On Mon, Mar 22, 2010 at 02:25:36AM +0100, Matthias Bolte wrote:
> The MinGW linker needs the libvirt.def file.
> ---
> configure.ac | 5 +++++
> src/.gitignore | 1 +
> src/Makefile.am | 15 +++++++++++----
> 3 files changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index bcf1d5a..6e568ee 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -1733,6 +1733,7 @@ CYGWIN_EXTRA_LIBADD=
> CYGWIN_EXTRA_PYTHON_LIBADD=
> MINGW_EXTRA_LDFLAGS=
> WIN32_EXTRA_CFLAGS=
> +LIBVIRT_SYMBOL_FILE=libvirt.syms
> case "$host" in
> *-*-cygwin*)
> CYGWIN_EXTRA_LDFLAGS="-no-undefined"
> @@ -1752,6 +1753,9 @@ case "$host" in
> if test "x$enable_shared" = "xno"; then
> WIN32_EXTRA_CFLAGS="-DLIBVIRT_STATIC"
> fi
> + # Also set the symbol file to .def, so src/Makefile generates libvirt.def
> + # from libvirt.syms and passes libvirt.def instead of libvirt.syms to the linker
> + LIBVIRT_SYMBOL_FILE=libvirt.def
> ;;
> esac
> AC_SUBST([CYGWIN_EXTRA_LDFLAGS])
> @@ -1759,6 +1763,7 @@ AC_SUBST([CYGWIN_EXTRA_LIBADD])
> AC_SUBST([CYGWIN_EXTRA_PYTHON_LIBADD])
> AC_SUBST([MINGW_EXTRA_LDFLAGS])
> AC_SUBST([WIN32_EXTRA_CFLAGS])
> +AC_SUBST([LIBVIRT_SYMBOL_FILE])
>
> dnl Look for windres to build a Windows icon resource.
> AC_CHECK_TOOL([WINDRES], [windres], [no])
> diff --git a/src/.gitignore b/src/.gitignore
> index 26b8689..a5c27a5 100644
> --- a/src/.gitignore
> +++ b/src/.gitignore
> @@ -12,6 +12,7 @@ Makefile.in
> *.cov
> libvirt_parthelper
> libvirt_lxc
> +libvirt.def
> libvirt.syms
> *.i
> *.s
> diff --git a/src/Makefile.am b/src/Makefile.am
> index 0aa3443..fea1bd3 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -828,7 +828,7 @@ EXTRA_DIST += \
> libvirt_macvtap.syms \
> libvirt_daemon.syms
>
> -BUILT_SOURCES = libvirt.syms
> +BUILT_SOURCES = libvirt.syms libvirt.def
>
> libvirt.syms: libvirt_public.syms $(USED_SYM_FILES)
> rm -f $@-tmp $@
> @@ -844,18 +844,25 @@ libvirt.syms: libvirt_public.syms $(USED_SYM_FILES)
> chmod a-w $@-tmp
> mv $@-tmp libvirt.syms
>
> +libvirt.def: libvirt.syms
> + rm -f -- $@-tmp $@
> + printf 'EXPORTS\n' > $@-tmp
> + sed -e '/^$$/d; /#/d; /:/d; /\}/d; /\*/d; /LIBVIRT_/d; s/\(.*\)\;/\1/g' $^ >> $@-tmp
> + chmod a-w $@-tmp
> + mv $@-tmp libvirt.def
> +
> # Empty source list - it merely links a bunch of convenience libs together
> libvirt_la_SOURCES =
> libvirt_la_LIBADD += \
> $(CYGWIN_EXTRA_LIBADD) ../gnulib/lib/libgnu.la
> -libvirt_la_LDFLAGS = $(VERSION_SCRIPT_FLAGS)libvirt.syms \
> +libvirt_la_LDFLAGS = $(VERSION_SCRIPT_FLAGS)$(LIBVIRT_SYMBOL_FILE) \
> -version-info $(LIBVIRT_VERSION_INFO) \
> $(COVERAGE_CFLAGS:-f%=-Wc,-f%) \
> $(LIBXML_LIBS) \
> $(DRIVER_MODULE_LIBS) \
> $(CYGWIN_EXTRA_LDFLAGS) $(MINGW_EXTRA_LDFLAGS)
> libvirt_la_CFLAGS = $(COVERAGE_CFLAGS) -DIN_LIBVIRT
> -libvirt_la_DEPENDENCIES = $(libvirt_la_LIBADD) libvirt.syms
> +libvirt_la_DEPENDENCIES = $(libvirt_la_LIBADD) $(LIBVIRT_SYMBOL_FILE)
>
> # Create an automake "convenience library" version of libvirt_la,
> # just for testing, since the test harness requires access to internal
> @@ -865,7 +872,7 @@ noinst_LTLIBRARIES += libvirt_test.la
> # Remove version script from convenience library
> test_LDFLAGS = \
> $$(echo '$(libvirt_la_LDFLAGS)' \
> - |sed 's!$(VERSION_SCRIPT_FLAGS)libvirt.syms!!' \
> + |sed 's!$(VERSION_SCRIPT_FLAGS)$(LIBVIRT_SYMBOL_FILE)!!' \
> |sed 's!-version-info $(LIBVIRT_VERSION_INFO)!!')
>
> # Just like the above, but with a slightly different set of public symbols.
I've re-examined this now to discover why we had this regression.
Originally, say in 0.7.5, everything was linking fine on Mingw32 without
this .defs file. I figured out that this is because Mingw32 was ignoring
our .syms file, and using its default logic of exporting *everything* :-)
Then, in
commit 190aaa2627a8c6e455088f1e7801708fb5f123b1
Author: Matthias Bolte <matthias.bolte@xxxxxxxxxxxxxx>
Date: Tue Mar 16 23:54:22 2010 +0100
Fix export of virConnectAuthPtrDefault for MinGW builds
Use the __declspec(dllexport/dllimport) stuff to export the symbol,
otherwise accessing virConnectAuthPtrDefault triggers a segfault.
We used declspec() on the virConnectAuthPtrDefault. This turned off the
Mingw32 logic that exported everything & thus caused virsh link failures.
Adding this .defs file as per your patch re-exports everything.
It sucks that we export everything, but it is no worse than the old
situation we had on mingw.
ACK to this patch
Daniel
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