Add CPU feature detection.

Will be used for dynamically dispatching future asm functions.

1 files changed, 20 insertions, 5 deletions

diff --git a/meson.build b/meson.build
index 2e034b2..5bcfb02 100644
--- a/meson.build
+++ b/meson.build
@@ -4,6 +4,7 @@ project('libmg2d', 'c',
 add_project_arguments('-D_XOPEN_SOURCE=700', language : 'c')
 
 lib_src = [
+    'cpu.c',
     'ell_relax.c',
     'log.c',
     'mg2d.c',
@@ -17,15 +18,28 @@ dep_tp  = declare_dependency(link_args : '-lthreadpool')
 
 deps = [dep_tp]
 
-# x86 SIMD
+cdata = configuration_data()
+cdata.set10('ARCH_X86',          false)
+cdata.set10('ARCH_X86_64',       false)
+cdata.set10('HAVE_EXTERNAL_ASM', false)
+
 arch = host_machine.cpu_family()
-if arch == 'x86_64'
-    nasm = find_program('nasm', required : false)
-    if not nasm.found()
-        warning('nasm not found, no SIMD will be built')
+if arch.startswith('x86')
+    cdata.set10('ARCH_X86', true)
+
+    if arch == 'x86_64'
+        cdata.set10('ARCH_X86_64', true)
+        nasm = find_program('nasm', required : get_option('nasm'))
+        if nasm.found()
+            cdata.set10('HAVE_EXTERNAL_ASM', true)
+        else
+            warning('nasm not found, no SIMD will be built')
+        endif
     endif
 endif
 
+configure_file(output : 'config.h', output_format : 'c', configuration : cdata)
+
 if nasm.found()
     cdata_asm = configuration_data()
     cdata_asm.set10('ARCH_X86', true)
@@ -57,6 +71,7 @@ if nasm.found()
     )
 
     nasm_sources = files(
+        'cpuid.asm',
     )
 
     lib_obj += nasm_gen.process(nasm_sources)