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Use __has_declspec_attribute for shared builds 

Clang compilation targets may support `__declspec` attributes. Because of that it has a `__has_declspec_attribute` [check](https://clang.llvm.org/docs/LanguageExtensions.html#has-declspec-attribute).

Currently libpsl just assumes that `__declspec` is Windows only. This adds a compatibility macro and checks whether `dllimport` and `dllexport` are available.
This commit is contained in:
Don 2018-09-24 17:17:48 -07:00 committed by Tim Rühsen
parent a3bd08fbf2
commit 02648135c9
1 changed files with 7 additions and 2 deletions
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9
include/libpsl.h.in
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@ -40,12 +40,17 @@
#define PSL_VERSION_PATCH @LIBPSL_VERSION_PATCH@
#define PSL_VERSION_NUMBER @LIBPSL_VERSION_NUMBER@
// support clang's __has_declspec_attribute attribute
#ifndef __has_declspec_attribute
# define __has_declspec_attribute(x) 0
#endif
#ifndef PSL_API
#if defined BUILDING_PSL && HAVE_VISIBILITY
# define PSL_API __attribute__ ((__visibility__("default")))
#elif defined BUILDING_PSL && defined _MSC_VER && !defined PSL_STATIC
#elif defined BUILDING_PSL && (defined _MSC_VER || __has_declspec_attribute(dllexport)) && !defined PSL_STATIC
# define PSL_API __declspec(dllexport)
#elif defined _MSC_VER && !defined PSL_STATIC
#elif (defined _MSC_VER || __has_declspec_attribute(dllimport)) && !defined PSL_STATIC
# define PSL_API __declspec(dllimport)
#else
# define PSL_API