build-sys: Move to compiling with C11 support

This is needed for building with anonymous unions. A bunch of calls to
fail() that used to mysteriously work need fixing -- fail() is a macro
that takes a printf-style message as an argument. Not passing this
somehow worked with the previous compiler flags, but breaks with
-std=c11.

14 files changed, 98 insertions, 20 deletions

diff --git a/configure.ac b/configure.ac
index 4553d714a..8454e4cf0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,7 +80,6 @@ AC_PROG_LN_S
 # CC
 
 AC_PROG_CC
-AC_PROG_CC_C99
 AM_PROG_CC_C_O
 # Only required if you want the WebRTC canceller -- no runtime dep on
 # libstdc++ otherwise
@@ -177,6 +176,11 @@ esac
 
 #### Compiler flags ####
 
+AX_CHECK_COMPILE_FLAG([-std=c11],
+   [],
+   [AC_MSG_ERROR([*** Compiler does not support -std=c11])],
+   [-pedantic -Werror])
+
 AX_APPEND_COMPILE_FLAGS(
     [-Wall -W -Wextra -pipe -Wno-long-long -Wno-overlength-strings -Wunsafe-loop-optimizations -Wundef -Wformat=2 -Wlogical-op -Wsign-compare -Wformat-security -Wmissing-include-dirs -Wformat-nonliteral -Wold-style-definition -Wpointer-arith -Winit-self -Wdeclaration-after-statement -Wfloat-equal -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-declarations -Wmissing-noreturn -Wshadow -Wendif-labels -Wcast-align -Wstrict-aliasing -Wwrite-strings -Wno-unused-parameter -ffast-math -fno-common -fdiagnostics-show-option -fdiagnostics-color=auto],
     [], [-pedantic -Werror])
diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
new file mode 100644
index 000000000..ca3639715
--- /dev/null
+++ b/m4/ax_check_compile_flag.m4
@@ -0,0 +1,74 @@
+# ===========================================================================
+#   http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+#   Check whether the given FLAG works with the current language's compiler
+#   or gives an error.  (Warnings, however, are ignored)
+#
+#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+#   success/failure.
+#
+#   If EXTRA-FLAGS is defined, it is added to the current language's default
+#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
+#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
+#   force the compiler to issue an error when a bad flag is given.
+#
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
+#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
+#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 4
+
+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
+AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
+  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
+  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
+  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
+    [AS_VAR_SET(CACHEVAR,[yes])],
+    [AS_VAR_SET(CACHEVAR,[no])])
+  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
+AS_VAR_IF(CACHEVAR,yes,
+  [m4_default([$2], :)],
+  [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_COMPILE_FLAGS
diff --git a/src/Makefile.am b/src/Makefile.am
index 432d9c27a..aa96999c1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -48,7 +48,7 @@ AM_CPPFLAGS = \
 	-DPA_SRCDIR=\"$(abs_srcdir)\" \
 	-DPA_BUILDDIR=\"$(abs_builddir)\" \
 	-DPULSE_LOCALEDIR=\"$(localedir)\"
-AM_CFLAGS = \
+AM_CFLAGS = -std=c11 \
 	$(PTHREAD_CFLAGS)
 AM_CXXFLAGS = -std=c++11 \
 	$(PTHREAD_CFLAGS)
diff --git a/src/tests/connect-stress.c b/src/tests/connect-stress.c
index 7c755e9ff..055ef1326 100644
--- a/src/tests/connect-stress.c
+++ b/src/tests/connect-stress.c
@@ -80,7 +80,7 @@ static void connect(const char *name, int *try) {
     /* Connect the context */
     if (pa_context_connect(context, NULL, 0, NULL) < 0) {
         fprintf(stderr, "pa_context_connect() failed.\n");
-        fail();
+        ck_abort();
     }
 
     ret = pa_threaded_mainloop_start(mainloop);
@@ -144,7 +144,7 @@ static void stream_state_callback(pa_stream *s, void *userdata) {
         default:
         case PA_STREAM_FAILED:
             fprintf(stderr, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
-            fail();
+            ck_abort();
     }
 }
 
@@ -190,7 +190,7 @@ static void context_state_callback(pa_context *c, void *userdata) {
         case PA_CONTEXT_FAILED:
         default:
             fprintf(stderr, "Context error: %s\n", pa_strerror(pa_context_errno(c)));
-            fail();
+            ck_abort();
     }
 }
 
