diff --git a/amdgpu/meson.build b/amdgpu/meson.build
index d9d7de2d..7c8ccc7e 100644
--- a/amdgpu/meson.build
+++ b/amdgpu/meson.build
@@ -31,7 +31,7 @@ libdrm_amdgpu = shared_library(
     config_file,
   ],
   c_args : [
-    warn_c_args,
+    libdrm_c_args,
     '-DAMDGPU_ASIC_ID_TABLE="@0@"'.format(join_paths(datadir_amdgpu, 'amdgpu.ids')),
   ],
   include_directories : [inc_root, inc_drm],
diff --git a/etnaviv/meson.build b/etnaviv/meson.build
index ca2aa544..515a4ed0 100644
--- a/etnaviv/meson.build
+++ b/etnaviv/meson.build
@@ -30,7 +30,7 @@ libdrm_etnaviv = shared_library(
   ],
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   dependencies : [dep_pthread_stubs, dep_rt, dep_atomic_ops],
   version : '1.0.0',
   install : true,
diff --git a/exynos/meson.build b/exynos/meson.build
index 30d36405..bdfc3fc6 100644
--- a/exynos/meson.build
+++ b/exynos/meson.build
@@ -21,7 +21,7 @@
 libdrm_exynos = shared_library(
   'drm_exynos',
   [files('exynos_drm.c', 'exynos_fimg2d.c'), config_file],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
   dependencies : [dep_pthread_stubs],
diff --git a/freedreno/meson.build b/freedreno/meson.build
index 015b7fb1..c9aba060 100644
--- a/freedreno/meson.build
+++ b/freedreno/meson.build
@@ -42,7 +42,7 @@ endif
 libdrm_freedreno = shared_library(
   'drm_freedreno',
   [files_freedreno, config_file],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_drm],
   dependencies : [dep_valgrind, dep_pthread_stubs, dep_rt, dep_atomic_ops],
   link_with : libdrm,
diff --git a/intel/meson.build b/intel/meson.build
index ff40ab91..3d6bbac6 100644
--- a/intel/meson.build
+++ b/intel/meson.build
@@ -30,7 +30,7 @@ libdrm_intel = shared_library(
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
   dependencies : [dep_pciaccess, dep_pthread_stubs, dep_rt, dep_valgrind, dep_atomic_ops],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   version : '1.0.0',
   install : true,
 )
@@ -59,7 +59,7 @@ test_decode = executable(
   files('test_decode.c'),
   include_directories : [inc_root, inc_drm],
   link_with : [libdrm, libdrm_intel],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
 )
 
 test(
diff --git a/libkms/meson.build b/libkms/meson.build
index 86d1a4ee..dc931608 100644
--- a/libkms/meson.build
+++ b/libkms/meson.build
@@ -44,7 +44,7 @@ endif
 libkms = shared_library(
   'kms',
   [files_libkms, config_file],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : libkms_include,
   link_with : libdrm,
   version : '1.0.0',
diff --git a/meson.build b/meson.build
index 75c7bdff..80d50188 100644
--- a/meson.build
+++ b/meson.build
@@ -211,6 +211,9 @@ foreach a : ['unused-parameter', 'attributes', 'long-long',
   endif
 endforeach
 
+# all c args:
+libdrm_c_args = warn_c_args + ['-fvisibility=hidden']
+
 
 dep_pciaccess = dependency('pciaccess', version : '>= 0.10', required : with_intel)
 dep_cunit = dependency('cunit', version : '>= 2.1', required : false)
@@ -286,7 +289,7 @@ libdrm = shared_library(
    ),
    config_file,
   ],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   dependencies : [dep_valgrind, dep_rt, dep_m],
   include_directories : inc_drm,
   version : '2.4.0',
diff --git a/nouveau/meson.build b/nouveau/meson.build
index 51c9a712..0c1498d7 100644
--- a/nouveau/meson.build
+++ b/nouveau/meson.build
@@ -22,7 +22,7 @@
 libdrm_nouveau = shared_library(
   'drm_nouveau',
   [files( 'nouveau.c', 'pushbuf.c', 'bufctx.c', 'abi16.c'), config_file],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
   dependencies : [dep_threads, dep_atomic_ops],
diff --git a/omap/meson.build b/omap/meson.build
index e57b8f5d..54698c6a 100644
--- a/omap/meson.build
+++ b/omap/meson.build
@@ -22,7 +22,7 @@ libdrm_omap = shared_library(
   'drm_omap',
   [files('omap_drm.c'), config_file],
   include_directories : [inc_root, inc_drm],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   link_with : libdrm,
   dependencies : [dep_pthread_stubs, dep_atomic_ops],
   version : '1.0.0',
diff --git a/radeon/meson.build b/radeon/meson.build
index b08c7442..1fc5282c 100644
--- a/radeon/meson.build
+++ b/radeon/meson.build
@@ -28,7 +28,7 @@ libdrm_radeon = shared_library(
     ),
     config_file,
   ],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
   dependencies : [dep_pthread_stubs, dep_atomic_ops],
diff --git a/tegra/meson.build b/tegra/meson.build
index 1f5c74b3..4bc454b6 100644
--- a/tegra/meson.build
+++ b/tegra/meson.build
@@ -24,7 +24,7 @@ libdrm_tegra = shared_library(
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
   dependencies : [dep_pthread_stubs, dep_atomic_ops],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   version : '0.0.0',
   install : true,
 )
diff --git a/tests/exynos/meson.build b/tests/exynos/meson.build
index 940c3ce4..3a048e8a 100644
--- a/tests/exynos/meson.build
+++ b/tests/exynos/meson.build
@@ -24,7 +24,7 @@ if with_libkms
   exynos_fimg2d_test = executable(
     'exynos_fimg2d_test',
     files('exynos_fimg2d_test.c'),
-    c_args : warn_c_args,
+    c_args : libdrm_c_args,
     include_directories : [inc_root, inc_drm, inc_exynos,
                            include_directories('../../libkms')],
     link_with : [libdrm, libkms, libdrm_exynos],
@@ -36,7 +36,7 @@ endif
 exynos_fimg2d_perf = executable(
   'exynos_fimg2d_perf',
   files('exynos_fimg2d_perf.c'),
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_drm, inc_exynos],
   link_with : [libdrm, libdrm_exynos],
   dependencies : dep_threads,
@@ -46,7 +46,7 @@ exynos_fimg2d_perf = executable(
 exynos_fimg2d_event = executable(
   'exynos_fimg2d_event',
   files('exynos_fimg2d_event.c'),
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_drm, inc_exynos],
   link_with : [libdrm, libdrm_exynos],
   dependencies : dep_threads,
diff --git a/tests/kms/meson.build b/tests/kms/meson.build
index 1f7f724d..91371aa0 100644
--- a/tests/kms/meson.build
+++ b/tests/kms/meson.build
@@ -27,7 +27,7 @@ libkms_test = static_library(
   ),
   include_directories : [inc_root, inc_tests, inc_drm],
   link_with : libdrm,
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
 )
 
