Re: How can I check if a function exists in waf?

[Sebastian Huber]

On 01/02/2019 10:06, Vijay Kumar Banerjee wrote:

On Fri, 1 Feb 2019 at 12:13, Sebastian Huber 
<sebastian.hu...@embedded-brains.de 
<mailto:sebastian.hu...@embedded-brains.de>> wrote:

    Hello,

    how can I check if a function exists in waf (similar to
    AC_CHECK_FUNC)?
    Currently, we get this output from the RTEMS tools waf configure
    (please
    note the "Invalid argument 'function_name' in test"):

Hi,

The support for 'function_name' has been removed since waf 2 as it
was broken ( see 
https://gitlab.com/ita1024/waf/blob/master/waflib/Tools/c_config.py#L420)

Nice.


I guess the best option is to just use 'header_name' or to use the 
'fragment' parameter to write a fragment that calls the desired function.

So, there is no standard compile and link test for functions? If I use this

    conf.check_cc(fragment = 'int main(void) { strnlen("", 0); return 
0; }',
                  header_name="string.h", features = 'c', mandatory = 
False)

waf outputs

Checking for header string.h                  : yes

I don't want to test for string.h, I want to test for strnlen(). In 
config.log we have:

---------------------------------------------
Checking for header string.h
==>
int main(void) { strnlen("", 0); return 0; }
<==
[1/1] Compiling 
build/.conf_check_6da1e91772980301eb2528a1d150a7ab/test.c

['/usr/bin/gcc', '../test.c', '-c', 
'-o/scratch/git-rtems-tools/build/.conf_check_6da1e91772980301eb2528a1d150a7ab/testbuild/test.c.1.o']
err: ../test.c: In function ‘main’:
../test.c:1:18: warning: implicit declaration of function ‘strnlen’ 
[-Wimplicit-function-declaration]
 int main(void) { strnlen("", 0); return 0; }
                  ^~~~~~~

yes
---------------------------------------------

So, this test uses already quite some code and still is basically useless.

--
Sebastian Huber, embedded brains GmbH

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