busybox: make sure architecture flags are used at link time
When compiling Busybox, according to readelf -A, all object files were properly compiled according to the select architecture (-march=armv4t for example), but the final busybox binary could be of a different architecture (ARMv5t even if ARMv4t was selected). This patch changes the way we configure/compile Busybox so that our CFLAGS aren't anymore passed through the make EXTRA_CFLAGS variable, but through the .config CONFIG_EXTRA_CFLAGS variable. Unfortunately, those variables don't have exactly the same semantic for the Busybox build system. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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@ -47,6 +47,7 @@ CONFIG_FEATURE_SYSLOG=y
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# CONFIG_FEATURE_SHARED_BUSYBOX is not set
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# CONFIG_LFS is not set
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CONFIG_CROSS_COMPILER_PREFIX=""
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CONFIG_EXTRA_CFLAGS=""
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#
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# Debugging Options
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@ -45,6 +45,8 @@ $(BUSYBOX_DIR)/.config: $(BUSYBOX_DIR)/.unpacked $(BUSYBOX_CONFIG_FILE)
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cp -f $(BUSYBOX_CONFIG_FILE) $(BUSYBOX_DIR)/.config
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$(SED) s,^CONFIG_PREFIX=.*,CONFIG_PREFIX=\"$(TARGET_DIR)\", \
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$(BUSYBOX_DIR)/.config
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$(SED) 's,^CONFIG_EXTRA_CFLAGS=.*,CONFIG_EXTRA_CFLAGS=\"$(BUSYBOX_CFLAGS)\",' \
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$(BUSYBOX_DIR)/.config
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# id applet breaks on >=1.13.0 with old uclibc unless the bb pwd routines are used
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ifeq ($(BR2_BUSYBOX_VERSION_1_13_X)$(BR2_BUSYBOX_VERSION_1_14_X)$(BR2_UCLIBC_VERSION_0_9_28_3)$(BR2_UCLIBC_VERSION_0_9_29),yy)
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if grep -q 'CONFIG_ID=y' $(BUSYBOX_DIR)/.config; \
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@ -105,15 +107,13 @@ endif
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$(BUSYBOX_DIR)/busybox: $(BUSYBOX_DIR)/.config
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$(MAKE) CC=$(TARGET_CC) CROSS_COMPILE="$(TARGET_CROSS)" \
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CROSS="$(TARGET_CROSS)" PREFIX="$(TARGET_DIR)" \
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ARCH=$(KERNEL_ARCH) \
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EXTRA_CFLAGS="$(BUSYBOX_CFLAGS)" -C $(BUSYBOX_DIR)
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ARCH=$(KERNEL_ARCH) -C $(BUSYBOX_DIR)
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$(TARGET_DIR)/bin/busybox: $(BUSYBOX_DIR)/busybox
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ifeq ($(BR2_PACKAGE_BUSYBOX_FULLINSTALL),y)
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$(MAKE) CC=$(TARGET_CC) CROSS_COMPILE="$(TARGET_CROSS)" \
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CROSS="$(TARGET_CROSS)" PREFIX="$(TARGET_DIR)" \
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ARCH=$(KERNEL_ARCH) \
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EXTRA_CFLAGS="$(BUSYBOX_CFLAGS)" -C $(BUSYBOX_DIR) install
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ARCH=$(KERNEL_ARCH) -C $(BUSYBOX_DIR) install
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else
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install -D -m 0755 $(BUSYBOX_DIR)/busybox $(TARGET_DIR)/bin/busybox
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endif
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