gallium/auxilary: more __cplusplus exports

swr driver which is written in C++ needs access to some more
gallium utility functions than are currently exposed.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Acked-by: Jose Fonseca <jfonseca@vmware.com>

src/gallium/auxiliary/gallivm/lp_bld_flow.h

@@ -37,6 +37,9 @@
 
 #include "gallivm/lp_bld.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 struct lp_type;
 
@@ -198,4 +201,8 @@ lp_build_array_alloca(struct gallivm_state *gallivm,
                       LLVMValueRef count,
                       const char *name);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* !LP_BLD_FLOW_H */

src/gallium/auxiliary/gallivm/lp_bld_init.h

@@ -35,6 +35,9 @@
 #include "lp_bld.h"
 #include <llvm-c/ExecutionEngine.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 struct gallivm_state
 {
@@ -82,4 +85,8 @@ void
 lp_set_store_alignment(LLVMValueRef Inst,
 		       unsigned Align);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* !LP_BLD_INIT_H */

src/gallium/auxiliary/gallivm/lp_bld_sample.h

@@ -42,6 +42,9 @@
 #include "gallivm/lp_bld_type.h"
 #include "gallivm/lp_bld_swizzle.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 struct pipe_resource;
 struct pipe_sampler_view;
@@ -625,5 +628,8 @@ lp_build_minify(struct lp_build_context *bld,
                 LLVMValueRef level,
                 boolean lod_scalar);
 
+#ifdef __cplusplus
+}
+#endif
 
 #endif /* LP_BLD_SAMPLE_H */

src/gallium/auxiliary/gallivm/lp_bld_tgsi.h

@@ -48,6 +48,10 @@
 #include "tgsi/tgsi_scan.h"
 #include "tgsi/tgsi_info.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define LP_CHAN_ALL ~0
 
 #define LP_MAX_INSTRUCTIONS 256
@@ -663,4 +667,8 @@ lp_build_tgsi_llvm(
    struct lp_build_tgsi_context * bld_base,
    const struct tgsi_token *tokens);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* LP_BLD_TGSI_H */

src/gallium/auxiliary/util/u_dl.h

@@ -32,6 +32,9 @@
 
 #include "pipe/p_config.h"
 
+#ifdef	__cplusplus
+extern "C" {
+#endif
 
 #if defined(PIPE_OS_WINDOWS)
 #  define UTIL_DL_EXT ".dll"
@@ -79,5 +82,8 @@ util_dl_close(struct util_dl_library *library);
 const char *
 util_dl_error(void);
 
+#ifdef	__cplusplus
+}
+#endif
 
 #endif /* U_DL_H_ */