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toolchain: generate a gdbinit file

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This commit slightly improves the external toolchain backend, and the
gdb build logic to create a file named
$(STAGING_DIR)/usr/share/buildroot/gdbinit which can be used as a
gdbinit file using gdb -x option. This allows gdb to automatically use
the proper sysroot to find libraries.

The initial insight for this patch comes from the report of Oded
Hanson <OHanson@xsightsys.com>, who found an issue with the Eclipse
Buildroot plugin, which was setting a solib-path in gdb, but not a
sysroot. Setting a solib-path was enough to find shared libraries, but
not the dynamic linker. And since Eclipse doesn't allow to set the
sysroot in any other way than giving a gdbinit file, it makes sense to
have Buildroot generate a gdbinit file (which can be used in other
situations than Eclipse).

To achieve this, this commit introduces a gen_gdbinit_file helper in
toolchain/helpers.mk, and uses it for the internal toolchain and
external toolchain backends.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
[ThomasDS: minor updates in commit message]
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2014-05-05 11:25:50 +02:00 committed by Peter Korsgaard
parent 948b963d1b
commit 7130ceb267
3 changed files with 16 additions and 0 deletions
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2
package/gdb/gdb.mk
View File

@ -126,5 +126,7 @@ endef
HOST_GDB_POST_INSTALL_HOOKS += HOST_GDB_ADD_SYMLINK
HOST_GDB_POST_INSTALL_HOOKS += gen_gdbinit_file
$(eval $(autotools-package))
$(eval $(host-autotools-package))

7
toolchain/helpers.mk
View File

@ -355,3 +355,10 @@ check_unusable_toolchain = \
echo "such as Buildroot." ; \
exit 1 ; \
fi
#
# Generate gdbinit file for use with Buildroot
#
gen_gdbinit_file = \
mkdir -p $(STAGING_DIR)/usr/share/buildroot/ ; \
echo "set sysroot $(STAGING_DIR)" > $(STAGING_DIR)/usr/share/buildroot/gdbinit

7
toolchain/toolchain-external/toolchain-external.mk
View File

@ -651,6 +651,12 @@ define TOOLCHAIN_EXTERNAL_SANITIZE_KERNEL_HEADERS
-e 's@#(ifndef|define|endif[ \t]*/[*])[ \t]*_UAPI@#\1 @'
endef
define TOOLCHAIN_EXTERNAL_INSTALL_GDBINIT
if test -f $(TARGET_CROSS)gdb ; then \
$(call gen_gdbinit_file) ; \
fi
endef
# Even though we're installing things in both the staging, the host
# and the target directory, we do everything within the
# install-staging step, arbitrarily.
@ -659,6 +665,7 @@ define TOOLCHAIN_EXTERNAL_INSTALL_STAGING_CMDS
$(TOOLCHAIN_EXTERNAL_INSTALL_BFIN_FDPIC)
$(TOOLCHAIN_EXTERNAL_INSTALL_BFIN_FLAT)
$(TOOLCHAIN_EXTERNAL_INSTALL_WRAPPER)
$(TOOLCHAIN_EXTERNAL_INSTALL_GDBINIT)
endef
$(eval $(generic-package))