BLD: Try working on building the interface

With inputs from @eli-schwartz

interface/meson.build

@@ -0,0 +1,20 @@
+configurations = [
+  # TODO: Also add defines for DOUBLE for d and the rest
+  {'defs': [], 'name': 'imax'},  # Original, no defines
+  {'defs': ['-DUSE_ABS'], 'name': 'iamax'},
+  {'defs': ['-DUSE_ABS', '-DUSE_MIN'], 'name': 'iamin'},
+  {'defs': ['-DUSE_MIN'], 'name': 'imin'},
+]
+
+_static_libs = []
+foreach conf: configurations
+    _static_libs += static_library(
+        conf['name'],
+        'imax.c',
+        include_directories:  _inc,
+        c_args: conf['defs'],
+    )
+endforeach
+
+_interface = static_library('_interface',
+                    link_whole: _static_libs)

interface/meson_options.txt

@@ -0,0 +1,4 @@
+option('no_fblas', type: 'boolean', value: false, description: 'Disable FBLAS')
+option('build_bfloat16', type: 'boolean', value: false, description: 'Enable BFloat16 support')
+option('exprecision', type: 'boolean', value: false, description: 'Enable extended precision')
+option('quad_precision', type: 'boolean', value: false, description: 'Enable quad precision')

meson.build

@@ -24,7 +24,9 @@ cc = meson.get_compiler('c')
 
 # Makefile.system
 # Ignoring all the hostarch checks and conflits for arch in BSD for now
-subdir('lapack-netlib')
+_inc = include_directories('.')
+# subdir('lapack-netlib')
+subdir('interface')
 
 # System configuration
 build_single = get_option('build_single')