+# Check for atomic intrinsics
+AC_CACHE_CHECK([for native atomic primitives], drm_cv_atomic_primitives, [
+ drm_cv_atomic_primitives="none"
+
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+ int atomic_add(int i) { return __sync_fetch_and_add (&i, 1); }
+ int atomic_cmpxchg(int i, int j, int k) { return __sync_val_compare_and_swap (&i, j, k); }
+ ]],[[]])], [drm_cv_atomic_primitives="Intel"],[])
+
+ if test "x$drm_cv_atomic_primitives" = "xnone"; then
+ AC_CHECK_HEADER([atomic_ops.h], drm_cv_atomic_primitives="libatomic-ops")
+ fi
+
+ # atomic functions defined in <atomic.h> & libc on Solaris
+ if test "x$drm_cv_atomic_primitives" = "xnone"; then
+ AC_CHECK_FUNC([atomic_cas_uint], drm_cv_atomic_primitives="Solaris")
+ fi
+])
+
+if test "x$drm_cv_atomic_primitives" = xIntel; then
+ AC_DEFINE(HAVE_LIBDRM_ATOMIC_PRIMITIVES, 1,
+ [Enable if your compiler supports the Intel __sync_* atomic primitives])
+fi
+if test "x$drm_cv_atomic_primitives" = "xlibatomic-ops"; then
+ AC_DEFINE(HAVE_LIB_ATOMIC_OPS, 1, [Enable if you have libatomic-ops-dev installed])
+fi
+
+if test "x$INTEL" != "xno" -o "x$RADEON" != "xno" -o "x$NOUVEAU" != "xno"; then
+ if test "x$drm_cv_atomic_primitives" = "xnone"; then
+ if test "x$INTEL" != "xauto"; then
+ if test "x$INTEL" != "xno"; then
+ AC_MSG_ERROR([libdrm_intel depends upon atomic operations, which were not found for your compiler/cpu. Try compiling with -march=native, or install the libatomics-op-dev package, or, failing both of those, disable support for Intel GPUs by passing --disable-intel to ./configure])
+ fi
+ else
+ AC_MSG_WARN([Disabling libdrm_intel. It depends on atomic operations, which were not found for your compiler/cpu. Try compiling with -march=native, or install the libatomics-op-dev package.])
+ INTEL=no
+ fi
+ if test "x$RADEON" != "xauto"; then
+ if test "x$RADEON" != "xno"; then
+ AC_MSG_ERROR([libdrm_radeon depends upon atomic operations, which were not found for your compiler/cpu. Try compiling with -march=native, or install the libatomics-op-dev package, or, failing both of those, disable support for Radeon GPUs by passing --disable-radeon to ./configure])
+ fi
+ else
+ AC_MSG_WARN([Disabling libdrm_radeon. It depends on atomic operations, which were not found for your compiler/cpu. Try compiling with -march=native, or install the libatomics-op-dev package.])
+ RADEON=no
+ fi
+ if test "x$NOUVEAU" != "xauto"; then
+ if test "x$NOUVEAU" != "xno"; then
+ AC_MSG_ERROR([libdrm_nouveau depends upon atomic operations, which were not found for your compiler/cpu. Try compiling with -march=native, or install the libatomics-op-dev package, or, failing both of those, disable support for NVIDIA GPUs by passing --disable-nouveau to ./configure])
+ fi
+ else
+ AC_MSG_WARN([Disabling libdrm_nouveau. It depends on atomic operations, which were not found for your compiler/cpu. Try compiling with -march=native, or install the libatomics-op-dev package.])
+ NOUVEAU=no
+ fi
+ else
+ if test "x$INTEL" != "xno"; then
+ case $host_cpu in
+ i?86|x86_64) INTEL=yes ;;
+ *) INTEL=no ;;
+ esac
+ fi
+ if test "x$RADEON" != "xno"; then
+ RADEON=yes
+ fi
+ if test "x$NOUVEAU" != "xno"; then
+ NOUVEAU=yes
+ fi
+ fi
+fi
+
+if test "x$INTEL" != "xno"; then
+ PKG_CHECK_MODULES(PCIACCESS, [pciaccess >= 0.10])
+fi
+AC_SUBST(PCIACCESS_CFLAGS)
+AC_SUBST(PCIACCESS_LIBS)
+