On Saturday 03 December 2011 22:40:51 Cactus wrote:
> I can only comment on the MSVC Windows build, for which I believe mpir.h is
> identical DLL and static library builds. To double check this I have just
> built both and compared the two mpir.h files that were generated.
>
> In fact mpir.h is now identical for win32 and x64 builds as well since I
> changed this recently to avoid any differences because an increasing number
> of people were trying to compile MPIR with the wrong version.
>
> Brian
>
>
Aha , only for cygwin and MSYS then which use the autotools , as in
configure.in we have this
# Configs for Windows DLLs.
AC_LIBTOOL_WIN32_DLL
AC_SUBST(LIBGMP_DLL,0)
case $host in
*-*-cygwin* | *-*-mingw*)
# By default, build only static.
if test -z "$enable_shared"; then
enable_shared=no
fi
# Don't allow both static and DLL.
if test "$enable_shared" != no && test "$enable_static" != no; then
AC_MSG_ERROR([cannot build both static and DLL, since mpir.h is different
for each.
Use "--disable-static --enable-shared" to build just a DLL.])
fi
# "-no-undefined" is required when building a DLL, see documentation on
# AC_LIBTOOL_WIN32_DLL.
#
# "-Wl,--export-all-symbols" is a bit of a hack, it gets all libmpir and
# libmpirxx functions and variables exported. This is what libtool did
# in the past, and it's convenient for us in the test programs.
#
# Maybe it'd be prudent to check for --export-all-symbols before using
# it, but it seems to have been in ld since at least 2000, and there's
# not really any alternative we want to take up at the moment.
#
# "-Wl,output-def" is used to get a .def file for use by MS lib to make
# a .lib import library, described in the manual. libmpir-3.dll.def
# corresponds to the libmp-3.dll.def generated by libtool (as a result
# of -export-symbols on that library).
#
# Incidentally, libtool does generate an import library libmpir.dll.a,
# but it's "ar" format and cannot be used by the MS linker. There
# doesn't seem to be any GNU tool for generating or converting to .lib.
#
# FIXME: The .def files produced by -Wl,output-def include isascii,
# iscsym, iscsymf and toascii, apparently because mingw ctype.h doesn't
# inline isascii (used in gmp). It gives an extern inline for
# __isascii, but for some reason not the plain isascii.
#
# LDFLAGS="$LDFLAGS -Wl,--enable-auto-import" this is too general
if test "$enable_shared" = yes; then
GMP_LDFLAGS="$GMP_LDFLAGS -no-undefined -Wl,--export-all-symbols"
LIBGMP_LDFLAGS="$LIBGMP_LDFLAGS -Wl,--output-def,.libs/libmpir-3.dll.def"
LIBGMPXX_LDFLAGS="$LIBGMP_LDFLAGS
-Wl,--output-def,.libs/libmpirxx-3.dll.def"
LIBGMP_DLL=1
fi
;;
esac
and note there are a few other systems which also can't build both types at the
same time
Jason
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