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Adding -fstrict-volatile-bitfields to the CFLAGS/CXXFLAGS. Without this, gcc tries to access bitfields using the smallest possible methods (eg l8i to

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grab an 8-bit field from a 32-bit). Our hardware does not like that. This flag tells gcc that if a bitfield is volatile, it should always use the type
the field is defined at (uint32_t in our case) to size its access to the field. This fixes accessing the hardware through the xxx_struct.h headers.
This commit is contained in:
Jeroen Domburg 2016-09-18 12:10:01 +08:00
parent 489b4f31a9
commit f703acd344
1 changed files with 4 additions and 3 deletions
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7
make/project.mk
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@ -158,13 +158,14 @@ LDFLAGS ?= -nostdlib \
# files, set CFLAGS += in your component's Makefile.projbuild
# CPPFLAGS used by an compile pass that uses the C preprocessor
CPPFLAGS = -DESP_PLATFORM -Og -g3 -Wpointer-arith -Werror -Wno-error=unused-function -Wno-error=unused-but-set-variable -Wno-error=unused-variable -Wall -ffunction-sections -fdata-sections -mlongcalls -nostdlib -MMD -MP
CPPFLAGS = -DESP_PLATFORM -Og -g3 -Wpointer-arith -Werror -Wno-error=unused-function -Wno-error=unused-but-set-variable \
-Wno-error=unused-variable -Wall -ffunction-sections -fdata-sections -mlongcalls -nostdlib -MMD -MP
# C flags use by C only
CFLAGS = $(CPPFLAGS) -std=gnu99 -g3 -fno-inline-functions
CFLAGS = $(CPPFLAGS) -std=gnu99 -g3 -fstrict-volatile-bitfields
# CXXFLAGS uses by C++ only
CXXFLAGS = $(CPPFLAGS) -Og -std=gnu++11 -g3 -fno-exceptions
CXXFLAGS = $(CPPFLAGS) -Og -std=gnu++11 -g3 -fno-exceptions -fstrict-volatile-bitfields
export CFLAGS CPPFLAGS CXXFLAGS