[libopencm3-devel] Makefile / standards issue building libopencm3

[Warren G. <ve...@gm...>]

When I build the current github release of libopencm3, I obtain the
following build error:

...
  CC      usart_common_v2.c
  CC      i2c_common_v2.c
../common/i2c_common_v2.c: In function 'i2c_transfer7':
../common/i2c_common_v2.c:431:3: error: 'for' loop initial declarations are
only allowed in C99 or C11 mode
   for (size_t i = 0; i < rn; i++) {
   ^
../common/i2c_common_v2.c:431:3: note: use option -std=c99, -std=gnu99,
-std=c11 or -std=gnu11 to compile your code
gmake[2]: *** [../../Makefile.include:45: i2c_common_v2.o] Error 1

*Or more verbosely:*

*arm-none-eabi-gcc* -Os -Wall -Wextra -Wimplicit-function-declaration
-Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes -Wundef -Wshadow
-I../../../include -fno-common -mcpu=cortex-m0  -mthumb -Wstrict-prototypes
-ffunction-sections -fdata-sections -MD -DSTM32F0 -ggdb3  -o
i2c_common_v2.o -c ../common/i2c_common_v2.c
../common/i2c_common_v2.c: In function 'i2c_transfer7':
../common/i2c_common_v2.c:431:3: error: 'for' loop initial declarations are
only allowed in C99 or C11 mode
   for (size_t i = 0; i < rn; i++) {
   ^
../common/i2c_common_v2.c:431:3: note: use option -std=c99, -std=gnu99,
-std=c11 or -std=gnu11 to compile your code
gmake[1]: *** [../../Makefile.include:45: i2c_common_v2.o] Error 1


I am using the following compiler:

$ arm-none-eabi-gcc --version
arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 4.9.3 20150529
(release) [ARM/embedded-4_9-branch revision 224288]

I am able to fix this locally but it would be convenient if this was done
in the repo.

Thanks, Warren