Re: implicit declaration of function 'utime' in trailing slashes test

[Tim Rühsen]

Hi Ryan,

./configure scripts are not made for using -Werror in CFLAGS.

This is documented somewhere but (sorry), I am just too tired to search 
for the URL right now.

Regards, Tim

On 21.01.21 01:34, Ryan Schmidt wrote:
> Hi, I'm the maintainer of wget in MacPorts.
>
> In the version of clang included with Xcode 12 and later, implicit declaration 
> of functions is an error.
>
> During configure, wget 1.12.1 prints this:
>
> checking whether utime handles trailing slashes on files... no
>
> config.log contains this:
>
> configure:49368: checking whether utime handles trailing slashes on files
> configure:49414: ccache /usr/bin/clang -o conftest -DNDEBUG -pipe -Os 
> -Werror=implicit-function-declaration -arch x86_64 -I/opt/local/include 
> -L/opt/local/lib -Wl,-headerpad_max_install_names -arch x86_64 conftest.c  >&5
> conftest.c:491:23: error: implicit declaration of function 'utime' is invalid 
> in C99 [-Werror,-Wimplicit-function-declaration]
>                   if (!utime ("conftest.tmp/", NULL))
>                        ^
> 1 error generated.
> configure:49414: $? = 1
> configure: program exited with status 1
>
> So the results of this test don't represent what you want them to.
>
> This configure test uses #include <time.h>. The problem goes away if I change that to 
> #include <utime.h>. Then configure output is still:
>
> checking whether utime handles trailing slashes on files... no
>
> but config.log then contains:
>
> configure:49368: checking whether utime handles trailing slashes on files
> configure:49414: ccache /usr/bin/clang -o conftest -DNDEBUG -pipe -Os 
> -Werror=implicit-function-declaration -arch x86_64 -I/opt/local/include 
> -L/opt/local/lib -Wl,-headerpad_max_install_names -arch x86_64 conftest.c  >&5
> configure:49414: $? = 0
> configure:49414: ./conftest
> configure:49414: $? = 2
> configure: program exited with status 2
>
> Now the results of the test are accurate.
>
> I included this patch in the MacPorts wget 1.12.1 port:
>
> https://github.com/macports/macports-ports/blob/13fd7facb9e1ea9e70b79c8c0b429058b9bb8698/net/wget/files/implicit.patch
>
> Of course you'll want to patch m4/utime.m4 instead of configure.

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