[llvm-dev] [RFH] "cannot apply asm label to function after its first use" on sparc64

[Dimitry Andric via llvm-dev]

On 10 Mar 2021, at 13:13, John Paul Adrian Glaubitz via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> The stage2 builds are failing on the Linux sparc64 CI with an error message that
> I don't really understand [1]:
> 
> FAILED: projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonSymbolizerNoHooks.sparc.dir/sanitizer_stackdepot.cpp.o
> /var/lib/buildbot/workers/debian-stadler-sparc64/clang-sparc64-linux-multistage/stage1.install/bin/clang++ -DHAVE_RPC_XDR_H=1 -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/sanitizer_common -I/var/lib/buildbot/workers/debian-stadler-sparc64/clang-sparc64-linux-multistage/llvm/compiler-rt/lib/sanitizer_common -Iinclude -I/var/lib/buildbot/workers/debian-stadler-sparc64/clang-sparc64-linux-multistage/llvm/llvm/include -I/var/lib/buildbot/workers/debian-stadler-sparc64/clang-sparc64-linux-multistage/llvm/compiler-rt/lib/sanitizer_common/.. -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -fdiagnostics-color -ffunction-sections -fdata-sections -Wall -std=c++14 -Wno-unused-parameter -O3   -m32 -fPIC -fno-builtin -fno-exceptions -fomit-frame-pointer -funwind-tables -fno-stack-protector -fno-sanitize=safe-stack -fvisibility=hidden -fno-lto -O3 -gline-tables-only -Wno-gnu -Wno-variadic-macros -Wno-c99-extensions -nostdinc++ -fno-rtti -Wframe-larger-than=570 -Wglobal-constructors -DSANITIZER_SUPPORTS_WEAK_HOOKS=0 -UNDEBUG -std=c++14 -MD -MT projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonSymbolizerNoHooks.sparc.dir/sanitizer_stackdepot.cpp.o -MF projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonSymbolizerNoHooks.sparc.dir/sanitizer_stackdepot.cpp.o.d -o projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonSymbolizerNoHooks.sparc.dir/sanitizer_stackdepot.cpp.o -c /var/lib/buildbot/workers/debian-stadler-sparc64/clang-sparc64-linux-multistage/llvm/compiler-rt/lib/sanitizer_common/sanitizer_stackdepot.cpp
> In file included from /var/lib/buildbot/workers/debian-stadler-sparc64/clang-sparc64-linux-multistage/llvm/compiler-rt/lib/sanitizer_common/sanitizer_stackdepot.cpp:17:
> In file included from /var/lib/buildbot/workers/debian-stadler-sparc64/clang-sparc64-linux-multistage/llvm/compiler-rt/lib/sanitizer_common/sanitizer_stackdepotbase.h:16:
> In file included from /usr/include/stdio.h:870:
> /usr/include/bits/stdio-ldbl.h:26:20: error: cannot apply asm label to function after its first use
> __LDBL_REDIR_DECL (vfprintf)
> ~~~~~~~~~~~~~~~~~~~^~~~~~~~~
> /usr/include/sys/cdefs.h:467:26: note: expanded from macro '__LDBL_REDIR_DECL'
>  extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name));
>                         ^           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 1 error generated.
> 
> Does anyone have any idea what this error message actually means?

My guess is that the stdio.h declaration conflicts with an earlier one in the sanitizer internal headers, in particular sanitizer_common_interceptors.inc, which has:

...

#ifdef SANITIZER_NLDBL_VERSION
#define COMMON_INTERCEPT_FUNCTION_LDBL(fn)                          \
    COMMON_INTERCEPT_FUNCTION_VER(fn, SANITIZER_NLDBL_VERSION)
#else
#define COMMON_INTERCEPT_FUNCTION_LDBL(fn)                          \
    COMMON_INTERCEPT_FUNCTION(fn)
#endif

...

#if SANITIZER_INTERCEPT_PRINTF
#define INIT_PRINTF                     \
  COMMON_INTERCEPT_FUNCTION_LDBL(printf);    \
  COMMON_INTERCEPT_FUNCTION_LDBL(sprintf);   \
  COMMON_INTERCEPT_FUNCTION_LDBL(snprintf);  \
  COMMON_INTERCEPT_FUNCTION_LDBL(asprintf);  \
  COMMON_INTERCEPT_FUNCTION_LDBL(fprintf);   \
  COMMON_INTERCEPT_FUNCTION_LDBL(vprintf);   \
  COMMON_INTERCEPT_FUNCTION_LDBL(vsprintf);  \
  COMMON_INTERCEPT_FUNCTION_LDBL(vsnprintf); \
  COMMON_INTERCEPT_FUNCTION_LDBL(vasprintf); \
  COMMON_INTERCEPT_FUNCTION_LDBL(vfprintf);
#else
#define INIT_PRINTF
#endif

It would become easier to figure out where the "first use" came from, if you managed to grab the preprocessed version of sanitizer_stackdepot.cpp, for example by adding -save-temps.

-Dimitry

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