Merge pull request #3122 from eli-schwartz/betterlinkage

meson: for internal linkage, link to both libzstd and a static copy of it

build/meson/lib/meson.build

@@ -126,6 +126,35 @@ libzstd = library('zstd',
 libzstd_dep = declare_dependency(link_with: libzstd,
   include_directories: libzstd_includes)
 
+# we link to both:
+# - the shared library (for public symbols)
+# - the static library (for private symbols)
+#
+# this is needed because internally private symbols are used all the time, and
+# -fvisibility=hidden means those cannot be found
+if get_option('default_library') == 'static'
+  libzstd_static = libzstd
+  libzstd_internal_dep = libzstd_dep
+else
+  if get_option('default_library') == 'shared'
+    libzstd_static = static_library('zstd_objlib',
+      objects: libzstd.extract_all_objects(recursive: true),
+      build_by_default: false)
+  else
+    libzstd_static = libzstd.get_static_lib()
+  endif
+
+  if cc_id == compiler_msvc
+    # msvc does not actually support linking to both, but errors out with:
+    #   error LNK2005: ZSTD_<foo> already defined in zstd.lib(zstd-1.dll)
+    libzstd_internal_dep = declare_dependency(link_with: libzstd_static)
+  else
+    libzstd_internal_dep = declare_dependency(link_with: libzstd,
+      # the static library must be linked after the shared one
+      dependencies: declare_dependency(link_with: libzstd_static))
+  endif
+endif
+
 pkgconfig.generate(libzstd,
   name: 'libzstd',
   filebase: 'libzstd',

build/meson/programs/meson.build

@@ -19,17 +19,12 @@ zstd_programs_sources = [join_paths(zstd_rootdir, 'programs/zstdcli.c'),
   join_paths(zstd_rootdir, 'programs/benchzstd.c'),
   join_paths(zstd_rootdir, 'programs/datagen.c'),
   join_paths(zstd_rootdir, 'programs/dibio.c'),
-  join_paths(zstd_rootdir, 'programs/zstdcli_trace.c'),
+  join_paths(zstd_rootdir, 'programs/zstdcli_trace.c')]
-  # needed due to use of private symbol + -fvisibility=hidden
-  join_paths(zstd_rootdir, 'lib/common/xxhash.c'),
-  join_paths(zstd_rootdir, 'lib/common/pool.c'),
-  join_paths(zstd_rootdir, 'lib/common/zstd_common.c'),
-  join_paths(zstd_rootdir, 'lib/common/error_private.c')]
 
-zstd_deps = [ libzstd_dep ]
+zstd_deps = [ libzstd_internal_dep ]
 zstd_c_args = libzstd_debug_cflags
 
-zstd_frugal_deps = [ libzstd_dep ]
+zstd_frugal_deps = [ libzstd_internal_dep ]
 zstd_frugal_c_args = [ '-DZSTD_NOBENCH', '-DZSTD_NODICT', '-DZSTD_NOTRACE' ]
 
 if use_multi_thread
@@ -82,10 +77,7 @@ zstd_frugal_sources = [join_paths(zstd_rootdir, 'programs/zstdcli.c'),
   join_paths(zstd_rootdir, 'programs/timefn.c'),
   join_paths(zstd_rootdir, 'programs/util.c'),
   join_paths(zstd_rootdir, 'programs/fileio.c'),
-  join_paths(zstd_rootdir, 'programs/fileio_asyncio.c'),
+  join_paths(zstd_rootdir, 'programs/fileio_asyncio.c')]
-  join_paths(zstd_rootdir, 'lib/common/pool.c'),
-  join_paths(zstd_rootdir, 'lib/common/zstd_common.c'),
-  join_paths(zstd_rootdir, 'lib/common/error_private.c')]
 
 # Minimal target, with only zstd compression and decompression.
 # No bench. No legacy.

build/meson/tests/meson.build

@@ -38,7 +38,7 @@ testcommon_sources = [join_paths(zstd_rootdir, 'programs/datagen.c'),
 testcommon = static_library('testcommon',
   testcommon_sources,
   # needed due to use of private symbol + -fvisibility=hidden
-  objects: libzstd.extract_all_objects(recursive: false))
+  link_with: libzstd_static)
 
 testcommon_dep = declare_dependency(link_with: testcommon,
   dependencies: libzstd_deps,
@@ -116,11 +116,7 @@ decodecorpus = executable('decodecorpus',
   dependencies: [ testcommon_dep, libm_dep ],
   install: false)
 
-poolTests_sources = [join_paths(zstd_rootdir, 'tests/poolTests.c'),
+poolTests_sources = [join_paths(zstd_rootdir, 'tests/poolTests.c')]
-  join_paths(zstd_rootdir, 'lib/common/pool.c'),
-  join_paths(zstd_rootdir, 'lib/common/threading.c'),
-  join_paths(zstd_rootdir, 'lib/common/zstd_common.c'),
-  join_paths(zstd_rootdir, 'lib/common/error_private.c')]
 poolTests = executable('poolTests',
   poolTests_sources,
   include_directories: test_includes,