Build Failure: M2, Tahoe 26.4, emacs-mac-30_1_exp

[nathanvy]

Hi,

It wasn't clear to me from the README whether I should open an issue for this, or start a discussion, so here is my build failure that I'd like help with:

• Tahoe 26.4
• branch emacs-mac-30_1_exp, freshly pulled today, HEAD is e97497d
• GCC 15 from homebrew installed

I attempted to run the autogen script:

./autogen.sh
CFLAGS="-I/opt/homebrew/opt/tree-sitter@0.25/include -O2 -mcpu=native" LDDFLAGS="-L/opt/homebrew/opt/tree-sitter@0.25/lib" ./configure --with-native-compilation --with-tree-sitter --enable-mac-app=yes --enable-mac-self-contained --with-rsvg --with-gnutls

It's not clear to me from the readme if I'm specifying the CFLAGS and LDDFLAGS properly. Based on part of the README, it seems I'm supposed to explicitly tell emacs 30 where tree-sitter lives, if I want native comp, so hopefully that's correct. Anyway, running this command results in the usual autotools spam and it ends with:

...
checking for tree-sitter >= 0.20.2... yes
checking for sys/inotify.h... no
checking for libkqueue... no
checking for library containing kqueue... none required
checking for lcms2... yes
checking for library containing inflateEnd... -lz
checking for dladdr... yes
checking for dlfunc... no
checking for gcc_jit_context_acquire in -lgccjit... yes
checking for libgccjit.h... yes
configure: error: The installed libgccjit failed to compile and run a test program using
the libgccjit library; see config.log for the details of the failure.
The test program can be found here:
<https://gcc.gnu.org/onlinedocs/jit/intro/tutorial01.html>.
You can try compiling it yourself to investigate the issues.
Please report the issue to your distribution if libgccjit was installed
through that.
You can find the instructions on how to compile and install libgccjit from
source on this site:
<https://gcc.gnu.org/wiki/JIT>.

[nathanvy]

I can successfully build the test library that libggcjit mentions manually. I believe this is the issue here, from config.log it seems the test program is not linking correctly:

configure:27418: gcc -std=gnu23 -o conftest -I/opt/homebrew/opt/tree-sitter@0.25/include -I/opt/homebrew/opt/libgccgit/include -O2 -mcpu=native -isystem /opt/homebrew/Cellar/librsvg/2.62.1/include/librsvg-2.0 -isy
stem /opt/homebrew/include/gdk-pixbuf-2.0 -isystem /opt/homebrew/opt/libtiff/include -isystem /opt/homebrew/opt/zstd/include -isystem /opt/homebrew/Cellar/xz/5.8.3/include -isystem /opt/homebrew/opt/jpeg-turbo/inc
lude -isystem /opt/homebrew/Cellar/cairo/1.18.4/include/cairo -isystem /opt/homebrew/Cellar/cairo/1.18.4/include -isystem /opt/homebrew/Cellar/pango/1.57.1/include/pango-1.0 -isystem /opt/homebrew/Cellar/glib/2.88
.0/include -isystem /opt/homebrew/Cellar/fribidi/1.0.16/include/fribidi -isystem /opt/homebrew/Cellar/libthai/0.1.30/include -isystem /opt/homebrew/Cellar/libdatrie/0.2.14/include -isystem /opt/homebrew/Cellar/fon
tconfig/2.17.1/include -isystem /opt/homebrew/Cellar/libxext/1.3.7/include -isystem /opt/homebrew/Cellar/xorgproto/2025.1/include -isystem /opt/homebrew/Cellar/libxrender/0.9.12/include -isystem /opt/homebrew/Cell
ar/libx11/1.8.13/include -isystem /opt/homebrew/Cellar/libxcb/1.17.0/include -isystem /opt/homebrew/Cellar/libxau/1.0.12/include -isystem /opt/homebrew/Cellar/libxdmcp/1.1.5/include -isystem /opt/homebrew/Cellar/p
ixman/0.46.4/include/pixman-1 -isystem /opt/homebrew/Cellar/harfbuzz/14.1.0/include/harfbuzz -isystem /opt/homebrew/opt/freetype/include/freetype2 -isystem /opt/homebrew/opt/libpng/include/libpng16 -isystem /opt/h
omebrew/Cellar/graphite2/1.3.14/include -isystem /Library/Developer/CommandLineTools/SDKs/MacOSX26.sdk/usr/include/ffi -isystem /opt/homebrew/Cellar/glib/2.88.0/include/glib-2.0 -isystem /opt/homebrew/Cellar/glib/
2.88.0/lib/glib-2.0/include -isystem /opt/homebrew/opt/gettext/include -isystem /opt/homebrew/Cellar/pcre2/10.47_1/include -I/opt/homebrew/Cellar/libgccjit/15.2.0/include    -L/opt/homebrew/opt/tree-sitter@0.25/li
b -L/opt/homebrew/opt/libgccjit/lib/gcc/current -L/opt/homebrew/Cellar/gcc/15.2.0_1/lib/gcc/current/gcc/aarch64-apple-darwin25/15 -lemutls_w conftest.c -lgccjit -lsqlite3   -L/opt/homebrew/Cellar/libgccjit/15.2.0/
lib/gcc/current >&5 
configure:27418: $? = 0
configure:27418: ./conftest
ld: library 'emutls_w' not found
libgccjit.so: error: error invoking gcc driver
configure:27418: $? = 1
configure: program exited with status 1

The only instance of emutls_w in homebrew appears to be this one:

$ find /opt/homebrew -name '*emutls*'
/opt/homebrew/Cellar/gcc/15.2.0_1/lib/gcc/current/gcc/aarch64-apple-darwin25/15/libemutls_w.a

But my understanding is that this is not a stable path to rely on. Nevertheless, maybe my OS and/or homebrew install is completely fucked, but I was finally able to resolve the build failure with the following:

export LIBRARY_PATH=/opt/homebrew/Cellar/gcc/15.2.0_1/lib/gcc/current/gcc/aarch64-apple-darwin25/15
./configure [...]

[jdtsmith]

Not sure on this one. Can you brew update/upgrade to be sure your gcc and libgccjit are in sync (or possibly reinstall them)? Here I'm on:

==> libgccjit ✔: stable 15.2.0 (bottled), HEAD
JIT library for the GNU compiler collection
==> gcc ✔: stable 15.2.0 (bottled), HEAD
GNU compiler collection

[nathanvy]

Yeah it's a strange one. I can confirm I'm on the same versions as you:

➜  .emacs.d git:(master) ✗ brew info libgccjit gcc    
==> libgccjit ✔: stable 15.2.0 (bottled), HEAD

[...]

==> gcc ✔: stable 15.2.0 (bottled), HEAD
GNU compiler collection
[...]