compilation problem warn_unused_result [-Wunused-result]

[attila-bial-cn]

Hello,
I've got the following error when trying to build:

$ autoconf
$ ./configure
...
$ make
make[1]: Entering directory '/home/bial/src/lux/src'
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_debug.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_html.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_interpret.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_log.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_suite.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_tap.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_parse.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_shell.erl
"/home/bial/tailf/ncs-4.0/bin/erlc" +warnings_as_errors +warn_unused_vars +debug_info -o ../ebin lux_utils.erl
sed -e "s/%VSN%/1.8.6/g" < lux.app.src > ../ebin/lux.app
make[1]: Leaving directory '/home/bial/src/lux/src'
make[1]: Entering directory '/home/bial/src/lux/c_src'
gcc -o ../priv/bin/runpty -g -O2 -Wall runpty.c
runpty.c: In function ‘main’:
runpty.c:98:5: warning: ignoring return value of ‘setuid’, declared with attribute warn_unused_result [-Wunused-result]
setuid(getuid());
^
make[1]: Leaving directory '/home/bial/src/lux/c_src'

I workarounded it by adding '-Wno-unused-result' to CFLAGS in include.mk file at line 29 before invoking 'make'.

My system is Ubuntu 15.04 with the following build tools:
gcc (Ubuntu 4.9.2-10ubuntu13) 4.9.2
autoconf 2.69
GNU Make 4.0

[novakmi]

fix

(void)setuid(getuid());

does not seem to be working with latest gcc compiler
http://stackoverflow.com/questions/11888594/ignoring-return-values-in-c

I had to change it to
if (setuid(getuid()));

[hawk]

Thanks. I have added your fix on the develop branch.

/Håkan

On Mon, May 23, 2016 at 11:55 AM, novakmi [email protected] wrote:

fix

(void)setuid(getuid());

does not seem to be working with latest gcc compiler
http://stackoverflow.com/questions/11888594/ignoring-return-values-in-c

I had to change it to
if (setuid(getuid()));

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