MAINT,TMP: Hacky replacement to be meson friendly

Generates a file by overriding printf, done globally since some of the
functions call out to other files.

getarch.c

@@ -78,7 +78,20 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endif
 
 #include <stdio.h>
+#include <stdarg.h>
 #include <string.h>
+FILE *output_stream = NULL;
+int custom_printf(const char *format, ...) {
+    va_list args;
+    va_start(args, format);
+    int ret = vfprintf(output_stream, format, args);
+    va_end(args);
+    return ret;
+}
+
+// Redefine printf to custom_printf
+#define printf custom_printf
+
 #ifdef OS_WINDOWS
 #include <windows.h>
 #endif
@@ -1900,6 +1913,18 @@ static int get_num_cores(void) {
 }
 
 int main(int argc, char *argv[]){
+    char resp = argv[1][0];
+    if (argc > 1 && resp == '3') {
+        output_stream = fopen("config.h", "w");
+        if (!output_stream) {
+            perror("Failed to open config.h for writing");
+            return 1;
+        }
+        // Always generate config.h
+        resp = '1';
+    } else {
+        output_stream = stdout;
+    }
 
 #ifdef FORCE
   char buffer[8192], *p, *q;
@@ -1908,7 +1933,7 @@ int main(int argc, char *argv[]){
 
   if (argc == 1) return 0;
 
-  switch (argv[1][0]) {
+  switch (resp) {
 
   case '0' : /* for Makefile */
 
@@ -2075,7 +2100,11 @@ printf("ELF_VERSION=2\n");
     break;
   }
 
-  fflush(stdout);
+  fflush(output_stream);
+    // Close the file if it was opened
+    if (output_stream != stdout) {
+        fclose(output_stream);
+    }
 
   return 0;
 }

meson.build

@@ -22,12 +22,6 @@ openblas_version = f'@openblas_major_version@.@openblas_minor_version@.@openblas
 # Skip the check for valid CC
 cc = meson.get_compiler('c')
 
-# Makefile.system
-# Ignoring all the hostarch checks and conflits for arch in BSD for now
-_inc = include_directories('.')
-# subdir('lapack-netlib')
-subdir('interface')
-
 # System configuration
 build_single = get_option('build_single')
 build_double = get_option('build_double')
@@ -57,7 +51,33 @@ else
     no_affinity = false
 endif
 
-# Example for handling options:
-if build_without_lapack
-    # configure build to exclude LAPACK and LAPACKE
-endif
+# Makefile.prebuild stuff
+# TODO: Handle cpuidemu, and the target falgs
+getarch = executable('getarch',
+          ['getarch.c', 'cpuid.S'])
+getarch_two = executable('getarch_2nd',
+                         ['getarch_2nd.c'])
+config_h = custom_target('gen_config_h',
+                          # input: ['getarch.c'],
+                          output: ['config.h'],
+                          command: [getarch, '3']
+                          )
+
+# run_target('generate_config_h',
+#            command: [meson.current_build_dir() + '/getarch', '1'],
+#            depends: getarch)
+
+# gch = run_command(meson.current_build_dir() + '/getarch', '1')
+# outp = gch.stdout().strip()
+
+# conf_data = configuration_data()
+# configure_file(input : meson.current_build_dir() + '/config.h',
+#   output : 'config.h',
+#   configuration : conf_data)
+
+# Makefile.system
+# Ignoring all the hostarch checks and conflicts for arch in BSD for now
+_inc = include_directories('.')
+# subdir('lapack-netlib')
+subdir('interface')
+# subdir('kernel')