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tools/Makefile: build host tools with -std=gnu99

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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>
This commit is contained in:
Thomas Petazzoni 2019-03-30 15:29:23 +01:00 committed by Tom Rini
parent ab8fc41302
commit d7edeba79b
1 changed files with 2 additions and 1 deletions
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3
tools/Makefile
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@ -254,7 +254,8 @@ HOST_EXTRACFLAGS += -include $(srctree)/include/compiler.h \
-I$(srctree)/tools \
-DUSE_HOSTCC \
-D__KERNEL_STRICT_NAMES \
-D_GNU_SOURCE
-D_GNU_SOURCE \
-std=gnu99
__build: $(LOGO-y)