GCC 15 fails to install

[tobbi]

Output of brew config

% brew config
HOMEBREW_VERSION: 4.6.8-15-gbd57ad8
ORIGIN: https://github.com/Homebrew/brew
HEAD: bd57ad891d076c9854f1b3be3bf55523f3549998
Last commit: 6 hours ago
Branch: main
Core tap HEAD: fbbdae0bb3ed579cd05d650ac211e4b718cd3379
Core tap last commit: 3 hours ago
Core tap JSON: 03 Sep 20:35 UTC
Core cask tap HEAD: 255bd099555e9d6e06472c6adab0170586e10b47
Core cask tap last commit: 3 hours ago
Core cask tap JSON: 03 Sep 20:35 UTC
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: /private/tmp/com.apple.launchd.RW8BSPOSbM/org.xquartz:0
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_MAKE_JOBS: 8
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.4.5 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/3.4.5/bin/ruby
CPU: octa-core 64-bit ivybridge
Clang: 14.0.0 build 1400
Git: 2.37.1 => /Volumes/Development/Xcode.app/Contents/Developer/usr/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 12.7.6-x86_64
CLT: 14.2.0.0.1.1668646533
Xcode: 14.2 => /Volumes/Development/Xcode.app/Contents/Developer

Output of brew doctor

% brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed casks are deprecated or disabled.
You should find replacements for the following casks:
  gstreamer-runtime
  wine@devel

Warning: Some installed kegs have no formulae!
This means they were either deleted or installed manually.
You should find replacements for the following formulae:
  python-flit-core

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  icu4c@75
  icu4c@76
  node@18
  openssl@1.1
  protobuf@21
  tinyxml

Warning: You have booted macOS using OpenCore Legacy Patcher.
We do not provide support for this configuration.

This is a Tier 2 configuration:
  https://docs.brew.sh/Support-Tiers#tier-2
You can report Tier 2 unrelated issues to Homebrew/* repositories!
Read the above document instead before opening any issues or PRs.


Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected header files:
  /usr/local/include/node/*
  /usr/local/include/qemu-plugin.h

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause formulae that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  qt@4
  node

Warning: You are using macOS 12.
We (and Apple) do not provide support for this old version.

This is a Tier 3 configuration:
  https://docs.brew.sh/Support-Tiers#tier-3
You can report Tier 3 unrelated issues to Homebrew/* repositories!
Read the above document instead before opening any issues or PRs.

Description of issue

I can't install the latest version of gcc on my machine.

I keep getting this error:

clang++ -std=c++14 -c  -DBASEVER="\"15.1.0\"" -DDATESTAMP="\"\"" -DREVISION="\"\"" -DDEVPHASE="\"\"" -DPKGVERSION="\"(Homebrew GCC 15.1.0) \"" -DBUGURL="\"<https://github.com/Homebrew/homebrew-core/issues>\"" -g -DIN_GCC   -fno-strict-aliasing -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings -Wcast-qual -Wno-format -Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings  -DHAVE_CONFIG_H  -DGENERATOR_FILE -I. -Ibuild -I../../gcc -I../../gcc/build -I../../gcc/../include  -I../../gcc/../libcpp/include  \
	-o build/genversion.o ../../gcc/genversion.cc
../../gcc/doc//extend.texi:10002: warning: `.' or `,' must follow @xref, not `)'.
../../gcc/doc//extend.texi:10682: First argument to cross-reference may not be empty.
../../gcc/doc//extend.texi:10704: First argument to cross-reference may not be empty.
../../gcc/doc//extend.texi:12572: warning: `.' or `,' must follow @xref, not `)'.
../../gcc/doc//extend.texi:12576: warning: `.' or `,' must follow @xref, not `)'.
../../gcc/doc//gcov.texi:1080: @anchor expected braces.
../../gcc/doc//gcov.texi:1080: ` {gcov prime paths example}
When you com...' is too long for expansion; not expanded.
../../gcc/doc//gcov.texi:1080: @anchor missing close brace.
../../gcc/doc//gcov.texi:112: Next reference to nonexistent node `Gcov and Optimization' (perhaps incorrect sectioning?).
../../gcc/doc//gcov.texi:44: Menu reference to nonexistent node `Freestanding Environments' (perhaps incorrect sectioning?).
../../gcc/doc//gcov.texi:43: Menu reference to nonexistent node `Cross-profiling' (perhaps incorrect sectioning?).
../../gcc/doc//gcov.texi:42: Menu reference to nonexistent node `Gcov Data Files' (perhaps incorrect sectioning?).
../../gcc/doc//gcov.texi:41: Menu reference to nonexistent node `Gcov and Optimization' (perhaps incorrect sectioning?).
../../gcc/doc//invoke.texi:17655: Cross reference to nonexistent node `Cross-profiling' (perhaps incorrect sectioning?).
../../gcc/doc//invoke.texi:17642: Cross reference to nonexistent node `gcov prime paths example' (perhaps incorrect sectioning?).
makeinfo: Removing output file `doc/gcc.info' due to errors; use --force to preserve.
gmake[3]: *** [Makefile:3787: doc/gcc.info] Error 1
gmake[3]: *** Waiting for unfinished jobs....
/bin/sh ../../gcc/../move-if-change tmp-optionlist optionlist
echo timestamp > s-options
rm gcc.pod
gmake[3]: Leaving directory '/private/tmp/gcc-20250903-23571-3w5a10/gcc-15.1.0/build/gcc'
gmake[2]: *** [Makefile:5073: all-stage1-gcc] Error 2
gmake[2]: Leaving directory '/private/tmp/gcc-20250903-23571-3w5a10/gcc-15.1.0/build'
gmake[1]: *** [Makefile:24631: stage1-bubble] Error 2
gmake[1]: Leaving directory '/private/tmp/gcc-20250903-23571-3w5a10/gcc-15.1.0/build'
gmake: *** [Makefile:1101: all] Error 2

