meson: simplify use of the common-main library

The "common-main.c" file is used by multiple executables. In order to
make it easy to set it up we have created a separate library that these
executables can link against. All of these executables also want to link
against `libgit.a` though, which makes it necessary to specify both of
these as dependencies for every executable.

Simplify this a bit by declaring the library as a source dependency:
instead of creating a static library, we now instead compile the common
set of files into each executable separately.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

meson.build

@@ -1604,15 +1604,14 @@ if host_machine.system() == 'windows'
     error('Unsupported compiler ' + compiler.get_id())
   endif
 endif
-common_main_library = static_library('common-main',
-  sources: common_main_sources,
-  c_args: libgit_c_args,
-  dependencies: libgit_dependencies,
-  include_directories: libgit_include_directories,
-)
-common_main = declare_dependency(
-  link_with: common_main_library,
+
+libgit_commonmain = declare_dependency(
+  link_with: static_library('common-main',
+    sources: common_main_sources,
+    dependencies: [ libgit ],
+  ),
   link_args: common_main_link_args,
+  dependencies: [ libgit ],
 )
 
 bin_wrappers = [ ]
@@ -1620,7 +1619,7 @@ test_dependencies = [ ]
 
 git = executable('git',
   sources: builtin_sources + 'git.c',
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
   install: true,
   install_dir: get_option('libexecdir') / 'git-core',
 )
@@ -1628,35 +1627,35 @@ bin_wrappers += git
 
 test_dependencies += executable('git-daemon',
   sources: 'daemon.c',
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
   install: true,
   install_dir: get_option('libexecdir') / 'git-core',
 )
 
 test_dependencies += executable('git-sh-i18n--envsubst',
   sources: 'sh-i18n--envsubst.c',
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
   install: true,
   install_dir: get_option('libexecdir') / 'git-core',
 )
 
 bin_wrappers += executable('git-shell',
   sources: 'shell.c',
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
   install: true,
   install_dir: get_option('libexecdir') / 'git-core',
 )
 
 test_dependencies += executable('git-http-backend',
   sources: 'http-backend.c',
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
   install: true,
   install_dir: get_option('libexecdir') / 'git-core',
 )
 
 bin_wrappers += executable('scalar',
   sources: 'scalar.c',
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
   install: true,
   install_dir: get_option('libexecdir') / 'git-core',
 )
@@ -1669,7 +1668,7 @@ if get_option('curl').enabled()
 
   git_remote_http = executable('git-remote-http',
     sources: curl_sources + 'remote-curl.c',
-    dependencies: [libgit, common_main],
+    dependencies: [libgit_commonmain],
     install: true,
     install_dir: get_option('libexecdir') / 'git-core',
   )
@@ -1677,7 +1676,7 @@ if get_option('curl').enabled()
 
   test_dependencies += executable('git-http-fetch',
     sources: curl_sources + 'http-fetch.c',
-    dependencies: [libgit, common_main],
+    dependencies: [libgit_commonmain],
     install: true,
     install_dir: get_option('libexecdir') / 'git-core',
   )
@@ -1685,7 +1684,7 @@ if get_option('curl').enabled()
   if expat.found()
     test_dependencies += executable('git-http-push',
       sources: curl_sources + 'http-push.c',
-      dependencies: [libgit, common_main],
+      dependencies: [libgit_commonmain],
       install: true,
       install_dir: get_option('libexecdir') / 'git-core',
     )
@@ -1694,7 +1693,7 @@ if get_option('curl').enabled()
   foreach alias : [ 'git-remote-https', 'git-remote-ftp', 'git-remote-ftps' ]
     test_dependencies += executable(alias,
       objects: git_remote_http.extract_all_objects(recursive: false),
-      dependencies: [libgit, common_main],
+      dependencies: [libgit_commonmain],
     )
 
     install_symlink(alias + executable_suffix,
@@ -1711,7 +1710,7 @@ endif
 
 test_dependencies += executable('git-imap-send',
   sources: imap_send_sources,
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
   install: true,
   install_dir: get_option('libexecdir') / 'git-core',
 )
@@ -1719,7 +1718,7 @@ test_dependencies += executable('git-imap-send',
 foreach alias : [ 'git-receive-pack', 'git-upload-archive', 'git-upload-pack' ]
   bin_wrappers += executable(alias,
     objects: git.extract_all_objects(recursive: false),
-    dependencies: [libgit, common_main],
+    dependencies: [libgit_commonmain],
   )
 
   install_symlink(alias + executable_suffix,

oss-fuzz/meson.build

@@ -15,6 +15,6 @@ foreach fuzz_program : fuzz_programs
       'dummy-cmd-main.c',
       fuzz_program,
     ],
-    dependencies: [libgit, common_main],
+    dependencies: [libgit_commonmain],
   )
 endforeach

t/helper/meson.build

@@ -79,14 +79,14 @@ test_tool_sources = [
 
 test_tool = executable('test-tool',
   sources: test_tool_sources,
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
 )
 bin_wrappers += test_tool
 test_dependencies += test_tool
 
 test_fake_ssh = executable('test-fake-ssh',
   sources: 'test-fake-ssh.c',
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
 )
 bin_wrappers += test_fake_ssh
 test_dependencies += test_fake_ssh

t/meson.build

@@ -39,7 +39,7 @@ clar_sources += custom_target(
 
 clar_unit_tests = executable('unit-tests',
   sources: clar_sources + clar_test_suites,
-  dependencies: [libgit, common_main],
+  dependencies: [libgit_commonmain],
 )
 test('unit-tests', clar_unit_tests)
 
@@ -72,7 +72,7 @@ foreach unit_test_program : unit_test_programs
       'unit-tests/lib-reftable.c',
       unit_test_program,
     ],
-    dependencies: [libgit, common_main],
+    dependencies: [libgit_commonmain],
   )
   test(unit_test_name, unit_test,
     workdir: meson.current_source_dir(),