From 1247850d44daafa5c7835f26da88e347b330b536 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Sun, 13 Oct 2013 10:28:20 +0200 Subject: [PATCH] toolchain-external: add a specific check to avoid Angstrom toolchains The Angstrom toolchains available at http://www.angstrom-distribution.org/toolchains/ are not usable as external toolchains in Buildroot, because they are not pure toolchains with just the C library, but instead complete SDKs with many cross-compiled libraries (Gtk, Qt, glib, neon, sqlite, X.org, and many more, approximately 200 MB of libraries). Buildroot cannot use such toolchains, and while this is documented in our manual, some users still try to do this. Today, one such user came on the IRC channel, reporting a build problem, which we started investigating, only to realize after a long time that he was using an Angstrom toolchain. To avoid this problem in the future, we explicitly check if the toolchain is from Angstrom by looking at the vendor part of the tuple exposed by the toolchain: as soon as it is -angstrom-, we reject the toolchain with an explanation. Signed-off-by: Thomas Petazzoni Reviewed-by: Thomas De Schampheleire Signed-off-by: Peter Korsgaard --- toolchain/helpers.mk | 18 ++++++++++++++++++ .../toolchain-external/toolchain-external.mk | 1 + 2 files changed, 19 insertions(+) diff --git a/toolchain/helpers.mk b/toolchain/helpers.mk index 95120cd97..a8944ce0f 100644 --- a/toolchain/helpers.mk +++ b/toolchain/helpers.mk @@ -324,3 +324,21 @@ check_cross_compiler_exists = \ echo "Cannot execute cross-compiler '$${__CROSS_CC}'" ; \ exit 1 ; \ fi + +# +# Check for toolchains known not to work with Buildroot. For now, we +# only check for Angstrom toolchains, by looking at the vendor part of +# the host tuple. +# +# $1: cross-gcc path +# +check_unusable_toolchain = \ + __CROSS_CC=$(strip $1) ; \ + vendor=`$${__CROSS_CC} -dumpmachine | cut -f2 -d'-'` ; \ + if test "$${vendor}" = "angstrom" ; then \ + echo "Angstrom toolchains are not pure toolchains: they contain" ; \ + echo "many other libraries than just the C library, which makes" ; \ + echo "them unsuitable as external toolchains for build systems" ; \ + echo "such as Buildroot." ; \ + exit 1 ; \ + fi diff --git a/toolchain/toolchain-external/toolchain-external.mk b/toolchain/toolchain-external/toolchain-external.mk index b5b1ce78a..d41cc7cfc 100644 --- a/toolchain/toolchain-external/toolchain-external.mk +++ b/toolchain/toolchain-external/toolchain-external.mk @@ -371,6 +371,7 @@ endif # type of C library and all C library features. define TOOLCHAIN_EXTERNAL_CONFIGURE_CMDS $(Q)$(call check_cross_compiler_exists,$(TOOLCHAIN_EXTERNAL_CC)) + $(Q)$(call check_unusable_toolchain,$(TOOLCHAIN_EXTERNAL_CC)) $(Q)LIBC_A_LOCATION=`readlink -f $$(LANG=C $(TOOLCHAIN_EXTERNAL_CC) -print-file-name=libc.a)` ; \ SYSROOT_DIR=`echo $${LIBC_A_LOCATION} | sed -r -e 's:(usr/)?lib(32|64)?/(.*/)?libc\.a::'` ; \ if test -z "$${SYSROOT_DIR}" ; then \