Fix musl-related build issues

.azure/Dockerfile.azure-alpine

@@ -6,7 +6,10 @@ RUN apk add --no-cache --virtual .pipeline-deps readline linux-pam \
   && apk add \
     cmake make \
     glib-dev \
+    dbus-dev \
     ladspa-dev \
+    libsndfile-dev \
+    sdl2-dev \
     nodejs-current \
     gcc g++ \
     pkgconf \

.azure/azure-pipelines-alpine.yml

@@ -75,7 +75,7 @@ stages:
           gentoo-flags:
             CFLAGS: '-pipe -frecord-gcc-switches -fno-diagnostics-color -fmessage-length=0 -D_POSIX_C_SOURCE=199506L'
             CXXFLAGS: '-pipe -frecord-gcc-switches -fno-diagnostics-color -fmessage-length=0'
-            CMFLAGS: '-Denable-profiling=yes -Denable-pulseaudio=no -Denable-pipewire=no -Denable-readline=yes -Denable-systemd=no -Denable-threads=no -Denable-trap-on-fpe=yes -Denable-ubsan=OFF'
+            CMFLAGS: '-Denable-profiling=yes -Denable-readline=yes -Denable-systemd=no -Denable-threads=no -Denable-trap-on-fpe=yes -Denable-ubsan=OFF'
           strncasecmp-flags:
             CFLAGS: '-D_POSIX_C_SOURCE=199506L -DNCURSES_WIDECHAR'
             CMFLAGS: '-Denable-floats=1 -Denable-benchmark=1'

CMakeLists.txt

@@ -159,6 +159,7 @@ include ( CheckIncludeFile )
 include ( CheckSymbolExists )
 include ( CheckTypeSize )
 check_include_file ( string.h HAVE_STRING_H )
+check_include_file ( strings.h HAVE_STRINGS_H )
 check_include_file ( stdlib.h HAVE_STDLIB_H )
 check_include_file ( stdio.h HAVE_STDIO_H )
 check_include_file ( math.h HAVE_MATH_H )

src/bindings/fluid_rtkit.c

@@ -25,6 +25,11 @@
   SOFTWARE.
 ***/
 
+#ifndef _GNU_SOURCE
+// required for syscall()
+#define _GNU_SOURCE
+#endif
+
 #include "fluid_sys.h"
 
 #ifdef DBUS_SUPPORT
@@ -34,11 +39,6 @@
 
 #if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__DragonFly__)
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-
-#endif
-
 #include <sys/syscall.h>
 #include <sys/resource.h>
 

src/drivers/fluid_alsa.c

@@ -34,7 +34,7 @@
 
 #define ALSA_PCM_NEW_HW_PARAMS_API
 #include <alsa/asoundlib.h>
-#include <sys/poll.h>
+#include <poll.h>
 #include <math.h>
 
 #include "fluid_lash.h"

src/drivers/fluid_oss.c

@@ -47,7 +47,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
-#include <sys/poll.h>
+#include <poll.h>
 
 #define BUFFER_LENGTH 512
 

src/sfloader/fluid_sfont.c

@@ -46,9 +46,9 @@ fluid_long_long_t default_ftell(void *handle)
 }
 
 #ifdef _WIN32
-    #define PRIi64 "%I64d"
+#define FLUID_PRIi64 "I64d"
 #else
-    #define PRIi64 "%lld"
+#define FLUID_PRIi64 "lld"
 #endif
 
 int safe_fread(void *buf, fluid_long_long_t count, void *fd)
@@ -57,7 +57,7 @@ int safe_fread(void *buf, fluid_long_long_t count, void *fd)
     {
         if(feof((FILE *)fd))
         {
-            FLUID_LOG(FLUID_ERR, "EOF while attempting to read " PRIi64 " bytes", count);
+            FLUID_LOG(FLUID_ERR, "EOF while attempting to read %" FLUID_PRIi64 " bytes", count);
         }
         else
         {
@@ -74,14 +74,14 @@ int safe_fseek(void *fd, fluid_long_long_t ofs, int whence)
 {
     if(FLUID_FSEEK((FILE *)fd, ofs, whence) != 0)
     {
-        FLUID_LOG(FLUID_ERR, "File seek failed with offset = " PRIi64 " and whence = %d", ofs, whence);
+        FLUID_LOG(FLUID_ERR, "File seek failed with offset = %" FLUID_PRIi64 " and whence = %d", ofs, whence);
         return FLUID_FAILED;
     }
 
     return FLUID_OK;
 }
 
-#undef PRIi64
+#undef FLUID_PRIi64
 
 /**
  * Creates a new SoundFont loader.

src/synth/fluid_synth.c

@@ -290,8 +290,12 @@ static void
 fluid_synth_init(void)
 {
 #ifdef TRAP_ON_FPE
+  #if !defined(__GLIBC__) && defined(__linux__)
+    #warning "Trap on FPE is only supported when using glibc!"
+  #else
     /* Turn on floating point exception traps */
     feenableexcept(FE_DIVBYZERO | FE_OVERFLOW | FE_INVALID);
+  #endif
 #endif
 
     init_dither();

src/utils/fluidsynth_priv.h

@@ -45,6 +45,9 @@
 #include <string.h>
 #endif
 
+#if HAVE_STRINGS_H
+#include <strings.h>
+#endif
 
 #include "fluidsynth.h"