gbuild: build static LO / link static executables

This allows to build a complete static LibreOffice on Linux,
except for linked externals. Since LO's static build implies
disabled dynamic loading, one must select one VCL backend to
be compiled in.

See the (large) comment in solenv/gbuild/static.mk trying to
explain, why this implementation was chosen (spoiler: seems
there is no other way) and what is actually implemented.

This will collect all libraries, statics and externals of
executables. If the executable uses components, it will get
linked to all static components. While it works with any
Executable, it just makes sense for soffice.bin, because the
static component map sucks every dependency in, bloating most
other binaries.

In theory on could generate the dependencies based on the list
of used components (see gb_CppunitTest_use_components), then
generate a specific static constructor map, directly include it
in the exe's cxx code and then link the minimal dependencies.

The static LO should build on Linux with:
--enable-customtarget-components
--disable-dynamic-loading

Tested VCL plugin config is:
--disable-gtk3
--disable-gen
--enable-qt5

The partial build support is split into a 2nd patch.

Change-Id: Iafc95752fae9e88095f54a21f1e30a4f080815e2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/126790
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>

5 files changed, 92 insertions, 0 deletions

diff --git a/static/CustomTarget_components.mk b/static/CustomTarget_components.mk
new file mode 100644
index 000000000000..510395c9488b
--- /dev/null
+++ b/static/CustomTarget_components.mk
@@ -0,0 +1,37 @@
+# vim: set noet sw=4 ts=4:
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_CustomTarget_CustomTarget,static/components))
+
+static_WORKDIR := $(call gb_CustomTarget_get_workdir,static)
+postprocess_WORKDIR := $(call gb_CustomTarget_get_workdir,postprocess)
+
+$(call gb_CustomTarget_get_target,static/components): \
+    $(static_WORKDIR)/component_maps.cxx \
+
+define gb_static_components_create_component_map
+TEMPFILE=`$(gb_MKTEMP)` && \
+$(call gb_Helper_abbreviate_dirs, \
+    $(call gb_ExternalExecutable_get_command,python) \
+        $(SRCDIR)/solenv/bin/native-code.py -c $(postprocess_WORKDIR)/services_constructors.list \
+) > $$TEMPFILE && \
+$(call gb_Helper_replace_if_different_and_touch,$${TEMPFILE},$(1))
+
+endef
+
+$(static_WORKDIR)/component_maps.cxx: \
+    $(postprocess_WORKDIR)/services_constructors.list \
+    $(SRCDIR)/solenv/bin/native-code.py \
+    $(call gb_ExternalExecutable_get_dependencies,python) \
+    | $(static_WORKDIR)/.dir
+	$(call gb_Output_announce,$(subst $(BUILDDIR)/,,$@),$(true),GEN,2)
+	$(call gb_static_components_create_component_map,$@)
+
+# vim: set noet sw=4:
diff --git a/static/Library_components.mk b/static/Library_components.mk
new file mode 100644
index 000000000000..ae142a30eaee
--- /dev/null
+++ b/static/Library_components.mk
@@ -0,0 +1,18 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t; fill-column: 100 -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_Library_Library,components))
+
+$(eval $(call gb_Library_set_plugin_for,components,cppuhelper))
+
+$(eval $(call gb_Library_add_generated_exception_objects,components,\
+    CustomTarget/static/component_maps \
+))
+
+# vim: set noet sw=4 ts=4:
diff --git a/static/Makefile b/static/Makefile
new file mode 100644
index 000000000000..0c6f47b1790f
--- /dev/null
+++ b/static/Makefile
@@ -0,0 +1,13 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+module_directory:=$(dir $(realpath $(firstword $(MAKEFILE_LIST))))
+
+include $(module_directory)/../solenv/gbuild/partial_build.mk
+
+# vim: set noet sw=4 ts=4:
diff --git a/static/Module_static.mk b/static/Module_static.mk
new file mode 100644
index 000000000000..c6e332b174ca
--- /dev/null
+++ b/static/Module_static.mk
@@ -0,0 +1,20 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+$(eval $(call gb_Module_Module,static))
+
+ifeq ($(ENABLE_CUSTOMTARGET_COMPONENTS),TRUE)
+
+$(eval $(call gb_Module_add_targets,static,\
+    CustomTarget_components \
+    Library_components \
+))
+
+endif
+
+# vim: set noet sw=4 ts=4:
diff --git a/static/README.md b/static/README.md
new file mode 100644
index 000000000000..c150d917ce09
--- /dev/null
+++ b/static/README.md
@@ -0,0 +1,4 @@
+# Static build components library
+
+The library contains a map of all build component names
+to their constructor function calls.