pkg-config: support for `-l:libfoo.a`

fixs: #9000 Meson not correctly process with -l:xxx.a link arguments in pkgconfig .pc file.

see also:https://stackoverflow.com/questions/48532868/gcc-library-option-with-a-colon-llibevent-a

with unit test, unit test will be partially skiped if pkg-config version < 0.28 .
    see: https://gitlab.freedesktop.org/pkg-config/pkg-config/-/blob/master/NEWS

mesonbuild/dependencies/pkgconfig.py

@@ -276,6 +276,30 @@ class PkgConfigDependency(ExternalDependency):
             elif lib.startswith('-L'):
                 # We already handled library paths above
                 continue
+            elif lib.startswith('-l:'):
+                # see: https://stackoverflow.com/questions/48532868/gcc-library-option-with-a-colon-llibevent-a
+                # also : See the documentation of -lnamespec | --library=namespec in the linker manual  
+                #                     https://sourceware.org/binutils/docs-2.18/ld/Options.html
+                
+                # Don't resolve the same -l:libfoo.a argument again
+                if lib in libs_found:
+                    continue
+                libfilename = lib[3:]
+                foundname = None
+                for libdir in libpaths:
+                    target = os.path.join(libdir, libfilename)
+                    if os.path.exists(target):
+                        foundname = target
+                        break
+                if foundname is None:
+                    if lib in libs_notfound:
+                        continue
+                    else:
+                        mlog.warning('Library {!r} not found for dependency {!r}, may '
+                                    'not be successfully linked'.format(libfilename, self.name))
+                    libs_notfound.append(lib)
+                else:
+                    lib = foundname
             elif lib.startswith('-l'):
                 # Don't resolve the same -lfoo argument again
                 if lib in libs_found:

test cases/unit/97 link full name/.gitignore

@@ -0,0 +1,5 @@
+*.a
+*.o
+a.out
+libtestprovider.a
+build

test cases/unit/97 link full name/libtestprovider/meson.build

@@ -0,0 +1,20 @@
+project('libtestprovider','c')
+
+libtestprovider=static_library('testprovider',
+    files('./provider.c'),
+    install:true,
+    c_args:['-Wall','-Werror'],
+)
+
+pkg = import('pkgconfig')
+
+
+pkg.generate(
+        name:'testprovider',
+        filebase:'libtestprovider',
+        description: 'fortest',
+        requires: [],
+        libraries_private: ['-Wl,--whole-archive'] +
+            ['-L${libdir}','-l:libtestprovider.a']+
+            ['-Wl,--no-whole-archive'] 
+)

test cases/unit/97 link full name/libtestprovider/provider.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+static int g_checked = 0;
+
+static void __attribute__((constructor(101), used)) init_checked(void) {
+    g_checked=100;
+    fprintf(stdout, "inited\n");
+}
+
+
+int get_checked(void) {
+    return g_checked;
+}

test cases/unit/97 link full name/proguser/meson.build

@@ -0,0 +1,11 @@
+project('testprovider','c')
+
+deplib = dependency('libtestprovider', static:true)
+
+dprovidertest = executable('dprovidertest',
+    files('./receiver.c'),
+    dependencies:[deplib],
+    c_args:['-Wall','-Werror'],
+)
+
+test('testprovider',dprovidertest)

test cases/unit/97 link full name/proguser/receiver.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+int  __attribute__((weak)) get_checked(void) {
+    return -1;
+}
+
+
+#define CHECK_VALUE (100)
+#define TEST_SUCCESS (0)
+#define TEST_FAILTURE (-1)
+
+int main(void) {
+    if (get_checked() == CHECK_VALUE) {
+        fprintf(stdout,"good\n");
+        return TEST_SUCCESS;
+    }
+    fprintf(stdout,"bad\n");
+    return TEST_FAILTURE;
+}
+

unittests/linuxliketests.py

@@ -1297,6 +1297,49 @@ class LinuxlikeTests(BasePlatformTests):
             out = self._run(['otool', '-L', f])
             # Ensure that the otool output does not contain self.installdir
             self.assertNotRegex(out, self.installdir + '.*dylib ')
+    
+    @skipIfNoPkgconfig
+    def test_link_arg_fullname(self):
+        '''
+        Test for  support of -l:libfullname.a
+        see: https://github.com/mesonbuild/meson/issues/9000
+             https://stackoverflow.com/questions/48532868/gcc-library-option-with-a-colon-llibevent-a
+        '''
+        testdir = os.path.join(self.unit_test_dir, '97 link full name','libtestprovider')
+        oldprefix = self.prefix
+        # install into installdir without using DESTDIR
+        installdir = self.installdir
+        self.prefix = installdir
+        self.init(testdir)
+        self.prefix=oldprefix
+        self.build()
+        self.install(use_destdir=False)
+
+        self.new_builddir()
+        env = {'LIBRARY_PATH': os.path.join(installdir, self.libdir),
+               'PKG_CONFIG_PATH': os.path.join(installdir, self.libdir, 'pkgconfig')}
+        testdir = os.path.join(self.unit_test_dir, '97 link full name','proguser')
+        self.init(testdir,override_envvars=env)
+        
+        # test for link with full path
+        with open(os.path.join(self.builddir, 'build.ninja'), encoding='utf-8') as bfile:
+            for line in bfile:
+                if 'build dprovidertest:' in line:
+                    self.assertIn('/libtestprovider.a', line)
+                    
+        if is_osx():
+            # macOS's ld do not supports `--whole-archive`, skip build & run
+            return
+        
+        self.build(override_envvars=env)
+        
+        # skip test if pkg-config is too old.
+        #   before v0.28, Libs flags like -Wl will not kept in context order with -l flags.
+        #   see https://gitlab.freedesktop.org/pkg-config/pkg-config/-/blob/master/NEWS
+        pkgconfigver = subprocess.check_output(['pkg-config', '--version'])
+        if b'0.28' > pkgconfigver:
+            raise SkipTest('pkg-config is too old to be correctly done this.')
+        self.run_tests()
 
     @skipIfNoPkgconfig
     def test_usage_pkgconfig_prefixes(self):