 kms_steal_crtc = executable(
diff --git a/tests/kmstest/meson.build b/tests/kmstest/meson.build
index a47d4951..4fb870f9 100644
--- a/tests/kmstest/meson.build
+++ b/tests/kmstest/meson.build
@@ -21,7 +21,7 @@
 kmstest = executable(
   'kmstest',
   files('main.c'),
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [
     inc_root, inc_tests, include_directories('../../libkms'), inc_drm,
   ],
diff --git a/tests/meson.build b/tests/meson.build
index fdf950b7..6c8ddd9c 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -53,7 +53,7 @@ drmsl = executable(
   files('drmsl.c'),
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
 )
 
 hash = executable(
@@ -61,7 +61,7 @@ hash = executable(
   files('hash.c'),
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
 )
 
 random = executable(
@@ -69,7 +69,7 @@ random = executable(
   files('random.c'),
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
 )
 
 drmdevice = executable(
@@ -77,7 +77,7 @@ drmdevice = executable(
   files('drmdevice.c'),
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
 )
 
 test('random', random, timeout : 240)
diff --git a/tests/modeprint/meson.build b/tests/modeprint/meson.build
index 5f0eb24b..898fd181 100644
--- a/tests/modeprint/meson.build
+++ b/tests/modeprint/meson.build
@@ -21,7 +21,7 @@
 modeprint = executable(
   'modeprint',
   files('modeprint.c'),
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_tests, inc_drm],
   link_with : libdrm,
   dependencies : dep_threads,
diff --git a/tests/modetest/meson.build b/tests/modetest/meson.build
index 2a081845..23d84a1d 100644
--- a/tests/modetest/meson.build
+++ b/tests/modetest/meson.build
@@ -21,7 +21,7 @@
 modetest = executable(
   'modetest',
   files('buffers.c', 'cursor.c', 'modetest.c'),
-  c_args : [warn_c_args, '-Wno-pointer-arith'],
+  c_args : [libdrm_c_args, '-Wno-pointer-arith'],
   include_directories : [inc_root, inc_tests, inc_drm],
   dependencies : [dep_threads, dep_cairo],
   link_with : [libdrm, libutil],
diff --git a/tests/nouveau/meson.build b/tests/nouveau/meson.build
index f5d73c1e..ca4d44f0 100644
--- a/tests/nouveau/meson.build
+++ b/tests/nouveau/meson.build
@@ -24,7 +24,7 @@ threaded = executable(
   dependencies : [dep_dl, dep_threads],
   include_directories : [inc_root, inc_drm, include_directories('../../nouveau')],
   link_with : [libdrm, libdrm_nouveau],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
 )
 
 test('threaded', threaded)
diff --git a/tests/proptest/meson.build b/tests/proptest/meson.build
index 22d7473e..9c87965a 100644
--- a/tests/proptest/meson.build
+++ b/tests/proptest/meson.build
@@ -21,7 +21,7 @@
 proptest = executable(
   'proptest',
   files('proptest.c'),
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_tests, inc_drm],
   link_with : [libdrm, libutil],
   install : with_install_tests,
diff --git a/tests/radeon/meson.build b/tests/radeon/meson.build
index 9e4f916e..bb345b73 100644
--- a/tests/radeon/meson.build
+++ b/tests/radeon/meson.build
@@ -23,5 +23,5 @@ radeon_ttm = executable(
   files('rbo.c', 'radeon_ttm.c'),
   include_directories : [inc_root, inc_drm],
   link_with : libdrm,
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
 )
diff --git a/tests/tegra/meson.build b/tests/tegra/meson.build
index 9c74ac4a..4f8c54f4 100644
--- a/tests/tegra/meson.build
+++ b/tests/tegra/meson.build
@@ -22,6 +22,6 @@ openclose = executable(
   'openclose',
   files('openclose.c'),
   include_directories : [inc_root, inc_drm, include_directories('../../tegra')],
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   link_with : [libdrm, libdrm_tegra],
 )
diff --git a/tests/vbltest/meson.build b/tests/vbltest/meson.build
index ae52ab88..6339feba 100644
--- a/tests/vbltest/meson.build
+++ b/tests/vbltest/meson.build
@@ -21,7 +21,7 @@
 vbltest = executable(
   'vbltest',
   files('vbltest.c'),
-  c_args : warn_c_args,
+  c_args : libdrm_c_args,
   include_directories : [inc_root, inc_tests, inc_drm],
   link_with : [libdrm, libutil],
   install : with_install_tests,