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implicit declaration of function 'utime' in trailing slashes test


From: Ryan Schmidt
Subject: implicit declaration of function 'utime' in trailing slashes test
Date: Wed, 20 Jan 2021 18:34:06 -0600

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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