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On 07/17/2011 05:10 PM, Thomas Dickey wrote:
> You're seeing implicit for get_wch, since there's no _XOPEN_SOURCE_EXTENDED
> in the compile line.
Okay, after checking:
bear@janus:~/src/xxh$ make display.o
gcc -D_XOPEN_SOURCE_EXTENDED -Wall -Werror -lncursesw -c -o display.o \
display.c
bear@janus:~/src/xxh$
using the compile line to specify the option (in this case in addition
to #define _XOPEN_SOURCE_EXTENDED at the beginning of the file) bypasses
the problem.
These two methods of establishing a compile option are supposed to be
equivalent according to gcc's online docs, but here we have a case where
specifying the option on the compile line seems to make the functions
linkable even with -Wall and -Werror, while specifying it by #define at
the start of the file instead exposes a bug where -Wall or -Werror
prevent linking.
This is a clearly superior workaround, since it leaves the functionality
of -Wall and -Werror intact. But this is still a bug;
these things are supposed to be equivalent, and neither is supposed
to be affected by these "unrelated" build options.
Bear
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