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tools/Makefile: build host tools with -std=gnu99
Parts of the code are using C99 constructs (such as variables declared inside loops), but also GNU extensions (such as typeof), so using -std=gnu99 is necessary to build with older versions of gcc that don't default to building with gnu99. It fixes the following build failure: ./tools/../lib/crc16.c: In function "crc16_ccitt": ./tools/../lib/crc16.c:70:2: error: "for" loop initial declarations are only allowed in C99 mode for (int i = 0; i < len; i++) ^ ./tools/../lib/crc16.c:70:2: note: use option -std=c99 or -std=gnu99 to compile your code when building the host tools with gcc 4.7. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
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@ -254,7 +254,8 @@ HOST_EXTRACFLAGS += -include $(srctree)/include/compiler.h \
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-I$(srctree)/tools \
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-DUSE_HOSTCC \
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-D__KERNEL_STRICT_NAMES \
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-D_GNU_SOURCE
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-D_GNU_SOURCE \
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-std=gnu99
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__build: $(LOGO-y)
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