diff --git a/src/tests/cpu-mix-test.c b/src/tests/cpu-mix-test.c
index f3bc0cce4..f42530d18 100644
--- a/src/tests/cpu-mix-test.c
+++ b/src/tests/cpu-mix-test.c
@@ -118,7 +118,7 @@ static void run_mix_test(
                     i,
                     samples[i], samples_ref[i],
                     samples0[i], samples1[i]);
-                fail();
+                ck_abort();
             }
         }
     }
diff --git a/src/tests/cpu-remap-test.c b/src/tests/cpu-remap-test.c
index cfe86479b..7af5e2923 100644
--- a/src/tests/cpu-remap-test.c
+++ b/src/tests/cpu-remap-test.c
@@ -70,7 +70,7 @@ static void run_remap_test_float(
                 pa_log_debug("Correctness test failed: align=%d", align);
                 pa_log_debug("%d: %.24f != %.24f\n", i,
                     out[i], out_ref[i]);
-                fail();
+                ck_abort();
             }
         }
     }
@@ -123,7 +123,7 @@ static void run_remap_test_s16(
             if (abs(out[i] - out_ref[i]) > 3) {
                 pa_log_debug("Correctness test failed: align=%d", align);
                 pa_log_debug("%d: %d != %d\n", i, out[i], out_ref[i]);
-                fail();
+                ck_abort();
             }
         }
     }
diff --git a/src/tests/cpu-sconv-test.c b/src/tests/cpu-sconv-test.c
index 2eb51de15..3f189d176 100644
--- a/src/tests/cpu-sconv-test.c
+++ b/src/tests/cpu-sconv-test.c
@@ -65,7 +65,7 @@ static void run_conv_test_float_to_s16(
             if (abs(samples[i] - samples_ref[i]) > 1) {
                 pa_log_debug("Correctness test failed: align=%d", align);
                 pa_log_debug("%d: %04hx != %04hx (%.24f)\n", i, samples[i], samples_ref[i], floats[i]);
-                fail();
+                ck_abort();
             }
         }
     }
@@ -115,7 +115,7 @@ static void run_conv_test_s16_to_float(
             if (fabsf(floats[i] - floats_ref[i]) > 0.0001f) {
                 pa_log_debug("Correctness test failed: align=%d", align);
                 pa_log_debug("%d: %.24f != %.24f (%d)\n", i, floats[i], floats_ref[i], samples[i]);
-                fail();
+                ck_abort();
             }
         }
     }
diff --git a/src/tests/cpu-volume-test.c b/src/tests/cpu-volume-test.c
index 01ac2fc53..15f065821 100644
--- a/src/tests/cpu-volume-test.c
+++ b/src/tests/cpu-volume-test.c
@@ -78,7 +78,7 @@ static void run_volume_test(
                 pa_log_debug("Correctness test failed: align=%d, channels=%d", align, channels);
                 pa_log_debug("%d: %04hx != %04hx (%04hx * %08x)\n", i, samples[i], samples_ref[i],
                         samples_orig[i], volumes[i % channels]);
-                fail();
+                ck_abort();
             }
         }
     }
diff --git a/src/tests/cpulimit-test.c b/src/tests/cpulimit-test.c
index 3a8124f95..e01a5b805 100644
--- a/src/tests/cpulimit-test.c
+++ b/src/tests/cpulimit-test.c
@@ -48,7 +48,7 @@ static void func(pa_mainloop_api *m, pa_signal_event *e, int sig, void *userdata
     if ((now - start) >= 30) {
         m->quit(m, 1);
         fprintf(stderr, "Test failed\n");
-        fail();
+        ck_abort();
     } else
         raise(SIGUSR1);
 }
@@ -78,7 +78,7 @@ START_TEST (cpulimit_test) {
 
         if ((now - start) >= 30) {
             fprintf(stderr, "Test failed\n");
-            fail();
+            ck_abort();
             break;
         }
     }
diff --git a/src/tests/extended-test.c b/src/tests/extended-test.c
index ee766b898..0d08facf6 100644
--- a/src/tests/extended-test.c
+++ b/src/tests/extended-test.c
@@ -100,7 +100,7 @@ static void stream_state_callback(pa_stream *s, void *userdata) {
         default:
         case PA_STREAM_FAILED:
             fprintf(stderr, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
-            fail();
+            ck_abort();
     }
 }
 
@@ -151,7 +151,7 @@ static void context_state_callback(pa_context *c, void *userdata) {
         case PA_CONTEXT_FAILED:
         default:
             fprintf(stderr, "Context error: %s\n", pa_strerror(pa_context_errno(c)));
-            fail();
+            ck_abort();
     }
 }
 
diff --git a/src/tests/get-binary-name-test.c b/src/tests/get-binary-name-test.c
index 4c855bb07..cd53bdebb 100644
--- a/src/tests/get-binary-name-test.c
+++ b/src/tests/get-binary-name-test.c
@@ -39,7 +39,7 @@ START_TEST (getbinaryname_test) {
         if (!pa_get_binary_name(exename, allocated)) {
             pa_log_error("failed to read binary name");
             pa_xfree(exename);
-            fail();
+            ck_abort();
         }
 
         if (strlen(exename) < allocated - 1) {
diff --git a/src/tests/interpol-test.c b/src/tests/interpol-test.c
index 7a7bffce9..b4cf18cc4 100644
--- a/src/tests/interpol-test.c
+++ b/src/tests/interpol-test.c
@@ -144,7 +144,7 @@ static void context_state_callback(pa_context *c, void *userdata) {
         case PA_CONTEXT_FAILED:
         default:
             pa_log_error("Context error: %s", pa_strerror(pa_context_errno(c)));
-            fail();
+            ck_abort();
     }
 }
 
diff --git a/src/tests/mult-s16-test.c b/src/tests/mult-s16-test.c
index 7340d8592..91740c2fe 100644
--- a/src/tests/mult-s16-test.c
+++ b/src/tests/mult-s16-test.c
@@ -65,7 +65,7 @@ START_TEST (mult_s16_test) {
 
         if (a != b) {
             pa_log_debug("%d: %d != %d", i, a, b);
-            fail();
+            ck_abort();
         }
     }
 
diff --git a/src/tests/sync-playback.c b/src/tests/sync-playback.c
index f06b45944..9ef038ca5 100644
--- a/src/tests/sync-playback.c
+++ b/src/tests/sync-playback.c
@@ -106,7 +106,7 @@ static void stream_state_callback(pa_stream *s, void *userdata) {
         default:
         case PA_STREAM_FAILED:
             fprintf(stderr, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
-            fail();
+            ck_abort();
     }
 }
 
@@ -148,7 +148,7 @@ static void context_state_callback(pa_context *c, void *userdata) {
         case PA_CONTEXT_FAILED:
         default:
             fprintf(stderr, "Context error: %s\n", pa_strerror(pa_context_errno(c)));
-            fail();
+            ck_abort();
     }
 }