From c08fa13d363b7e3faa2f065f6261af6fa52445f6 Mon Sep 17 00:00:00 2001 From: Norbert Lange Date: Sun, 18 Oct 2020 00:17:40 +0200 Subject: [PATCH] package/Makefile.in: use gcc wrappers for binutils tools 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. gcc 4.7 introduced these wrappers, to detect the prefix and keep gcc specifics out of Makefile.in, a new variable BR2_TOOLCHAIN_BUTILS_PREFIX will be used to carry the prefix on supported versions. 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 [yann.morin.1998@free.fr: don't introduce a Config.in blind option] Signed-off-by: Yann E. MORIN --- package/Makefile.in | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/package/Makefile.in b/package/Makefile.in index 0ca2a5844e..508ea7c366 100644 --- a/package/Makefile.in +++ b/package/Makefile.in @@ -210,16 +210,23 @@ else TARGET_CROSS = $(HOST_DIR)/bin/$(TOOLCHAIN_EXTERNAL_PREFIX)- endif +# gcc-4.7 and later ships with wrappers that will automatically pass +# arguments to the binutils tools. Those are paths to necessary linker +# plugins. +ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_4_7),y) +TARGET_GCC_WRAPPERS_PREFIX = gcc- +endif + # Define TARGET_xx variables for all common binutils/gcc -TARGET_AR = $(TARGET_CROSS)ar +TARGET_AR = $(TARGET_CROSS)$(TARGET_GCC_WRAPPERS_PREFIX)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 = $(TARGET_CROSS)$(TARGET_GCC_WRAPPERS_PREFIX)nm +TARGET_RANLIB = $(TARGET_CROSS)$(TARGET_GCC_WRAPPERS_PREFIX)ranlib TARGET_READELF = $(TARGET_CROSS)readelf TARGET_OBJCOPY = $(TARGET_CROSS)objcopy TARGET_OBJDUMP = $(TARGET_CROSS)objdump