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build: test for __declspec(dllexport) in configure

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This should work for GCC and Clang when building for Windows targets.
This commit is contained in:
fanquake 2020-07-14 20:37:21 +08:00
parent 1624e17b54
commit 7cd0a69664
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2 changed files with 16 additions and 7 deletions
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13
configure.ac
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@ -813,7 +813,6 @@ if test x$ac_cv_sys_large_files != x &&
CPPFLAGS="$CPPFLAGS -D_LARGE_FILES=$ac_cv_sys_large_files"
fi
AX_GCC_FUNC_ATTRIBUTE([dllexport])
AX_GCC_FUNC_ATTRIBUTE([dllimport])
if test x$use_glibc_compat != xno; then
@ -1000,6 +999,18 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([
]
)
AC_MSG_CHECKING([for dllexport attribute])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
__declspec(dllexport) int foo(void);
int main(){}
])],
[
AC_DEFINE(HAVE_DLLEXPORT_ATTRIBUTE,1,[Define if the dllexport attribute is supported.])
AC_MSG_RESULT(yes)
],
[AC_MSG_RESULT(no)]
)
dnl thread_local is currently disabled when building with glibc back compat.
dnl Our minimum supported glibc is 2.17, however support for thread_local
dnl did not arrive in glibc until 2.18.

10
src/script/bitcoinconsensus.h
View File

@ -11,12 +11,10 @@
#if defined(BUILD_BITCOIN_INTERNAL) && defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#if defined(_WIN32)
#if defined(DLL_EXPORT)
#if defined(HAVE_FUNC_ATTRIBUTE_DLLEXPORT)
#define EXPORT_SYMBOL __declspec(dllexport)
#else
#define EXPORT_SYMBOL
#endif
#if defined(HAVE_DLLEXPORT_ATTRIBUTE)
#define EXPORT_SYMBOL __declspec(dllexport)
#else
#define EXPORT_SYMBOL
#endif
#elif defined(HAVE_DEFAULT_VISIBILITY_ATTRIBUTE)
#define EXPORT_SYMBOL __attribute__ ((visibility ("default")))