Hi! It seems building of the host compiler requires the offloading compiler to be installed directly in the prefix, which is something really undesirable e.g. for distro builds where things are installed with non-empty $(DESTDIR). Right now it seems that for building all that is needed is main_target_image.h.
Either we can do something like the following patch, i.e. look at -I$(DESTDIR)/$(target_dir)/include first and fall back to -I$(target_dir)/include, which fixed the build for me, but unfortunately it violates GNU conventions: https://www.gnu.org/prep/standards/html_node/DESTDIR.html "DESTDIR should be supported only in the install* and uninstall* targets, as those are the only targets where it is useful." while this patch uses it during build. Another option would be to have two different modes of building --enable-offload-targets= compilers, one where you really have all the offloading target compilers installed (with empty DESTDIR, or initially with non-empty DESTDIR, then somehow (package manager, etc.) copied to the right prefix), and another one where for each offloading target you'd additionally specify the build directory containing non-installed tree (dunno, could be e.g. --enable-offload-targets=x86_64-intelmic-linux-gnu=/some/path,ptx-none=/some/other/path format?) and let the host compiler's build look into the other build trees for what it needs during building and/or testing (for building main_target_image.h should be supposedly all that is needed, for testing perhaps more). Thoughts on this? 2014-09-17 Jakub Jelinek <ja...@redhat.com> * plugin/Makefile.am (libgomp_plugin_mic_la_CPPFLAGS): Use $(DESTDIR)$(target_dir)/include path before trying $(target_dir)/include. * plugin/Makefile.in: Regenerated. --- liboffloadmic/plugin/Makefile.am 2014-09-16 18:16:17.961415565 +0200 +++ liboffloadmic/plugin/Makefile.am 2014-09-17 14:40:26.990566860 +0200 @@ -47,7 +47,7 @@ target_dir = $(libdir)/gcc/$(accel_targe if PLUGIN_HOST toolexeclib_LTLIBRARIES = libgomp-plugin-mic.la libgomp_plugin_mic_la_SOURCES = libgomp-plugin-mic.cpp - libgomp_plugin_mic_la_CPPFLAGS = $(CPPFLAGS) -DLINUX -DCOI_LIBRARY_VERSION=2 -DMYO_SUPPORT -DOFFLOAD_DEBUG=1 -DSEP_SUPPORT -DTIMING_SUPPORT -DHOST_LIBRARY=1 -DMIC_LIB_PATH=\"$(target_dir)\" -I$(coi_inc_dir) -I$(myo_inc_dir) -I$(liboffload_src_dir) -I$(libgomp_dir) -I$(target_dir)/include + libgomp_plugin_mic_la_CPPFLAGS = $(CPPFLAGS) -DLINUX -DCOI_LIBRARY_VERSION=2 -DMYO_SUPPORT -DOFFLOAD_DEBUG=1 -DSEP_SUPPORT -DTIMING_SUPPORT -DHOST_LIBRARY=1 -DMIC_LIB_PATH=\"$(target_dir)\" -I$(coi_inc_dir) -I$(myo_inc_dir) -I$(liboffload_src_dir) -I$(libgomp_dir) -I$(DESTDIR)$(target_dir)/include -I$(target_dir)/include libgomp_plugin_mic_la_LDFLAGS = -L$(liboffload_dir)/.libs -loffloadmic -version-info 1:0:0 else # PLUGIN_TARGET plugin_includedir = $(libsubincludedir) --- liboffloadmic/plugin/Makefile.in 2014-09-16 18:16:17.961415565 +0200 +++ liboffloadmic/plugin/Makefile.in 2014-09-17 14:54:50.555096069 +0200 @@ -277,7 +277,7 @@ libsubincludedir = $(libdir)/gcc/$(targe target_dir = $(libdir)/gcc/$(accel_target)/$(gcc_version) @PLUGIN_HOST_TRUE@toolexeclib_LTLIBRARIES = libgomp-plugin-mic.la @PLUGIN_HOST_TRUE@libgomp_plugin_mic_la_SOURCES = libgomp-plugin-mic.cpp -@PLUGIN_HOST_TRUE@libgomp_plugin_mic_la_CPPFLAGS = $(CPPFLAGS) -DLINUX -DCOI_LIBRARY_VERSION=2 -DMYO_SUPPORT -DOFFLOAD_DEBUG=1 -DSEP_SUPPORT -DTIMING_SUPPORT -DHOST_LIBRARY=1 -DMIC_LIB_PATH=\"$(target_dir)\" -I$(coi_inc_dir) -I$(myo_inc_dir) -I$(liboffload_src_dir) -I$(libgomp_dir) -I$(target_dir)/include +@PLUGIN_HOST_TRUE@libgomp_plugin_mic_la_CPPFLAGS = $(CPPFLAGS) -DLINUX -DCOI_LIBRARY_VERSION=2 -DMYO_SUPPORT -DOFFLOAD_DEBUG=1 -DSEP_SUPPORT -DTIMING_SUPPORT -DHOST_LIBRARY=1 -DMIC_LIB_PATH=\"$(target_dir)\" -I$(coi_inc_dir) -I$(myo_inc_dir) -I$(liboffload_src_dir) -I$(libgomp_dir) -I$(DESTDIR)$(target_dir)/include -I$(target_dir)/include @PLUGIN_HOST_TRUE@libgomp_plugin_mic_la_LDFLAGS = -L$(liboffload_dir)/.libs -loffloadmic -version-info 1:0:0 @PLUGIN_HOST_FALSE@plugin_includedir = $(libsubincludedir) @PLUGIN_HOST_FALSE@plugin_include_HEADERS = main_target_image.h Jakub
