Re: [libmicrohttpd] macOS, gnu gcc, -no-cpp-precomp

[Evgeny Grin]

Hi Chris,

Thanks for the report.
Actually is not needed for a long time, but as MHD is tested by 
OS-supplied tool, it hasn't been noticed (clang still works with this flag).

You can just delete the offending line in configure.ac and run 
'./bootstrap'. This should rebuild 'configure', if you have required 
tools installed.

The next MHD version will be released with fix for this problem.

--
Evgeny


On 21.06.2022 8:06, Chris Guiney wrote:
> I've been being vexed by the configure script using -no-cpp-precomp as a 
> CFLAG if the host is found to be macOS
>
> https://git.gnunet.org/libmicrohttpd.git/tree/configure.ac#n765 
> <https://git.gnunet.org/libmicrohttpd.git/tree/configure.ac#n765>
>
> This flag has been removed from gcc, and according to the maintainers, 
> hasn't been needed for many years
>
> https://gcc.gnu.org/legacy-ml/gcc/2005-12/msg00368.html 
> <https://gcc.gnu.org/legacy-ml/gcc/2005-12/msg00368.html>
>
> I'm hoping that I can either persuade a maintainer to remove it, or 
> provide instruction on how I might remove it -- I've never had to 
> contribute to a GNU project, or contribute to a autoconf/automake build.
>
> I find that if I do remove it, and run autoreconf, it's able to 
> configure and compile cleanly.
>
>
> It manifests as an error indicating that it can't find a suitable 
> threading library:
>
> CC=/opt/homebrew/bin/gcc-11 ./configure --prefix=/usr/local
> ... many lines of configure output ...
> checking for pthread-config... no
> checking for threading lib to use with libmicrohttpd (auto)... 
> configure: error: No threading lib is available. Consider installing 
> pthreads
>
>
> but after viewing the config.log, one can find:
> configure:21066: checking for target host OS
> configure:21075: result: Darwin
> configure:22010: checking whether /opt/homebrew/bin/gcc-11 is Clang
> configure:22037: result: no
> configure:22102: checking whether pthreads work with "-pthread" and 
> "-lpthread"
> configure:22213: /opt/homebrew/bin/gcc-11 -o conftest -no-cpp-precomp 
> -fno-common -g -O2 -pthread   conftest.c -lpthread  >&5
> gcc-11: error: unrecognized command-line option '-no-cpp-precomp'
>
>
> For posterity, the output of gcc --version:
> /opt/homebrew/bin/gcc-11 --version
> gcc-11 (Homebrew GCC 11.3.0_2) 11.3.0
> Copyright (C) 2021 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> I should also note that it does build with clang -- I'm intentionally 
> trying to use gcc
>
> Any help is appreciated,
> Chris

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