diff options
Diffstat (limited to 'toolchain.inc')
| -rw-r--r-- | toolchain.inc | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/toolchain.inc b/toolchain.inc index 89bc55c6bb..eea0560328 100644 --- a/toolchain.inc +++ b/toolchain.inc @@ -74,6 +74,24 @@ CFLAGS_riscv += -ffunction-sections -fdata-sections CFLAGS_x86_64 += -mcmodel=large -mno-red-zone +# Some boards only provide 2K stacks, so storing lots of data there leads to +# problems. Since C rules don't allow us to statically determine the maximum +# stack use, we use 1.5K as heuristic, assuming that we typically have lots +# of tiny stack frames and the odd large one. +# +# Store larger buffers in BSS, use MAYBE_STATIC to share code with __PRE_RAM__ +# on x86. +# Since GCCs detection of dynamic array bounds unfortunately seems to be +# very basic, you'll sometimes have to use a static upper bound for the +# size and an assert() to make sure it's honored (see gpio_base3_value() +# for an example). +# (If you absolutely need a larger stack frame and are 100% sure it cannot +# cause problems, you can whitelist it with #pragma diagnostic.) +CFLAGS_arm += -Wstack-usage=1536 +CFLAGS_arm64 += -Wstack-usage=1536 +CFLAGS_mips += -Wstack-usage=1536 +CFLAGS_riscv += -Wstack-usage=1536 + toolchain_to_dir = \ $(foreach arch,$(ARCH_SUPPORTED),\ $(eval CPPFLAGS_$(arch) += \ |