warning: implicit declaration of function 'sym_forget' is invalid in C99

[zhifeng yang]

Hi all

I use the following command to compile a .c file and got the error as below.

cc -DIWORDSIZE=4 -DMAX_HISTORY=25 -DNMM_CORE=0 -c -g registry.c
registry.c:60:3: warning: implicit declaration of function 'sym_forget' is invalid in C99 [-Wimplicit-function-declaration]
sym_forget() ;

I am sure it is due to the cc flag. But I am not sure which flag causes this error. Can anybody help me? thank you

Bruce

[Jeremy Lavergne]

That warning (implicit function declaration) likely means the source code is using a function before having it defined. You’ll need to edit the source (fixes the cause), or ask clang to use an older c standard (fixes only the symptom).

Post by zhifeng yang
I use the following command to compile a .c file and got the error as below.
cc -DIWORDSIZE=4 -DMAX_HISTORY=25 -DNMM_CORE=0 -c -g registry.c
registry.c:60:3: warning: implicit declaration of function 'sym_forget' is invalid in C99 [-Wimplicit-function-declaration]
sym_forget() ;
I am sure it is due to the cc flag. But I am not sure which flag causes this error. Can anybody help me? thank you

[bruceyoung01]

The code is downloaded from online. Actually it's a model(WRF). There are
tons of similar warning is my comfile log file. Like the following

cc -DIWORDSIZE=4 -DMAX_HISTORY=25 -DNMM_CORE=0 -c -g registry.c
registry.c:60:3: warning: implicit declaration of function 'sym_forget' is
invalid in C99 [-Wimplicit-function-declaration]
sym_forget() ;
^
registry.c:132:3: warning: implicit declaration of function
'gen_io_boilerplate' is invalid in C99 [-Wimplicit-function-declaration]
gen_io_boilerplate() ; /* 20091213 jm. Generate the
io_boilerplate_temporary.inc file */
^
registry.c:134:3: warning: implicit declaration of function 'init_parser' is
invalid in C99 [-Wimplicit-function-declaration]
init_parser() ;
^
registry.c:157:8: warning: implicit declaration of function 'pre_parse' is
invalid in C99 [-Wimplicit-function-declaration]
if ( pre_parse( dir, fp_in, fp_tmp ) ) {
^
registry.c:177:3: warning: implicit declaration of function 'check_dimspecs'
is invalid in C99 [-Wimplicit-function-declaration]
check_dimspecs() ;




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[bruceyoung01]

how to specify old standard in the flag?



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Sent from the MacPorts - Users mailing list archive at Nabble.com.

[Jeremy Lavergne]

http://clang.llvm.org/docs/UsersManual.html#differences-between-various-standard-modes

Post by bruceyoung01
how to specify old standard in the flag?