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bfin-elf.cmake: set -std=gnu99 for blackfin targets (unsupported gnu11)

--- a/toolchain/common/bfin-elf.cmake

+++ b/toolchain/common/bfin-elf.cmake

@@ -7,7 +7,7 @@

 set(OBJDUMP             bfin-elf-objdump)

 set(SIZE                bfin-elf-size)

-set(CMAKE_C_FLAGS   "${MCPU_FLAGS} -Wall -std=gnu11 -fdata-sections -ffunction-sections" CACHE INTERNAL "c compiler flags")

+set(CMAKE_C_FLAGS   "${MCPU_FLAGS} -Wall -std=gnu99 -fdata-sections -ffunction-sections" CACHE INTERNAL "c compiler flags")

 set(CMAKE_CXX_FLAGS "${MCPU_FLAGS} -Wall -fdata-sections -ffunction-sections" CACHE INTERNAL "cxx compiler flags")

 set(CMAKE_ASM_FLAGS "${MCPU_FLAGS} -x assembler-with-cpp" CACHE INTERNAL "asm compiler flags")

 set(CMAKE_EXE_LINKER_FLAGS "${MCPU_FLAGS} -nostartfiles -Wl,--gc-sections" CACHE INTERNAL "exe link flags")