meson: we can now build libexpr!

Change-Id: I937a217fdcb5bd33491cc20f04a734e9d732d5e5

meson.build

@@ -191,6 +191,9 @@ add_project_arguments(
 )
 
 subdir('src/libutil')
-# Load-bearing order. libstore depends on libutil (includes).
+# Load-bearing order. libstore depends on libutil.
 subdir('src/libstore')
+# libfetchers depends on libstore.
 subdir('src/libfetchers')
+# libexpr depends on libfetchers.
+subdir('src/libexpr')

src/libexpr/meson.build

@@ -0,0 +1,84 @@
+bison = find_program('bison')
+flex = find_program('flex')
+
+parser_tab = custom_target(
+  input : 'parser.y',
+  output : [
+    'parser-tab.cc',
+    'parser-tab.hh',
+  ],
+  command : [
+    'bison',
+    '-v',
+    '-o',
+    '@OUTPUT0@',
+    '@INPUT@',
+    '-d',
+  ],
+)
+
+lexer_tab = custom_target(
+  input : [
+    'lexer.l',
+    parser_tab,
+  ],
+  output : [
+    'lexer-tab.cc',
+    'lexer-tab.hh',
+  ],
+  command : [
+    'flex',
+    '--outfile',
+    '@OUTPUT0@',
+    '--header-file=' + '@OUTPUT1@',
+    '@INPUT0@',
+  ],
+)
+
+libexpr_sources = files(
+  'attr-path.cc',
+  'attr-set.cc',
+  'eval-cache.cc',
+  'eval-error.cc',
+  'eval-settings.cc',
+  'eval.cc',
+  'function-trace.cc',
+  'get-drvs.cc',
+  'json-to-value.cc',
+  'nixexpr.cc',
+  'paths.cc',
+  'primops.cc',
+  'print-ambiguous.cc',
+  'print.cc',
+  'search-path.cc',
+  'value-to-json.cc',
+  'value-to-xml.cc',
+  'flake/config.cc',
+  'flake/flake.cc',
+  'flake/flakeref.cc',
+  'flake/lockfile.cc',
+  'primops/context.cc',
+  'primops/fetchClosure.cc',
+  'primops/fetchMercurial.cc',
+  'primops/fetchTree.cc',
+  'primops/fromTOML.cc',
+  'value/context.cc',
+)
+
+all_sources += {
+  'libexpr': libexpr_sources
+}
+
+libexpr = library(
+  'nixexpr',
+  libexpr_sources,
+  parser_tab,
+  lexer_tab,
+  dependencies : [
+    liblixutil,
+    liblixstore,
+    liblixfetchers,
+    boehm,
+    boost,
+  ],
+)

src/libfetchers/meson.build

@@ -13,7 +13,7 @@ libfetchers_sources = files(
   'tarball.cc',
 )
 
-library(
+libfetchers = library(
   'nixfetchers',
   libfetchers_sources,
   dependencies : [
@@ -21,3 +21,8 @@ library(
     liblixutil,
   ],
 )
+
+liblixfetchers = declare_dependency(
+  include_directories : include_directories('.'),
+  link_with : libfetchers,
+)

src/libstore/meson.build

@@ -1,21 +1,25 @@
-find_program('lsof')
-
-# Yes this is really what it does.
-# FIXME: do we. really need to rely on the shell for this?
-gen_script = '''
-  echo 'R"foo(' >> @OUTPUT@.tmp &&
-  cat < @INPUT@ >> @OUTPUT@.tmp &&
-  echo ')foo"' >> @OUTPUT@.tmp &&
-  mv @OUTPUT@.tmp @OUTPUT
-'''.replace('\n', ' ')
+bash = find_program('bash')
 
 schema_sql_gen = custom_target(
   input : 'schema.sql',
   output : 'schema.sql.gen.hh',
   command : [
-    'bash', '-c',
-    gen_script,
+    bash,
+    '-c',
+    'echo \'R"foo(\' | cat - @INPUT@ && echo \')foo"\'',
   ],
+  capture : true,
+)
+
+ca_specific_schema = custom_target(
+  input : 'ca-specific-schema.sql',
+  output : 'ca-specific-schema.sql.gen.hh',
+  command : [
+    bash,
+    '-c',
+    'echo \'R"foo(\' | cat - @INPUT@ && echo \')foo"\'',
+  ],
+  capture : true,
 )
 
 libstore_sources = files(
@@ -87,8 +91,8 @@ all_sources += {
 }
 
 cpp_str_defines = {
-  'NIX_PREFIX': get_option('prefix'),
   'LSOF': lsof.full_path(),
+  'NIX_PREFIX':    get_option('prefix'),
   'NIX_STORE_DIR': get_option('store-dir'),
   'NIX_DATA_DIR':  get_option('prefix') / 'share', # FIXME: make separately-configurable
   'NIX_STATE_DIR': get_option('prefix') / 'nix', # FIXME: same
@@ -108,8 +112,9 @@ endforeach
 
 libstore = library(
   'nixstore',
-  libstore_sources,
   schema_sql_gen,
+  ca_specific_schema,
+  libstore_sources,
   dependencies : [
     libarchive,
     liblixutil, # Internal.