Fix noinline for older compiler versions (e.g. Visual Studio 6.0)

Visual Studio 6.0 does not support __declspec(noinline) and throw error.

Add checks for compilers which support noinline to prevent compile errors.

1 files changed, 11 insertions, 1 deletions

diff --git a/src/dlfcn.c b/src/dlfcn.c
index c4f410d..86f24df 100644
--- a/src/dlfcn.c
+++ b/src/dlfcn.c
@@ -61,6 +61,16 @@ typedef ULONG ULONG_PTR;
 #endif

 #include "dlfcn.h"

 

+#if defined( _MSC_VER ) && _MSC_VER >= 1300

+/* https://docs.microsoft.com/en-us/cpp/cpp/noinline */

+#define DLFCN_NOINLINE __declspec( noinline )

+#elif defined( __GNUC__ ) && ( ( __GNUC__ > 3 ) || ( __GNUC__ == 3 && __GNUC_MINOR__ >= 1 ) )

+/* https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html */

+#define DLFCN_NOINLINE __attribute__(( noinline ))

+#else

+#define DLFCN_NOINLINE

+#endif

+

 /* Note:

  * MSDN says these functions are not thread-safe. We make no efforts to have

  * any kind of thread safety.

@@ -418,7 +428,7 @@ int dlclose( void *handle )
     return (int) ret;

 }

 

-__declspec(noinline) /* Needed for _ReturnAddress() */

+DLFCN_NOINLINE /* Needed for _ReturnAddress() */

 DLFCN_EXPORT

 void *dlsym( void *handle, const char *name )

 {