toolchain: expose BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS for all toolchain types

This patch extends the "copy extra GCC libraries to target" feature to
also work for internal toolchains. The variable has been renamed to be
BR2_TOOLCHAIN_EXTRA_LIBS and the configuration option moved under the
generic toolchain package. For external toolchains, the step that does
the copy is still in the copy_toolchain_lib_root() helper which copies
from the sysroot to the target.  For the internal toolchain, the host
gcc-final package does a post install hook to copy the libraries from
the toolchain build folders to both the sysroot and target(!static).

Examples where this can be useful is for adding debug libraries to the
target like the GCC libsanitizer (libasan/liblsan/...).

Cc: Markus Mayer <mmayer@broadcom.com>
Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

Config.in.legacy

@@ -146,6 +146,17 @@ endif
 
 comment "Legacy options removed in 2019.11"
 
+config BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS
+	string "toolchain-external extra libs option has been renamed"
+	help
+	  The option BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS has
+	  been renamed to BR2_TOOLCHAIN_EXTRA_LIBS.
+
+config BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS_WRAP
+	bool
+	default y if BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS != ""
+	select BR2_LEGACY
+
 config BR2_PACKAGE_PYTHON_PYSNMP_APPS
 	bool "python-pysnmp-apps was removed"
 	select BR2_LEGACY

package/gcc/gcc-final/gcc-final.mk

@@ -187,6 +187,8 @@ ifeq ($(BR2_GCC_ENABLE_OPENMP),y)
 HOST_GCC_FINAL_USR_LIBS += libgomp
 endif
 
+HOST_GCC_FINAL_USR_LIBS += $(call qstrip,$(BR2_TOOLCHAIN_EXTRA_LIBS))
+
 ifneq ($(HOST_GCC_FINAL_USR_LIBS),)
 define HOST_GCC_FINAL_INSTALL_STATIC_LIBS
 	for i in $(HOST_GCC_FINAL_USR_LIBS) ; do \

toolchain/Config.in

@@ -221,6 +221,20 @@ config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_LIST
 
 	  Note: the full set of gconv libs are ~8MiB (on ARM).
 
+config BR2_TOOLCHAIN_EXTRA_LIBS
+	string "Extra toolchain libraries to be copied to target"
+	default BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS if BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS != "" # legacy
+	depends on !BR2_STATIC_LIBS
+	help
+	  If your toolchain provides extra libraries that need to be
+	  copied to the target filesystem, enter them here, separated
+	  by spaces. The library should not include a suffix or any
+	  type of pre/post wildcard.
+
+	  Examples where this can be useful is for adding debug
+	  libraries to the target like the GCC libsanitizer.
+	  e.g. "libasan liblsan libtsan libubsan"
+
 # This boolean is true if the toolchain provides a built-in full
 # featured gettext implementation (glibc), and false if only a stub
 # gettext implementation is provided (uclibc, musl)

toolchain/toolchain-external/pkg-toolchain-external.mk

@@ -156,7 +156,7 @@ ifeq ($(BR2_TOOLCHAIN_HAS_DLANG),y)
 TOOLCHAIN_EXTERNAL_LIBS += libgdruntime.so* libgphobos.so*
 endif
 
-TOOLCHAIN_EXTERNAL_LIBS += $(call qstrip,$(BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS))
+TOOLCHAIN_EXTERNAL_LIBS += $(addsuffix .so*,$(call qstrip,$(BR2_TOOLCHAIN_EXTRA_LIBS)))
 
 
 #

toolchain/toolchain-external/toolchain-external-custom/Config.in.options

@@ -438,12 +438,4 @@ config BR2_TOOLCHAIN_EXTERNAL_OPENMP
 	  support. If you don't know, leave the default value,
 	  Buildroot will tell you if it's correct or not.
 
-config BR2_TOOLCHAIN_EXTRA_EXTERNAL_LIBS
-	string "Extra toolchain libraries to be copied to target"
-	help
-	  If your external toolchain provides extra libraries that
-	  need to be copied to the target filesystem, enter them
-	  here, separated by spaces. They will be copied to the
-	  target's /lib directory.
-
 endif