[Buildroot] [PATCH 1/3] package/Makefile.in: use gcc wrappers for binutils tools

[Norbert Lange]

This will use gcc-ar, gcc-nm and gcc-ranlib instead of the
normal binutils tools. The difference is that with the
wrappers, gcc plugins will be automatically picked up.

I dont think there are any toolchains still supported that
lack those wrappers, so it should be safe to use
unconditionally. Otherwise an option needs to be added.

Note that binutils added some automatic loading with the
'bfd-plugins' directory (somewhere around 2.28), but
the first implementation had issues, and generally depends on
correctly setup symlinks (often broken, may point to some
other gcc's library). The wrappers always work painless.

The original motivation (now ~2 years in use) was to add
"-flto -ffat-lto-objects" to both BR2_TARGET_OPTIMIZATION and
BR2_TARGET_LDFLAGS, and have target binaries lto optimized.

Not all packages will compile with this option, further work
could white/blacklist packages (adding -fno-lto to the
options).

Signed-off-by: Norbert Lange <nolange79 at gmail.com>
---
 package/Makefile.in | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package/Makefile.in b/package/Makefile.in
index 51f5cbce4f..a03f0304d5 100644
--- a/package/Makefile.in
+++ b/package/Makefile.in
@@ -198,15 +198,15 @@ TARGET_CROSS = $(HOST_DIR)/bin/$(TOOLCHAIN_EXTERNAL_PREFIX)-
 endif
 
 # Define TARGET_xx variables for all common binutils/gcc
-TARGET_AR       = $(TARGET_CROSS)ar
+TARGET_AR       = $(TARGET_CROSS)gcc-ar
 TARGET_AS       = $(TARGET_CROSS)as
 TARGET_CC       = $(TARGET_CROSS)gcc
 TARGET_CPP      = $(TARGET_CROSS)cpp
 TARGET_CXX      = $(TARGET_CROSS)g++
 TARGET_FC       = $(TARGET_CROSS)gfortran
 TARGET_LD       = $(TARGET_CROSS)ld
-TARGET_NM       = $(TARGET_CROSS)nm
-TARGET_RANLIB   = $(TARGET_CROSS)ranlib
+TARGET_NM       = $(TARGET_CROSS)gcc-nm
+TARGET_RANLIB   = $(TARGET_CROSS)gcc-ranlib
 TARGET_READELF  = $(TARGET_CROSS)readelf
 TARGET_OBJCOPY  = $(TARGET_CROSS)objcopy
 TARGET_OBJDUMP  = $(TARGET_CROSS)objdump
-- 
2.28.0