On Wed, Dec 2, 2015 at 3:14 AM, Michael Shell <[email protected]>
wrote:

> gcc -x c -v -E /dev/null
>

​For gcc:

COMPILER_PATH=/usr/libexec/gcc/i686-pc-linux-gnu/4.9.2/:/usr/libexec/gcc/i686-pc-linux-gnu/4.9.2/:/usr/libexec/gcc/i686-pc-linux-gnu/:/usr/lib/gcc/i686-pc-linux-gnu/4.9.2/:/usr/lib/gcc/i686-pc-linux-gnu/:/usr/lib/gcc/i686-pc-linux-gnu/4.9.2/../../../../i686-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/lib/gcc/i686-pc-linux-gnu/4.9.2/:/usr/lib/gcc/i686-pc-linux-gnu/4.9.2/../../../../i686-pc-linux-gnu/lib/:/usr/lib/gcc/i686-pc-linux-gnu/4.9.2/../../../:/lib/:/usr/lib/

For clang (I include all output - for you to figure out):
alex[~/work/tests]% clang -x c -v -E /dev/null
clang version 3.5.0 (tags/RELEASE_350/final)
Target: i386-pc-linux-gnu
Thread model: posix
Found candidate GCC installation:
/usr/bin/../lib/gcc/i686-pc-linux-gnu/4.7.0
Found candidate GCC installation:
/usr/bin/../lib/gcc/i686-pc-linux-gnu/4.8.2
Found candidate GCC installation:
/usr/bin/../lib/gcc/i686-pc-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/i686-pc-linux-gnu/4.7.0
Found candidate GCC installation: /usr/lib/gcc/i686-pc-linux-gnu/4.8.2
Found candidate GCC installation: /usr/lib/gcc/i686-pc-linux-gnu/4.9.2
Selected GCC installation: /usr/bin/../lib/gcc/i686-pc-linux-gnu/4.9.2
Candidate multilib: .;@m32
Selected multilib: .;@m32
 "/usr/bin/clang" -cc1 -triple i386-pc-linux-gnu -E -disable-free
-disable-llvm-verifier -main-file-name null -mrelocation-model static
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-fuse-init-array -target-cpu pentium4 -target-linker-version 2.23.2 -v
-dwarf-column-info -resource-dir /usr/bin/../lib/clang/3.5.0
-internal-isystem /usr/local/include -internal-isystem
/usr/bin/../lib/clang/3.5.0/include -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdebug-compilation-dir
/home/alex/work/tests -ferror-limit 19 -fmessage-length 141 -mstackrealign
-fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o - -x c
/dev/null
clang -cc1 version 3.5.0 based upon LLVM 3.5.0 default target
i386-pc-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/bin/../lib/clang/3.5.0/include
 /usr/include
End of search list.
# 1 "/dev/null"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 310 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "/dev/null" 2

Now, I'd appreciate if you wou​ld answer any or all my three questions in
my OP
(hint:  --sysroot).

Thanks,
-- Alex
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