Avoid checking for tools and options that won't be used

With many components disabled, configuration checked for many programs and
compiler flags that weren't actually used for anything.  This is slow, and
makes simple builds look a lot more complicated than they are.  So, rework
things to only check for tools and flags that will actually be used.

Mainly this is to make the package nice to use as a subproject.

1 files changed, 160 insertions, 4 deletions

diff --git a/test/meson.build b/test/meson.build
index c4a483d..7144349 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -68,6 +68,163 @@ if get_option('lint')
   endif
 endif
 
+#############################
+# Compilers and Build Tools #
+#############################
+
+cc = meson.get_compiler('c')
+
+if add_languages(['cpp'], native: false, required: get_option('tests'))
+  cpp = meson.get_compiler('cpp')
+endif
+
+########################
+# Warning Suppressions #
+########################
+
+warning_level = get_option('warning_level')
+
+# C
+test_c_suppressions = []
+if cc.get_id() in ['clang', 'emscripten']
+  if warning_level == 'everything'
+    test_c_suppressions += [
+      '-Wno-cast-align',
+      '-Wno-cast-qual',
+      '-Wno-declaration-after-statement',
+      '-Wno-documentation-unknown-command',
+      '-Wno-double-promotion',
+      '-Wno-float-equal',
+      '-Wno-padded',
+      '-Wno-reserved-id-macro',
+      '-Wno-unsafe-buffer-usage',
+    ]
+
+    if not meson.is_cross_build()
+      test_c_suppressions += ['-Wno-poison-system-directories']
+    endif
+
+    if host_machine.system() == 'windows'
+      test_c_suppressions += ['-Wno-format-nonliteral']
+    endif
+  endif
+
+  if warning_level in ['everything', '3', '2']
+    test_c_suppressions += ['-Wno-unused-parameter']
+  endif
+
+elif cc.get_id() == 'gcc'
+  if warning_level == 'everything'
+    test_c_suppressions += [
+      '-Wno-cast-align',
+      '-Wno-cast-qual',
+      '-Wno-double-promotion',
+      '-Wno-float-equal',
+      '-Wno-inline',
+      '-Wno-padded',
+      '-Wno-suggest-attribute=const',
+      '-Wno-suggest-attribute=malloc',
+      '-Wno-suggest-attribute=pure',
+      '-Wno-unsuffixed-float-constants',
+      '-Wno-unused-const-variable',
+    ]
+
+    if target_machine.system() == 'windows'
+      test_c_suppressions += [
+        '-Wno-sign-conversion',
+        '-Wno-suggest-attribute=format',
+      ]
+    endif
+  endif
+
+  if warning_level in ['everything', '3', '2']
+    test_c_suppressions += ['-Wno-unused-parameter']
+  endif
+
+elif cc.get_id() == 'msvc'
+  if warning_level == 'everything'
+    test_c_suppressions += [
+      '/wd4061', # enumerator in switch is not explicitly handled
+      '/wd4244', # conversion with possible loss of data
+      '/wd4365', # signed/unsigned mismatch
+      '/wd4514', # unreferenced inline function has been removed
+      '/wd4710', # function not inlined
+      '/wd4711', # function selected for automatic inline expansion
+      '/wd4820', # padding added after construct
+      '/wd5045', # will insert Spectre mitigation for memory load
+    ]
+  endif
+
+  if warning_level in ['everything', '3']
+    test_c_suppressions += [
+      '/wd4100', # unreferenced formal parameter
+    ]
+  endif
+
+  if warning_level in ['everything', '3', '2']
+    test_c_suppressions += [
+      '/wd4267', # conversion from size_t to a smaller type
+    ]
+  endif
+endif
+
+test_c_suppressions = cc.get_supported_arguments(test_c_suppressions)
+
+# C++
+if is_variable('cpp')
+  test_cpp_suppressions = []
+
+  if warning_level == 'everything'
+    if cpp.get_id() in ['clang', 'emscripten']
+      test_cpp_suppressions += [
+        '-Wno-c++98-compat',
+        '-Wno-cast-align',
+        '-Wno-cast-qual',
+        '-Wno-documentation-unknown-command',
+        '-Wno-nullability-extension',
+        '-Wno-padded',
+        '-Wno-reserved-id-macro',
+        '-Wno-unsafe-buffer-usage',
+      ]
+
+      if not meson.is_cross_build()
+        test_cpp_suppressions += ['-Wno-poison-system-directories']
+      endif
+
+      if host_machine.system() == 'windows'
+        test_cpp_suppressions += ['-Wno-format-nonliteral']
+      endif
+
+    elif cpp.get_id() == 'gcc'
+      test_cpp_suppressions += [
+        '-Wno-cast-align',
+        '-Wno-cast-qual',
+        '-Wno-inline',
+        '-Wno-padded',
+        '-Wno-unused-const-variable',
+        '-Wno-useless-cast',
+      ]
+
+      if target_machine.system() == 'windows'
+        test_cpp_suppressions += ['-Wno-suggest-attribute=format']
+      endif
+
+    elif cpp.get_id() == 'msvc'
+      test_cpp_suppressions += [
+        '/wd4514', # unreferenced inline function has been removed
+        '/wd4706', # assignment within conditional expression
+        '/wd4710', # function not inlined
+        '/wd4711', # function selected for automatic inline expansion
+        '/wd4820', # padding added after data member
+        '/wd5045', # will insert Spectre mitigation
+        '/wd5264', # const variable is not used
+      ]
+    endif
+  endif
+
+  test_cpp_suppressions = cpp.get_supported_arguments(test_cpp_suppressions)
+endif
+
 ########
 # Code #
 ########
@@ -78,7 +235,7 @@ test(
   executable(
     'test_build_c',
     files('test_build.c'),
-    c_args: c_suppressions,
+    c_args: test_c_suppressions,
     dependencies: [lv2_dep],
     implicit_include_directories: false,
   ),
@@ -92,7 +249,7 @@ if is_variable('cpp')
     executable(
       'test_build_cpp',
       files('cpp/test_build.cpp'),
-      cpp_args: cpp_suppressions,
+      cpp_args: test_cpp_suppressions,
       dependencies: [lv2_dep],
       implicit_include_directories: false,
     ),
@@ -131,7 +288,6 @@ if get_option('lint')
   # Check scripts for errors with pylint
   pylint = find_program('pylint', required: get_option('tests'))
   if pylint.found()
-    pymod = import('python')
     lint_py = pymod.find_installation(
       'python3',
       modules: ['pygments', 'rdflib'],
@@ -171,7 +327,7 @@ foreach test_name : test_names
     executable(
       test_name,
       files('test_@0@.c'.format(test_name)),
-      c_args: c_suppressions + atom_test_suppressions,
+      c_args: test_c_suppressions + atom_test_suppressions,
       dependencies: [lv2_dep],
       implicit_include_directories: false,
     ),