Leif, FYI, the char sign issue clang hit recently was due to mixing edk2 types with standard C type. The edk2 type system does not assume that char is signed or unsigned.
MdePkg/Include/X64/ProcessorBind.h /// /// 1-byte unsigned value /// typedef unsigned char UINT8; /// /// 1-byte Character /// typedef char CHAR8; /// /// 1-byte signed value /// typedef signed char INT8; Thanks, Andrew Fish > On Mar 17, 2016, at 6:22 AM, Leif Lindholm <[email protected]> wrote: > > By default, the ARM architectures have unsigned chars, whereas the other > architectures supported by EDK2 by default have signed chars. > However, EDK2 uses -funsigned-chars on those architectures to change the > default behaviour. > > Unfortunately, the ARM architectures explicitly break their default > behaviour by specifying -fsigned-chars (I presume in a pre-emptive > attempt at avoiding incompatibility). > > Since this situation is already confusing enough, switch the ARM > architectures to also specify -funsigned-chars explicitly rather than > just dropping the current parameter. > > Contributed-under: TianoCore Contribution Agreement 1.0 > Signed-off-by: Leif Lindholm <[email protected]> > --- > BaseTools/Conf/tools_def.template | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/BaseTools/Conf/tools_def.template > b/BaseTools/Conf/tools_def.template > index b1577af..eedf80f 100644 > --- a/BaseTools/Conf/tools_def.template > +++ b/BaseTools/Conf/tools_def.template > @@ -4322,8 +4322,8 @@ DEFINE GCC_ALL_CC_FLAGS = -g -Os > -fshort-wchar -fno-strict-aliasing - > DEFINE GCC_IA32_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -m32 > -malign-double -freorder-blocks -freorder-blocks-and-partition -O2 > -mno-stack-arg-probe > DEFINE GCC_X64_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mno-red-zone > -Wno-address -mno-stack-arg-probe > DEFINE GCC_IPF_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) > -minline-int-divide-min-latency > -DEFINE GCC_ARM_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mlittle-endian > -mabi=aapcs -fno-short-enums -save-temps -fsigned-char -ffunction-sections > -fdata-sections -fomit-frame-pointer -Wno-address -mthumb -mfloat-abi=soft > -DEFINE GCC_AARCH64_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mlittle-endian > -fno-short-enums -save-temps -fverbose-asm -fsigned-char -ffunction-sections > -fdata-sections -fomit-frame-pointer -fno-builtin -Wno-address > -fno-asynchronous-unwind-tables > +DEFINE GCC_ARM_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mlittle-endian > -mabi=aapcs -fno-short-enums -save-temps -funsigned-char -ffunction-sections > -fdata-sections -fomit-frame-pointer -Wno-address -mthumb -mfloat-abi=soft > +DEFINE GCC_AARCH64_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mlittle-endian > -fno-short-enums -save-temps -fverbose-asm -funsigned-char > -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-builtin > -Wno-address -fno-asynchronous-unwind-tables > DEFINE GCC_AARCH64_CC_XIPFLAGS = -mstrict-align > DEFINE GCC_DLINK_FLAGS_COMMON = -nostdlib --pie > DEFINE GCC_DLINK2_FLAGS_COMMON = > --script=$(EDK_TOOLS_PATH)/Scripts/GccBase.lds > -- > 2.1.4 > > _______________________________________________ > edk2-devel mailing list > [email protected] > https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
