[Buildroot] [PATCH 1/1] toolchain-external-custom: allow specifying relative path to binaries

[Calin Crisan <ccrisan@gmail.com>]

There are cases where a downloaded toolchain doesn't have its binaries
placed directly in a "bin" subfolder (where BuildRoot currently looks
for them).

A common example is the official Raspberry Pi Toolchain
(https://github.com/raspberrypi/tools), which has its binaries in
"arm-bcm2708/arm-linux-gnueabihf/bin".

This commit introduces BR2_TOOLCHAIN_EXTERNAL_BIN_PATH that defaults
to "bin" and can be changed as needed.

Signed-off-by: Calin Crisan <ccrisan@gmail.com>
---
 toolchain/toolchain-external/pkg-toolchain-external.mk            | 2 +-
 .../toolchain-external-custom/Config.in.options                   | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/toolchain/toolchain-external/pkg-toolchain-external.mk b/toolchain/toolchain-external/pkg-toolchain-external.mk
index 3bf9fac412..4dfe3815ae 100644
--- a/toolchain/toolchain-external/pkg-toolchain-external.mk
+++ b/toolchain/toolchain-external/pkg-toolchain-external.mk
@@ -77,7 +77,7 @@ ifneq ($(TOOLCHAIN_EXTERNAL_PREFIX),)
 TOOLCHAIN_EXTERNAL_BIN := $(dir $(shell which $(TOOLCHAIN_EXTERNAL_PREFIX)-gcc))
 endif
 else
-TOOLCHAIN_EXTERNAL_BIN = $(TOOLCHAIN_EXTERNAL_INSTALL_DIR)/bin
+TOOLCHAIN_EXTERNAL_BIN = $(TOOLCHAIN_EXTERNAL_INSTALL_DIR)/$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_BIN_PATH))
 endif
 
 # If this is a buildroot toolchain, it already has a wrapper which we want to
diff --git a/toolchain/toolchain-external/toolchain-external-custom/Config.in.options b/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
index 70c7d8e3c3..bb199aab85 100644
--- a/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
+++ b/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
@@ -12,6 +12,14 @@ config BR2_TOOLCHAIN_EXTERNAL_URL
 	help
 	  URL of the custom toolchain tarball to download and install.
 
+config BR2_TOOLCHAIN_EXTERNAL_BIN_PATH
+    string "Toolchain bin path"
+    default "bin"
+    depends on BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD
+    help
+      Path to where the binaries (e.g. the compiler) can be found,
+      relative to the downloaded toolchain root directory.
+
 config BR2_TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX
 	string "Toolchain prefix"
 	default "$(ARCH)-linux"
-- 
2.16.2