Commit 2185ed0d authored by Niels Möller's avatar Niels Möller

Autoconf check for ifunc support.

parent 343be0b5
2015-01-13 Niels Möller <nisse@lysator.liu.se>
* aclocal.m4 (NETTLE_CHECK_IFUNC): New macro, checking for ifunc
and settting HAVE_LINK_IFUNC if working.
* configure.ac: Use it.
2015-01-12 Niels Möller <nisse@lysator.liu.se>
* asm.m4 (DECLARE_FUNC): New macro, extracted from PROLOGUE.
......
......@@ -643,6 +643,41 @@ foo:
fi
])
dnl NETTLE_CHECK_IFUNC
dnl ------------------
dnl Check if __attribute__ ((ifunc(...))) works
AC_DEFUN([NETTLE_CHECK_IFUNC],
[AC_REQUIRE([AC_PROG_CC])
AC_CACHE_CHECK([for ifunc support],
nettle_cv_link_ifunc,
AC_LINK_IFELSE([AC_LANG_PROGRAM([
static int
foo_imp(int x)
{
return 1;
}
typedef void void_func (void);
static void_func *
foo_resolv(void)
{
return (void_func *) foo_imp;
}
int foo (int x) __attribute__ ((ifunc("foo_resolv")));
],[
return foo(0);
])],
[nettle_cv_link_ifunc=yes],
[nettle_cv_link_ifunc=no]))
AH_TEMPLATE([HAVE_LINK_IFUNC], [Define if compiler and linker supports __attribute__ ifunc])
if test "x$nettle_cv_link_ifunc" = xyes ; then
AC_DEFINE(HAVE_LINK_IFUNC)
fi
])
dnl @synopsis AX_CREATE_STDINT_H [( HEADER-TO-GENERATE [, HEADERS-TO-CHECK])]
dnl
dnl the "ISO C9X: 7.18 Integer types <stdint.h>" section requires the
......
......@@ -95,6 +95,8 @@ LSH_RPATH_INIT([`echo $with_lib_path | sed 's/:/ /g'` \
# Checks for programs.
AC_PROG_CC
NETTLE_CHECK_IFUNC
# When $CC foo.c -o foo creates both foo and foo.exe, autoconf picks
# up the foo.exe and sets exeext to .exe. That is correct for cygwin,
# which has some kind of magic link from foo to foo.exe, but not for
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment