Scipy doesn't build on Mac OS

[ksjogo]

🐛 Bug

Running env PYODIDE_PACKAGES="scipy" make on Mac OS with the latest Xcode CLI tools will error out with the following:

../../meson.build:82:0: ERROR: Unable to detect linker for compiler `/var/folders/gs/_09x7sbx28qblghy92lydm0c0000gn/T/tmp00vmch6v/gfortran             
-Wl,--version`                                                                                                                                         
stdout:                                                                                                                                                
stderr: collect2 version 13.2.0                                                                                                                        
/usr/bin/ld -syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk/ -dynamic -arch arm64 -platform_version macos 14.0.0 0.0 -o a.out        
-L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin23/13 -L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc    
-L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin23/13/../../.. --version -lemutls_w -lgcc -lSystem -no_compact_unwind 
-rpath @loader_path -rpath /opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc/aarch64-apple-darwin23/13 -rpath                                        
/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc -rpath /opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current                                             
ld: unknown options: --version                                                                                                                         
collect2: error: ld returned 1 exit status                         

There are some related issues like:
sagemath/sage#36342
mesonbuild/meson#12282

It seems to be caused by an incompability with the latest CLI tools.
Supposedly it is fixable by introducing export LDFLAGS="$LDFLAGS -Wl,-ld_classic"
But I couldn't get that to work (quite new to this), setting it in env or in packages/scipy/meta.yaml

Expected behavior

scipy builds

Environment

• Pyodide Version master
• Any other relevant information:
  On commit: 1849625
  OS: Sonoma 14.0

[ryanking13]

Thanks for the report @ksjogo! I think we need to change the gfortran linker to not point to the native ld but to point ld wrapper. I'll see if I can fix this.