Add cmake options to require specific backends

Note that this alone doesn't gurantee run-time availability for backends libs
that are loaded at run-time.

1 files changed, 37 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a46160cb..78961b09 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,6 +36,16 @@ OPTION(PULSEAUDIO "Check for PulseAudio backend"       ON)
 OPTION(COREAUDIO  "Check for CoreAudio backend"        ON)
 OPTION(WAVE    "Enable Wave Writer backend"            ON)
 
+OPTION(REQUIRE_ALSA       "Require ALSA backend"               OFF)
+OPTION(REQUIRE_OSS        "Require OSS backend"                OFF)
+OPTION(REQUIRE_SOLARIS    "Require Solaris backend"            OFF)
+OPTION(REQUIRE_MMDEVAPI   "Require MMDevApi"                   OFF)
+OPTION(REQUIRE_DSOUND     "Require DirectSound backend"        OFF)
+OPTION(REQUIRE_WINMM      "Require Windows Multimedia backend" OFF)
+OPTION(REQUIRE_PORTAUDIO  "Require PortAudio backend"          OFF)
+OPTION(REQUIRE_PULSEAUDIO "Require PulseAudio backend"         OFF)
+OPTION(REQUIRE_COREAUDIO  "Require CoreAudio backend"          OFF)
+
 OPTION(DLOPEN  "Check for the dlopen API for loading optional libs"  ON)
 
 OPTION(WERROR  "Treat compile warnings as errors"      OFF)
@@ -385,6 +395,9 @@ IF(ALSA)
         ENDIF()
     ENDIF()
 ENDIF()
+IF(REQUIRE_ALSA AND NOT HAVE_ALSA)
+    MESSAGE(FATAL_ERROR "Failed to enabled required ALSA backend")
+ENDIF()
 
 # Check OSS backend
 IF(OSS)
@@ -395,6 +408,9 @@ IF(OSS)
         SET(BACKENDS  "${BACKENDS} OSS,")
     ENDIF()
 ENDIF()
+IF(REQUIRE_OSS AND NOT HAVE_OSS)
+    MESSAGE(FATAL_ERROR "Failed to enabled required OSS backend")
+ENDIF()
 
 # Check Solaris backend
 IF(SOLARIS)
@@ -405,6 +421,9 @@ IF(SOLARIS)
         SET(BACKENDS  "${BACKENDS} Solaris,")
     ENDIF()
 ENDIF()
+IF(REQUIRE_SOLARIS AND NOT HAVE_SOLARIS)
+    MESSAGE(FATAL_ERROR "Failed to enabled required Solaris backend")
+ENDIF()
 
 # Check for MMDevApi backend
 IF(HAVE_WINDOWS_H)
@@ -418,6 +437,9 @@ IF(HAVE_WINDOWS_H)
         ENDIF()
     ENDIF()
 ENDIF()
+IF(REQUIRE_MMDEVAPI AND NOT HAVE_MMDEVAPI)
+    MESSAGE(FATAL_ERROR "Failed to enabled required MMDevApi backend")
+ENDIF()
 
 # Check DSound/MMSystem backend
 IF(DSOUND)
@@ -437,6 +459,9 @@ IF(DSOUND)
         ENDIF()
     ENDIF()
 ENDIF()
+IF(REQUIRE_DSOUND AND NOT HAVE_DSOUND)
+    MESSAGE(FATAL_ERROR "Failed to enabled required DSound backend")
+ENDIF()
 
 IF(HAVE_WINDOWS_H)
     IF(WINMM)
@@ -448,6 +473,9 @@ IF(HAVE_WINDOWS_H)
         ENDIF()
     ENDIF()
 ENDIF()
+IF(REQUIRE_WINMM AND NOT HAVE_WINMM)
+    MESSAGE(FATAL_ERROR "Failed to enabled required WinMM backend")
+ENDIF()
 
 # Check PortAudio backend
 IF(PORTAUDIO)
@@ -466,6 +494,9 @@ IF(PORTAUDIO)
         ENDIF()
     ENDIF()
 ENDIF()
+IF(REQUIRE_PORTAUDIO AND NOT HAVE_PORTAUDIO)
+    MESSAGE(FATAL_ERROR "Failed to enabled required PortAudio backend")
+ENDIF()
 
 # Check PortAudio backend
 IF(PULSEAUDIO)
@@ -484,6 +515,9 @@ IF(PULSEAUDIO)
         ENDIF()
     ENDIF()
 ENDIF()
+IF(REQUIRE_PULSEAUDIO AND NOT HAVE_PULSEAUDIO)
+    MESSAGE(FATAL_ERROR "Failed to enabled required PulseAudio backend")
+ENDIF()
 
 # Check CoreAudio backend
 IF(COREAUDIO)
@@ -497,6 +531,9 @@ IF(COREAUDIO)
         SET(EXTRA_LIBS /System/Library/Frameworks/ApplicationServices.framework ${EXTRA_LIBS})
     ENDIF()
 ENDIF()
+IF(REQUIRE_COREAUDIO AND NOT HAVE_COREAUDIO)
+    MESSAGE(FATAL_ERROR "Failed to enabled required CoreAudio backend")
+ENDIF()
 
 # Optionally enable the Wave Writer backend
 IF(WAVE)