Lex, or Bison or Yacc, you may find minimal main() programs in their libraries, but these are an exception, not the rule.)
answered Nov 17 '18 at 6:50
Jonathan LefflerJonathan Leffler
576k956911043
add a comment |
Transferring a comment into an answer, as requested.
The error message says "there is no function main()", and the source code you show has no function main(), so there's minimal surprise that there's that error message.
Where did you think main() was going to come from?
When you build a program, there needs to be a main() from somewhere, and the standard C library does not provide an implementation. (If you work with Flex or Lex, or Bison or Yacc, you may find minimal main() programs in their libraries, but these are an exception, not the rule.)
answered Nov 17 '18 at 6:50
Jonathan LefflerJonathan Leffler
576k956911043
Transferring a comment into an answer, as requested.
The error message says "there is no function main()", and the source code you show has no function main(), so there's minimal surprise that there's that error message.
Where did you think main() was going to come from?
When you build a program, there needs to be a main() from somewhere, and the standard C library does not provide an implementation. (If you work with Flex or Lex, or Bison or Yacc, you may find minimal main() programs in their libraries, but these are an exception, not the rule.)
answered Nov 17 '18 at 6:50
Jonathan LefflerJonathan Leffler
576k956911043
answered Nov 17 '18 at 6:50
Jonathan LefflerJonathan Leffler
576k956911043
answered Nov 17 '18 at 6:50
Jonathan LefflerJonathan Leffler
576k956911043
answered Nov 17 '18 at 6:50
Jonathan LefflerJonathan Leffler
576k956911043
576k956911043
add a comment |
add a comment |
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It seems you need to get a beginners book or two about C and read from the very start.
– Some programmer dude
Nov 17 '18 at 5:05
1
The error message says "there is no function
main()", and the source code you show has no functionmain(), so there's minimal surprise that there's an error message. Where did you thinkmain()was going to come from?– Jonathan Leffler
Nov 17 '18 at 5:30
ty, could you please transmit the comment to answer. @JonathanLeffler
– JawSaw
Nov 17 '18 at 6:47