meson: use platform/ as subdir()

Move build instructions for files inside the `platform/` directory to
`platform/meson.build`. This contains instructions to build
`memaccess.c`, the right endian implementation and selecting the right
legacy command line option for the endian.

The `platform/` directory should contain code that abstracts the
underlying platform but is not involved in flashrom logic.

Change-Id: I88044a3f903f316138483dd872a6d95f8686ae69
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/63826
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>

meson.build

@@ -115,6 +115,8 @@ srcs = files(
   'writeprotect_ranges.c',
 )
 
+subdir('platform')
+
 host_is_x86 = ['x86', 'x86_64'].contains(host_machine.cpu_family())
 
 need_serial = [
@@ -174,17 +176,6 @@ else
   add_project_arguments('-DIS_WINDOWS=0', language : 'c')
 endif
 
-srcs += 'platform/memaccess.c'
-
-if host_machine.endian() == 'little'
-  srcs += 'platform/endian_little.c'
-  add_project_arguments('-D__FLASHROM_LITTLE_ENDIAN__=1', language : 'c')
-endif
-if host_machine.endian() == 'big'
-  srcs += 'platform/endian_big.c'
-  add_project_arguments('-D__FLASHROM_BIG_ENDIAN__=1', language : 'c')
-endif
-
 # some programmers require libusb
 if get_option('usb')
   srcs += 'usbdev.c'

platform/meson.build

@@ -0,0 +1,11 @@
+srcs += files(
+  ('endian_' + host_machine.endian() + '.c'),
+  'memaccess.c',
+)
+
+if host_machine.endian() == 'little'
+  add_project_arguments('-D__FLASHROM_LITTLE_ENDIAN__=1', language : 'c')
+endif
+if host_machine.endian() == 'big'
+  add_project_arguments('-D__FLASHROM_BIG_ENDIAN__=1', language : 'c')
+endif