macOS: more generic search for Homebrew Liquid-dsp

Now we query homebrew itself as to where liquid might be installed.

CHANGES.md

@@ -1,5 +1,10 @@
 # redsea changelog
 
+## HEAD
+
+* Fixes:
+  * macOS: ask Homebrew about liquid-dsp installation path instead of hardcoding it
+
 ## 1.0.1
 
 * Fixes:

meson.build

@@ -1,53 +1,54 @@
-project('redsea', 'cpp', default_options : ['warning_level=3', 'buildtype=release', 'optimization=3'],
-        version: '1.0.1')
+project(
+  'redsea',
+  'cpp',
+  default_options: ['warning_level=3', 'buildtype=release', 'optimization=3'],
+  version: '1.0.2-SNAPSHOT',
+)
 
 # Store version number to be compiled in
 conf = configuration_data()
 conf.set_quoted('VERSION', meson.project_version())
-configure_file(output : 'config.h',
-               configuration : conf)
-
+configure_file(output: 'config.h', configuration: conf)
 
 ########################
 ### Compiler options ###
 ########################
 
-
 cc = meson.get_compiler('cpp')
-add_project_arguments(cc.get_supported_arguments([
-    '-Wno-unknown-pragmas']), language: 'cpp')
+add_project_arguments(cc.get_supported_arguments(['-Wno-unknown-pragmas']), language: 'cpp')
 
 # We want to use M_PI on Windows
 if build_machine.system() == 'windows'
-  add_project_arguments('-D_USE_MATH_DEFINES=1', language : 'cpp')
+  add_project_arguments('-D_USE_MATH_DEFINES=1', language: 'cpp')
 endif
 
 # Explicit GNU extensions on Cygwin
 if build_machine.system() == 'cygwin'
-  add_project_arguments('-std=gnu++14', language : 'cpp')
+  add_project_arguments('-std=gnu++14', language: 'cpp')
 else
-  add_project_arguments('-std=c++14', language : 'cpp')
+  add_project_arguments('-std=c++14', language: 'cpp')
 endif
 
-
 ####################
 ### Dependencies ###
 ####################
 
-
 # Find libsndfile
 sndfile = dependency('sndfile')
 
 # Find nlohmann's json
-json = dependency('nlohmann_json', version : '>=3.9.0')
+json = dependency('nlohmann_json', version: '>=3.9.0')
 
 # Find iconv; may require -liconv
-foreach linker_args : [ ['-liconv'], [] ]
-  if cc.links('''
+foreach linker_args : [['-liconv'], []]
+  if cc.links(
+    '''
     #include <iconv.h>
     int main() {
       iconv_open("UTF-8", "ISO-8859-1");
-    }''', args: linker_args)
+    }''',
+    args: linker_args,
+  )
     iconv = declare_dependency(link_args: linker_args)
     break
   endif
@@ -58,36 +59,33 @@ if not iconv.found()
 endif
 
 # Find liquid-dsp
-if build_machine.system() == 'darwin'
+liquid = cc.find_library('liquid', required: false)
+# macOS: The above mechanism sometimes fails, so let's look deeper
+if not liquid.found() and build_machine.system() == 'darwin'
   fs = import('fs')
-  # Homebrew system
-  if fs.is_dir('/opt/homebrew/lib')
-    liquid_lib = cc.find_library('liquid',
-                 dirs : ['/opt/homebrew/lib'])
-    liquid_inc = include_directories('/opt/homebrew/include')
-  # MacPorts system
-  else
-    liquid_lib = cc.find_library('liquid',
-                 dirs : ['/opt/local/lib'])
+  brew = find_program('brew', required: false)
+  if brew.found()
+    # Homebrew system
+    liquid_prefix = run_command(brew, '--prefix', 'liquid-dsp', check: true).stdout().strip()
+    liquid_lib = cc.find_library('liquid', dirs: [liquid_prefix + '/lib'])
+    liquid_inc = include_directories(liquid_prefix + '/include')
+    liquid = declare_dependency(dependencies: liquid_lib, include_directories: liquid_inc)
+  elif fs.is_dir('/opt/local/lib')
+    # MacPorts system
+    liquid_lib = cc.find_library('liquid', dirs: ['/opt/local/lib'])
     liquid_inc = include_directories('/opt/local/include')
+    liquid = declare_dependency(dependencies: liquid_lib, include_directories: liquid_inc)
   endif
-  liquid = declare_dependency(dependencies : liquid_lib,
-                              include_directories : liquid_inc)
-else
-  liquid = cc.find_library('liquid')
 endif
-if cc.has_function('modemcf_create',
-   prefix : '#include <liquid/liquid.h>',
-   dependencies : liquid)
-  add_project_arguments('-DMODEM_IS_MODEMCF', language : 'cpp')
+# API for modem/modemcf changed recently, but we can deal with either
+if liquid.found() and cc.has_function('modemcf_create', prefix: '#include <liquid/liquid.h>', dependencies: liquid)
+  add_project_arguments('-DMODEM_IS_MODEMCF', language: 'cpp')
 endif
 
-
 ############################
 ### Sources & Executable ###
 ############################
 
-
 sources_no_main = [
   'src/block_sync.cc',
   'src/channel.cc',
@@ -101,12 +99,15 @@ sources_no_main = [
   'src/tmc/csv.cc',
   'src/tmc/tmc.cc',
   'src/tmc/locationdb.cc',
-  'src/util.cc'
+  'src/util.cc',
 ]
 
-executable('redsea', [sources_no_main, 'src/redsea.cc'], dependencies: [iconv, json, liquid, sndfile],
-           install: true)
-
+executable(
+  'redsea',
+  [sources_no_main, 'src/redsea.cc'],
+  dependencies: [iconv, json, liquid, sndfile],
+  install: true,
+)
 
 ##################
 ### Unit tests ###
@@ -115,7 +116,10 @@ executable('redsea', [sources_no_main, 'src/redsea.cc'], dependencies: [iconv, j
 catch2 = dependency('catch2-with-main', required: false)
 
 if catch2.found()
-  test_exec = executable('redsea-test', [sources_no_main, 'test/unit.cc'],
-                         dependencies: [iconv, json, liquid, sndfile, catch2])
+  test_exec = executable(
+    'redsea-test',
+    [sources_no_main, 'test/unit.cc'],
+    dependencies: [iconv, json, liquid, sndfile, catch2],
+  )
   test('Smoke tests', test_exec)
 endif