diff options
authorYann E. MORIN <>2010-04-06 22:50:10 (GMT)
committerPeter Korsgaard <>2010-04-07 07:49:20 (GMT)
commit6db57c69360087b3b7b8fc2b7764d2911ec24d43 (patch)
parent3e7de2af675e24e8a33495ccbd1515854d490122 (diff)
toolchain: fix using external toolchains built with buildroot
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 <> Acked-by: Thomas Petazzoni <> Signed-off-by: Peter Korsgaard <>
2 files changed, 3 insertions, 9 deletions
diff --git a/CHANGES b/CHANGES
index 34f47a0..2ffd672 100644
@@ -4,7 +4,7 @@
Toolchain: uClibc / 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. 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
#1117: Bump nano to 2.2.3 and migrate to
diff --git a/toolchain/external-toolchain/ b/toolchain/external-toolchain/
index 80bdae6..4493281 100644
--- a/toolchain/external-toolchain/
+++ b/toolchain/external-toolchain/
@@ -205,14 +205,7 @@ ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
-# This dance is needed because the toolchain may have been relocated, so the
-# configured paths may no longer match; fortunately, the sysroot moves along
-# the toolchain, so is always at the same place relative to the toolchain's
-# current location.
-CFG_PREFIX_DIR=$(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=$(shell readlink -f $$(LANG=C $(TARGET_CC) -print-file-name=libc.a |sed -r -e 's:usr/lib/libc\.a::;'))
@echo "Checking external toolchain settings"