Thanks Vanessa, it seems you had the same workaround: " remove and reinstall XCode command-line tools." Zubin What OS were the install tests run on? I'm running on 15.0.1. I think 15.1 is coming at the end of the month around the same time as alpha 2, hopefully 15.1 will be accompanied by a new version of XCode command-line tools that resolves these issues. On Wed, Oct 16, 2024 at 7:58 PM Vanessa McHale wrote:

I encountered something similar, Apple had been majorly slacking.

[image: 89166504e40f4869ea825dd70048017861ec8578.png]

Cabal can't find C++ headers for digest/text on Mac (Sequoia) https://discourse.haskell.org/t/cabal-cant-find-c-headers-for-digest-text-on... discourse.haskell.org https://discourse.haskell.org/t/cabal-cant-find-c-headers-for-digest-text-on...

https://discourse.haskell.org/t/cabal-cant-find-c-headers-for-digest-text-on...

On Oct 16, 2024, at 3:53 PM, George Colpitts wrote:

 It worked for me on my M2 mac but only after uninstalling and reinstalling Command Line Tools.

Hopefully the problem I had was unique to me. I got an error when I ran ./configure on my M2 mac:

checking C++ standard library flavour... actest.cpp:1:10: fatal error: 'iostream' file not found 1 | #include <iostream> | ^~~~~~~~~~ 1 error generated. configure: error: Failed to compile test program

Following is the complete output I got

checking for opt-17... no checking for opt-17.0... no checking for opt17... no checking for opt-16... no checking for opt-16.0... no checking for opt16... no checking for opt-15... no checking for opt-15.0... no checking for opt15... no checking for opt-14... no checking for opt-14.0... no checking for opt14... no checking for opt-13... no checking for opt-13.0... no checking for opt13... no checking for opt... opt checking opt version (18.1.8) is between 13 and 20... yes checking for clang-19... no checking for clang-19.0... no checking for clang19... no checking for clang-18... clang-18 checking clang-18 version (18.1.8) is between 13 and 20... yes configure: $CC is not gcc; assuming it's a reasonably new C compiler checking whether CC supports -no-pie... no checking whether CC supports flags passed by GHC when compiling via C... yes checking Setting up CFLAGS, LDFLAGS, IGNORE_LINKER_LD_FLAGS and CPPFLAGS... done checking Setting up CONF_CC_OPTS_STAGE0, CONF_GCC_LINKER_OPTS_STAGE0, CONF_LD_LINKER_OPTS_STAGE0 and CONF_CPP_OPTS_STAGE0... done checking Setting up CONF_CC_OPTS_STAGE1, CONF_GCC_LINKER_OPTS_STAGE1, CONF_LD_LINKER_OPTS_STAGE1 and CONF_CPP_OPTS_STAGE1... done checking Setting up CONF_CC_OPTS_STAGE2, CONF_GCC_LINKER_OPTS_STAGE2, CONF_LD_LINKER_OPTS_STAGE2 and CONF_CPP_OPTS_STAGE2... done checking whether ld64 requires -no_fixup_chains... yes checking whether ld64 requires -no_fixup_chains... yes checking whether ld64 requires -no_fixup_chains... yes checking whether ld64 requires -no_fixup_chains... yes checking whether the linker requires -no_warn_duplicate_libraries... yes checking whether the linker requires -no_warn_duplicate_libraries... yes checking whether the linker requires -no_warn_duplicate_libraries... yes checking whether ld supports response files... yes checking C++ standard library flavour... actest.cpp:1:10: fatal error: 'iostream' file not found 1 | #include <iostream> | ^~~~~~~~~~ 1 error generated. configure: error: Failed to compile test program

On Wed, Oct 16, 2024 at 8:51 AM Zubin Duggal wrote:

...

The GHC developers are very pleased to announce the availability of the first alpha release of GHC 9.12.1. Binary distributions, source distributions, and documentation are available at [downloads.haskell.org ][].

We hope to have this release available via ghcup shortly.

GHC 9.12 will bring a number of new features and improvements, including:

* The new language extension [OrPatterns] allowing you to combine multiple pattern clauses into one.

* The [MultilineStrings] language extension to allow you to more easily write strings spanning multiple lines in your source code.

* Improvements to the OverloadedRecordDot extension, allowing the built-in `HasField` class to be used for records with fields of non lifted representations.

* The [NamedDefaults] language extension has been introduced allowing you to define defaults for typeclasses other than `Num`.

* More deterministic object code output, controlled by the `-fobject-determinism` flag, which improves determinism of builds a lot (though does not fully do so) at the cost of some compiler performance (1-2%). See #12935 for the details

* GHC now accepts type syntax in expressions as part of [GHC Proposal #281].

* ... and many more

A full accounting of changes can be found in the [release notes][]. As always, GHC's release status, including planned future releases, can be found on the GHC Wiki [status][].

We would like to thank GitHub, IOG, the Zw3rk stake pool, Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, the Haskell Foundation, and other anonymous contributors whose on-going financial and in-kind support has facilitated GHC maintenance and release management over the years. Finally, this release would not have been possible without the hundreds of open-source contributors whose work comprise this release.

As always, do give this release a try and open a [ticket][] if you see anything amiss.

[release notes]: https://downloads.haskell.org/ghc/9.12.1-alpha1/docs/users_guide/9.12.1-note... [status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status [downloads.haskell.org]: https://downloads.haskell.org/ghc/9.12.1-alpha1 [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new [OrPatterns]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0522-or... [MultilineStrings]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0569-mu... [GHC Proposal #281]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0281-vi... [NamedDefaults]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0409-ex...

Cheers, Zubin _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

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