HOMEBREW_VERSION: 4.6.8-15-gbd57ad8
ORIGIN: https://github.com/Homebrew/brew
HEAD: bd57ad891d076c9854f1b3be3bf55523f3549998
Last commit: 3 hours ago
Branch: main
Core tap HEAD: fbbdae0bb3ed579cd05d650ac211e4b718cd3379
Core tap last commit: 35 minutes ago
Core tap JSON: 03 Sep 20:35 UTC
Core cask tap HEAD: 255bd099555e9d6e06472c6adab0170586e10b47
Core cask tap last commit: 37 minutes ago
Core cask tap JSON: 03 Sep 20:35 UTC
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: /private/tmp/com.apple.launchd.RW8BSPOSbM/org.xquartz:0
HOMEBREW_MAKE_JOBS: 8
HOMEBREW_NO_BOOTSNAP: set
HOMEBREW_NO_INSTALL_FROM_API: set
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.4.5 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/3.4.5/bin/ruby
CPU: octa-core 64-bit ivybridge
Clang: 14.0.0 build 1400
Git: 2.37.1 => /Volumes/Development/Xcode.app/Contents/Developer/usr/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 12.7.6-x86_64
CLT: 14.2.0.0.1.1668646533
Xcode: 14.2 => /Volumes/Development/Xcode.app/Contents/Developer

HOMEBREW_CC: clang
HOMEBREW_CXX: clang++
MAKEFLAGS: -j8
CMAKE_PREFIX_PATH: /usr/local
CMAKE_INCLUDE_PATH: /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers
CMAKE_LIBRARY_PATH: /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/OpenGL.framework/Versions/Current/Libraries
PKG_CONFIG_PATH: /usr/local/opt/gmp/lib/pkgconfig:/usr/local/opt/isl/lib/pkgconfig:/usr/local/opt/mpfr/lib/pkgconfig:/usr/local/opt/lz4/lib/pkgconfig:/usr/local/opt/xz/lib/pkgconfig:/usr/local/opt/zstd/lib/pkgconfig
PKG_CONFIG_LIBDIR: /usr/lib/pkgconfig:/usr/local/Homebrew/Library/Homebrew/os/mac/pkgconfig/12
HOMEBREW_MAKE_JOBS: 8
HOMEBREW_GIT: git
HOMEBREW_SDKROOT: /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk
ACLOCAL_PATH: /usr/local/share/aclocal
PATH: /usr/local/Homebrew/Library/Homebrew/shims/mac/super:/usr/local/opt/lz4/bin:/usr/local/opt/xz/bin:/usr/local/opt/zstd/bin:/usr/local/opt/make/bin:/usr/bin:/bin:/usr/sbin:/sbin

Full log:
02.gmake.log

[ZhongRuoyu]

GCC 15.1 docs failed to build with old makeinfo and this was already fixed upstream. You can try applying the following two patches.

• gcc-mirror/gcc@e1a2af2
• gcc-mirror/gcc@8b435e1

PS: An update that fixes a performance issue has just been applied to GCC (Homebrew/homebrew-core#235988). You may want to update your local tap in case you haven't.

[tobbi]

I'm gonna do that and check again. By the way: How would one update makeinfo? Is that also something that's installed through homebrew?

[ZhongRuoyu]

How would one update makeinfo? Is that also something that's installed through homebrew?

That's bundled with macOS (as part of the texinfo package) and available at /usr/bin/makeinfo. It was removed since macOS Sequoia 13. (We seem to be pulling the texinfo dependency indirectly so our official builds still work.) You can also work around this by adding a direct dependency depends_on "texinfo" => :build.

[tobbi]

Alright, was just curious. I applied those two patches mentioned above and it appears to be building for now. Will close this thread once it's done.

[tobbi]

Okay, I'm getting a new error:
02.gmake.log

It's really hard to read as the output is so mangled. Maybe this?

checking whether time.h and sys/time.h may both be included... ../../gcc/doc//extend.texi:10002: warning: `.' or `,' must follow @xref, not `)'.
../../gcc/fortran//intrinsic.texi:14978: Unknown command `cindex,'.
../../gcc/doc//extend.texi:12572: warning: `.' or `,' must follow @xref, not `)'.
../../gcc/doc//extend.texi:12576: warning: `.' or `,' must follow @xref, not `)'.
makeinfo: Removing output file `doc/gfortran.info' due to errors; use --force to preserve.
gmake[3]: *** [../../gcc/fortran/Make-lang.in:203: doc/gfortran.info] Error 1
gmake[3]: *** Waiting for unfinished jobs....

[ZhongRuoyu]

Seems like another makeinfo issue. At this point I would try switching over to Homebrew texinfo instead.

[tobbi]

Alright, it's building again. Can the formula itself check for an outdated version of texinfo and install the homebrew one in that case? Although I'm aware I'm using a not-supported version of OS X.

[ZhongRuoyu]

Alright, it's building again. Can the formula itself check for an outdated version of texinfo and install the homebrew one in that case? Although I'm aware I'm using a not-supported version of OS X.

Yes, it's possible and already used in some formulae like gdb:

on_system :linux, macos: :ventura_or_newer do
  depends_on "texinfo" => :build
end

Though, I'm not clear why the info docs are even being built, because according to GCC docs:

Releases contain Info documentation pre-built for the unmodified documentation in the release.

So it sounds like the docs don't actually need to be (re-)built.

[tobbi]

Yeah, I tried to disable building the docs (and according to the GCC IRC channel, there's supposed to be a configure flag that can be passed) but I couldn't find one.

[tobbi]

The GCC build ran through successfully. I'm closing this.