Hello,
I'm trying to use a header only available in GCC in Clang, such as
"backtrace.h", and currently Clang does not add to the search paths the GCC
installation:
-----
root@2b9d90feb564:/opt# echo "#include <backtrace.h>\n void main(){}" |
clang-6.0 -v -xc -
clang version 6.0.1-svn334776-1~exp1~20181018153226.114 (branches/release_60)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.0.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
"/usr/lib/llvm-6.0/bin/clang" -cc1 -triple x86_64-pc-linux-gnu -emit-obj
-mrelax-all -disable-free -disable-llvm-verifier -discard-value-names
-main-file-name - -mrelocation-model static -mthread-model posix
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info
-debugger-tuning=gdb -v -resource-dir /usr/lib/llvm-6.0/lib/clang/6.0.1
-internal-isystem /usr/local/include -internal-isystem
/usr/lib/llvm-6.0/lib/clang/6.0.1/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdebug-compilation-dir /opt
-ferror-limit 19 -fmessage-length 211 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -o /tmp/--b8f5b2.o -x c -
clang -cc1 version 6.0.1 based upon LLVM 6.0.1 default target
x86_64-pc-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib/llvm-6.0/lib/clang/6.0.1/include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
<stdin>:1:23: warning: extra tokens at end of #include directive
[-Wextra-tokens]
#include <backtrace.h>\n void main(){}
^
//
<stdin>:1:10: fatal error: 'backtrace.h' file not found
#include <backtrace.h>\n void main(){}
^~~~~~~~~~~~~
1 warning and 1 error generated.
--------
But in a previous Clang version was working:
--------
root@ca70606af690:/opt# echo "#include <backtrace.h>\n void main(){}" |
clang-6.0 -v -xc -
clang version 6.0.1-svn334776-1~exp1~20180726133222.87 (branches/release_60)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.0.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
"/usr/lib/llvm-6.0/bin/clang" -cc1 -triple x86_64-pc-linux-gnu -emit-obj
-mrelax-all -disable-free -disable-llvm-verifier -discard-value-names
-main-file-name - -mrelocation-model static -mthread-model posix
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info
-debugger-tuning=gdb -v -resource-dir /usr/lib/llvm-6.0/lib/clang/6.0.1
-internal-isystem /usr/local/include -internal-isystem
/usr/lib/llvm-6.0/lib/clang/6.0.1/include -internal-externc-isystem
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.3.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdebug-compilation-dir /opt
-ferror-limit 19 -fmessage-length 211 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -o /tmp/--945497.o -x c -
clang -cc1 version 6.0.1 based upon LLVM 6.0.1 default target
x86_64-pc-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib/llvm-6.0/lib/clang/6.0.1/include
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.3.0/include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
<stdin>:1:23: warning: extra tokens at end of #include directive
[-Wextra-tokens]
#include <backtrace.h>\n void main(){}
^
//
1 warning generated.
------
Of course we could include the header manually, but, is this expected? should
we no longer rely on GCC headers?
Cheers,
Luis
Dr. Luis M. Carril Rodriguez, Senior Software Engineer
luis.carril[at]swarm64.com
Swarm64 AS
Parkveien 41 B | 0258 Oslo | Norway
Registered at Brønnøysundregistrene in Norway under Org.-Number 911 662 787
CEO/Geschäftsführer (Daglig Leder): Dr. Karsten Rönner; Chairman/Vorsitzender
(Styrets Leder): Dr. Sverre Munck
Swarm64 AS Zweigstelle Hive
Ullsteinstr. 120 | 12109 Berlin | Germany
Registered at Amtsgericht Charlottenburg - HRB 154382 B
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