ghc @9.6.4: configure error compiling test program for c++ stdlib flavor

[kippesp (Paul Kippes)]

Tested on m1 architecture with Sonoma 14.4. Attempted to workaround using Xcode 15.3 (current), 15.2, 15.1 with respective command line tool versions. Attached log made with 15.3.

ghc required for graphviz-gui dependency requirement.

Point of failure:

:info:configure checking C++ standard library flavour... ./configure: line 12534: /usr/bin/clang++ -std=gnu++11: No such file or directory
:info:configure configure: error: Failed to compile test program
:info:configure Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_ghc/ghc/work/ghc-9.6.4" && ./configure --prefix=/opt/local --with-gmp-includes=/opt/local/include --with-gmp-libraries=/opt/local/lib --with-iconv-includes=/opt/local/include --with-iconv-libraries=/opt/local/lib 
:info:configure Exit code: 1

[ryandesign (Ryan Carsten Schmidt)]

Because graphviz depends on gd2 which depends on libavif which depends on pandoc which depends on ghc.

So two things should happen:

1. This bug in ghc should be fixed.
2. graphviz should not depend on ghc because that's ridiculous. This should be accomplished either by having libavif not depend on pandoc anymore (for example by not enabling its +docs variant by default or moving libavif documentation to a subport) or, if that's not possible, having gd2 not depend on libavif anymore (that dependency was only recently added; gd2 obviously worked fine for 20 years without it).

[ryandesign (Ryan Carsten Schmidt)]

This problem came up before in #69332.

[AttentionalM (AttentionalM)]

Same error on Ventura 13.6.6

[Lord-Kamina (Gregorio Litenstein)]

Same issue, macports 2.9.3, Intel on Monterey.

Seemingly got around it by installing libavif -docs as @ryandesign mentioned, but it's pretty ridiculous.

[mfacorcoran]

I'm having this same problem building ghc when trying to upgrade py312-jupyterlab:

:info:configure checking whether /usr/bin/clang supports --target... yes
:info:configure checking C++ standard library flavour... ./configure: line 12534: /usr/bin/clang++ -std=gnu++11: No such file or directory
:info:configure configure: error: Failed to compile test program
:info:configure Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_github.com_macports_macports-ports_lang_ghc/ghc/work/ghc-9.6.4" && ./configure --prefix=/opt/local --with-gmp-includes=/opt/local/include --with-gmp-libraries=/opt/local/lib --with-iconv-includes=/opt/local/include --with-iconv-libraries=/opt/local/lib
:info:configure Exit code: 1

any workaround?

[ryandesign (Ryan Carsten Schmidt)]

Has duplicate #69896.

[mcmara (Jack McMara)]

Same issue. Intel on Sonoma 14.5:

:info:configure checking C++ standard library flavour... ./configure: line 12534: /usr/bin/clang++ -std=gnu++11: No such file or directory
:info:configure configure: error: Failed to compile test program
:info:configure Command failed:  cd "/Users/gmarani/dev/install/macports/var/macports/build/_Users_gmarani_dev_install_macports_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_ghc/ghc/work/ghc-9.6.4" && ./configure --prefix=/Users/gmarani/dev/install/macports --with-gmp-includes=/Users/gmarani/dev/install/macports/include --with-gmp-libraries=/Users/gmarani/dev/install/macports/lib --with-iconv-includes=/Users/gmarani/dev/install/macports/include --with-iconv-libraries=/Users/gmarani/dev/install/macports/lib 
:info:configure Exit code: 1
:error:configure Failed to configure ghc: consult /Users/xxxxxx/dev/install/macports/var/macports/build/_Users_xxxxxx_dev_install_macports_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_ghc/ghc/work/ghc-9.6.4/config.log
:error:configure Failed to configure ghc: configure failure: command execution failed
:debug:configure Error code: NONE
:debug:configure Backtrace: configure failure: command execution failed
:debug:configure     while executing
:debug:configure "$procedure $targetname"

Prevents the installation of gnuplot.

[mcmara (Jack McMara)]

Confirmed that also for me (installing gnuplot on Intel/Sonoma 14.5/Macports v2.9.3), I was able to get around the issue by installing libavif -docs as @ryandesign mentioned

[i0ntempest]

I was able to fix (or at least get around) this by editing the configure script, changing two "$CXX" to $CXX. Then the build would start... but fails later with other errors.

[i0ntempest]

In 8508e80bb071542db4fcd736fb9671bf7588fbd1/macports-ports (master):

ghc: explictly set -std=gnu++11

increase log verbosity
Closes: #69566

[ryandesign (Ryan Carsten Schmidt)]

That only solved issue 1 from comment:1; it didn't solve issue 2 which has now been filed again as #70546.