[edk2-devel] [PATCH v2 6/7] BaseTools/tools_def CLANG3x ARM AARCH64: force use of C99 standard

[Ard Biesheuvel]

On Tue, 28 May 2019 at 02:17, Liming Gao <liming.gao at intel.com> wrote:
>
> Ard:
>   Is there any impact with new option? If no behavior change, I am OK for this patch. Reviewed-by: Liming Gao <liming.gao at intel.com>
>

We don't rely on anything provided by the C11 standard, so it should
not result in a behavior change. I do wonder whether x86 may be
affected as well, though.

Jian, did you try building OpenSSL 1.1.1b for x86 with the CLANG38
toolchain with a recent version of Clang?



> >-----Original Message-----
> >From: Ard Biesheuvel [mailto:ard.biesheuvel at linaro.org]
> >Sent: Tuesday, May 28, 2019 4:52 AM
> >To: devel at edk2.groups.io
> >Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org>; Laszlo Ersek
> ><lersek at redhat.com>; Gao, Liming <liming.gao at intel.com>; Wang, Jian J
> ><jian.j.wang at intel.com>; Leif Lindholm <leif.lindholm at linaro.org>; Kinney,
> >Michael D <michael.d.kinney at intel.com>
> >Subject: [PATCH v2 6/7] BaseTools/tools_def CLANG3x ARM AARCH64: force
> >use of C99 standard
> >
> >When building OpenSSL for ARM or AARCH64 with recent Clang, the following
> >error may result:
> >
> >  In file included
> >from .../CryptoPkg/Library/BaseCryptLib/Pk/CryptPkcs7VerifyEku.c:18:
> >  In file included
> >from .../CryptoPkg/Library/OpensslLib/openssl/crypto/include/internal/x509_
> >int.h:10:
> >  In file included
> >from .../CryptoPkg/Library/OpensslLib/openssl/include/internal/refcount.h:2
> >1:
> >  In file included from /usr/lib/llvm-7/lib/clang/7.0.1/include/stdatomic.h:35:
> >  In file included from /usr/lib/llvm-7/lib/clang/7.0.1/include/stdint.h:61:
> >  /usr/include/stdint.h:26:10: fatal error: 'bits/libc-header-start.h' file not
> >found
> >  #include <bits/libc-header-start.h>
> >         ^~~~~~~~~~~~~~~~~~~~~~~~~~
> >  1 error generated.
> >
> >This is caused by the fact that the refcount.h header includes compiler
> >headers that in turn rely on system headers, which we don't support.
> >
> >Since the C native atomics are a C11 feature, let's explicitly use the
> >C99 standard instead to work around this issue.
> >
> >Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
> >---
> > BaseTools/Conf/tools_def.template | 8 ++++----
> > 1 file changed, 4 insertions(+), 4 deletions(-)
> >
> >diff --git a/BaseTools/Conf/tools_def.template
> >b/BaseTools/Conf/tools_def.template
> >index 26a2cf604f74..7fe6f4406a72 100755
> >--- a/BaseTools/Conf/tools_def.template
> >+++ b/BaseTools/Conf/tools_def.template
> >@@ -2280,8 +2280,8 @@ DEFINE CLANG35_ARM_TARGET        = -target arm-
> >linux-gnueabi
> > DEFINE CLANG35_AARCH64_TARGET    = -target aarch64-linux-gnu
> >
> > DEFINE CLANG35_WARNING_OVERRIDES = -Wno-parentheses-equality -
> >Wno-tautological-compare -Wno-tautological-constant-out-of-range-compare
> >-Wno-empty-body -Wno-unknown-warning-option
> >-DEFINE CLANG35_ARM_CC_FLAGS      = DEF(GCC_ARM_CC_FLAGS)
> >DEF(CLANG35_ARM_TARGET) DEF(CLANG35_WARNING_OVERRIDES)
> >-DEFINE CLANG35_AARCH64_CC_FLAGS  = DEF(GCC_AARCH64_CC_FLAGS)
> >DEF(CLANG35_AARCH64_TARGET) -mcmodel=small
> >DEF(CLANG35_WARNING_OVERRIDES)
> >+DEFINE CLANG35_ARM_CC_FLAGS      = DEF(GCC_ARM_CC_FLAGS)
> >DEF(CLANG35_ARM_TARGET) DEF(CLANG35_WARNING_OVERRIDES) -
> >std=c99
> >+DEFINE CLANG35_AARCH64_CC_FLAGS  = DEF(GCC_AARCH64_CC_FLAGS)
> >DEF(CLANG35_AARCH64_TARGET) -mcmodel=small
> >DEF(CLANG35_WARNING_OVERRIDES) -std=c99
> >
> > ##################
> > # CLANG35 ARM definitions
> >@@ -2430,7 +2430,7 @@ NOOPT_CLANG38_X64_DLINK2_FLAGS     =
> >DEF(GCC5_X64_DLINK2_FLAGS) -O0
> > # CLANG38 ARM definitions
> > ##################
> > DEFINE CLANG38_ARM_TARGET        = -target arm-linux-gnueabi
> >-DEFINE CLANG38_ARM_CC_FLAGS      = DEF(GCC_ARM_CC_FLAGS)
> >DEF(CLANG38_ARM_TARGET) DEF(CLANG38_WARNING_OVERRIDES) -mno-
> >movt
> >+DEFINE CLANG38_ARM_CC_FLAGS      = DEF(GCC_ARM_CC_FLAGS)
> >DEF(CLANG38_ARM_TARGET) DEF(CLANG38_WARNING_OVERRIDES) -mno-
> >movt -std=c99
> > DEFINE CLANG38_ARM_DLINK_FLAGS   = DEF(CLANG38_ARM_TARGET)
> >DEF(GCC_ARM_DLINK_FLAGS)
> >
> > *_CLANG38_ARM_PP_FLAGS           = DEF(GCC_PP_FLAGS)
> >@@ -2474,7 +2474,7 @@ RELEASE_CLANG38_ARM_DLINK_FLAGS  =
> >DEF(CLANG38_ARM_DLINK_FLAGS) -flto -Wl,-O3 -L
> > # CLANG38 AARCH64 definitions
> > ##################
> > DEFINE CLANG38_AARCH64_TARGET    = -target aarch64-linux-gnu
> >-DEFINE CLANG38_AARCH64_CC_FLAGS  = DEF(GCC_AARCH64_CC_FLAGS)
> >DEF(CLANG38_AARCH64_TARGET) -mcmodel=small
> >DEF(CLANG38_WARNING_OVERRIDES)
> >+DEFINE CLANG38_AARCH64_CC_FLAGS  = DEF(GCC_AARCH64_CC_FLAGS)
> >DEF(CLANG38_AARCH64_TARGET) -mcmodel=small
> >DEF(CLANG38_WARNING_OVERRIDES) -std=c99
> > DEFINE CLANG38_AARCH64_DLINK_FLAGS  =
> >DEF(CLANG38_AARCH64_TARGET) DEF(GCC_AARCH64_DLINK_FLAGS) -z
> >common-page-size=0x1000
> >
> > *_CLANG38_AARCH64_PP_FLAGS       = DEF(GCC_PP_FLAGS)
> >--
> >2.20.1
>
>
> 
>

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