meson: Add support for ni845x_spi on Windows

TEST=On MSYS32 MINGW32 with ni845x library installed:
     meson setup -Dprogrammer=ni845x_spi build
     meson compile -C build
     ./build/flashrom.exe lists the ni845x_spi as choice.
     Without ni845x library installed but ni845x_spi disabled,
     build succeeds on all platforms.

Change-Id: I2d32f11852ac1a5184af8e8683ca1914a6e72973
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Signed-off-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/75236
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

meson.build

@@ -12,6 +12,8 @@ project('flashromutils', 'c',
   ],
 )
 
+fs = import('fs')
+
 if get_option('classic_cli').enabled() and get_option('default_library') == 'shared'
   error('''
     Cannot build cli_classic with shared libflashrom. Use \'-Dclassic_cli=disabled\' to disable the cli,
@@ -149,6 +151,30 @@ libusb1    = dependency('libusb-1.0', required : group_usb)
 libftdi1   = dependency('libftdi1', required : group_ftdi)
 libjaylink = dependency('libjaylink', required : group_jlink, version : '>=0.3.0')
 
+if host_machine.system() == 'windows'
+  # Specifying an include_path that doesn't exist is an error,
+  # but we only use this if the library is found in the same directory.
+  ni845x_search_path = get_option('ni845x_search_path')
+  if fs.is_dir(ni845x_search_path)
+    ni845x_include_path = [ni845x_search_path]
+  else
+    ni845x_include_path = []
+  endif
+
+  libni845x = declare_dependency(
+    dependencies : [
+      cc.find_library(
+        'ni845x',
+        dirs : get_option('ni845x_search_path'),
+        required : get_option('programmer').contains('ni845x_spi')
+      ),
+    ],
+    include_directories : ni845x_include_path,
+  )
+else
+  libni845x = dependency('', required : false)
+endif
+
 subdir('platform')
 
 if systems_hwaccess.contains(host_machine.system())
@@ -369,6 +395,14 @@ programmer = {
     'flags'   : [ '-DCONFIG_MSTARDDC_SPI=1' ],
     'default' : false
   },
+  'ni845x_spi' : {
+    'systems' : [ 'windows' ],
+    'cpu_families' : [ 'x86' ], # The required ni845x library is 32-bit only
+    'deps'    : [ libni845x ],
+    'srcs'    : files('ni845x_spi.c'),
+    'flags'   : [ '-DCONFIG_NI845X_SPI=1' ],
+    'default' : false,
+  },
   'nic3com' : {
     'systems' : systems_hwaccess,
     'cpu_families' : cpus_port_io,

meson_options.txt

@@ -13,10 +13,12 @@ option('programmer', type : 'array', value : ['auto'], choices : [
         'asm106x', 'atahpt', 'atapromise', 'atavia', 'buspirate_spi', 'ch341a_spi', 'ch347_spi','dediprog',
         'developerbox_spi', 'digilent_spi', 'dirtyjtag_spi', 'drkaiser', 'dummy', 'ft2232_spi',
         'gfxnvidia', 'internal', 'it8212', 'jlink_spi', 'linux_mtd', 'linux_spi', 'mediatek_i2c_spi',
-        'mstarddc_spi', 'nic3com', 'nicintel', 'nicintel_eeprom', 'nicintel_spi', 'nicnatsemi',
+        'mstarddc_spi', 'ni845x_spi', 'nic3com', 'nicintel', 'nicintel_eeprom', 'nicintel_spi', 'nicnatsemi',
         'nicrealtek', 'ogp_spi', 'parade_lspcon', 'pickit2_spi', 'pony_spi', 'raiden_debug_spi',
         'rayer_spi', 'realtek_mst_i2c_spi', 'satamv', 'satasii', 'serprog',  'stlinkv3_spi', 'usbblaster_spi',
 ], description: 'Active programmers')
 option('llvm_cov', type : 'feature', value : 'disabled', description : 'build for llvm code coverage')
 option('man-pages', type : 'feature', value : 'auto', description : 'build the man-page for classic_cli')
 option('documentation', type : 'feature', value : 'auto', description : 'build the html documentation')
+option('ni845x_search_path', type : 'string', value : 'C:\Program Files (x86)\National Instruments\Ni-845x\MS Visual C',
+       description : 'Path to search for the proprietary ni845x library and header (32-bit Windows only)')

ni845x_spi.c

@@ -15,6 +15,13 @@
  *
  */
 
+/* The ni845x header does need the WIN32 symbol to be defined and meson does not do it.
+ * Define it just here, since this driver will only work on 32-bit Windows.
+ */
+#ifndef WIN32
+#define WIN32
+#endif
+
 #include <ctype.h>
 #include <inttypes.h>
 #include <string.h>