toolchain-external: add a check for unsupported toolchains

Some toolchain can't be used by Buildroot due to sysroot location
issue, so the $(ARCH)-linux-gnu-gcc -print-file-name=libc.a command
return only "libc.a"

This lead to an error during the header check version helper,
so these toolchains can't be imported into Buildroot.

cc1: fatal error: $PWD/libc.a/usr/include/linux/version.h: No such file or directory
compilation terminated.
support/scripts/check-kernel-headers.sh: line 38: /tmp/check-headers.4V5PPF: Permission denied

This issue happen with the first linaro 2015.11 [1] release and
CodeSourcery standard edition [2].

Here is the sysroot directory tree for linaro 2015.11:
$ ls libc/arm-linux-gnueabihf
etc  lib  sbin  usr  var

Here is the sysroot directory tree for CodeSourcery standard:
$ ls libc/sgxx-glibc
etc  lib  lib64  sbin  usr  var

Add a check to error out with an explicit error message

The check don't use toolchain_find_libc_a function directly since
"realpath -f" is used internally and return an absolute path.

[1] https://bugs.linaro.org/show_bug.cgi?id=1995#c7
[2] http://lists.busybox.net/pipermail/buildroot/2014-October/110696.html

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/toolchain/helpers.mk b/toolchain/helpers.mk
index eeac7d2f2931298fa5f799c323266fb9b6cae51b..8aaad67988f845db14194f0ce4b97833e6958243 100644 (file)
--- a/toolchain/helpers.mk
+++ b/toolchain/helpers.mk
@@ -371,6 +371,11 @@ check_unusable_toolchain = \
                echo "and contain a lot of pre-built libraries that would conflict with"; \
                echo "the ones Buildroot wants to build."; \
                exit 1; \
+       fi; \
+       libc_a_path=`$${__CROSS_CC} -print-file-name=libc.a` ; \
+       if test "$${libc_a_path}" = "libc.a" ; then \
+               echo "Unable to detect the toolchain sysroot, Buildroot cannot use this toolchain." ; \
+               exit 1 ; \
        fi
 
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