gitolite/buildrootschalter
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toolchain: fix using external toolchains built with buildroot

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The toolchains built with buildroot use specially crafted paths for their
sysroot and prefix. Fix that by asking gcc where it finds a file we
know by relative path to the sysroot.

This has the side effect of greatly simplifying the sysroot detection
in every cases tested so far (BR toolchains, CT-NG toolchains, and
CodeSourcery toolchains).

Fixes bug #851.

Thanks Thomas Petazzoni for the hint and some testings.
Thanks Grant Edwards for the report and the comments.

Signed-off-by: Yann E. MORIN <yann.morin.1998@anciens.enib.fr>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Yann E. MORIN 2010-04-07 00:50:10 +02:00 committed by Peter Korsgaard
parent 3e7de2af67
commit 6db57c6936
2 changed files with 3 additions and 9 deletions
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3
CHANGES
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@ -4,7 +4,7 @@
Toolchain: uClibc 0.9.30.3 / 0.9.31, older 0.9.30.x removed.
2.6.33 kernel headers, binutils 2.20.1, removed broken nios2
support.
support, improved external toolchain support.
X.org updated to 7.5.
@ -23,6 +23,7 @@
#800: [PATCH] iperf update to 2.0.4
#805: [PATCH] mdadm - version update
#817: integrator926_defconfig uses unsupported uboot board name
#851: Add option to specify --sysroot value for external toolchain
#1105: Add new netperf package
#1111: Bump wget to 1.12 and migrate to Makefile.autotools.in
#1117: Bump nano to 2.2.3 and migrate to Makefile.autotools.in

9
toolchain/external-toolchain/ext-tool.mk
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@ -205,14 +205,7 @@ ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
EXTERNAL_LIBS+=libstdc++.so
endif
# This dance is needed because the toolchain may have been relocated, so the
# configured paths may no longer match; fortunately, the sysroot moves along
# the toolchain, so is always at the same place relative to the toolchain's
# current location.
CFG_PREFIX_DIR=$(shell LANG=C $(TARGET_CC) -v 2>&1 | grep ^Configured | tr " " "\n" | grep -- "--prefix=" | cut -f2 -d=)
CFG_SYSROOT_DIR=$(shell LANG=C $(TARGET_CC) -v 2>&1 | grep ^Configured | tr " " "\n" | grep -- "--with-sysroot=" | cut -f2 -d=)
REL_SYSROOT_DIR=$(shell echo "$(CFG_SYSROOT_DIR)" |sed -r -e 's:^$(CFG_PREFIX_DIR)::;')
SYSROOT_DIR=$(TOOLCHAIN_EXTERNAL_PATH)/$(REL_SYSROOT_DIR)
SYSROOT_DIR=$(shell readlink -f $$(LANG=C $(TARGET_CC) -print-file-name=libc.a |sed -r -e 's:usr/lib/libc\.a::;'))
$(STAMP_DIR)/ext-toolchain-installed:
@echo "Checking external toolchain settings"