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8f0c68a7a6
W/o that hack target GCC assume existence of per-mcpu folders,
which are missing.
In particular G++ failed to find "bits/c++config.h":
------------------>8------------------
root@hsdk:~# cat test.cc
#include <cstdlib>
int myfunc(void)
{
}
root@hsdk:~# g++ -c test.cc -v
Using built-in specs.
COLLECT_GCC=g++
Target: arc-oe-linux
Configured with: ../../../../../../work-shared/gcc-11.1.0-r0/gcc-11.1.0/configure --build=x86_64-linux --host=arc-oe-linux --target=arc-oe-linux --prefix=/usr --exec_prefix=/usr -x
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.1.1 20210523 (GCC)
COLLECT_GCC_OPTIONS='-c' '-v' '-shared-libgcc' '-mcpu=hs38_linux'
/usr/libexec/gcc/arc-oe-linux/11.1.1/cc1plus -quiet -v -imultilib hs38_linux -D_GNU_SOURCE test.cc -quiet -dumpbase test.cc -dumpbase-ext .cc -mcpu=hs38_linux -version -o /tmp/ccs
GNU C++17 (GCC) version 11.1.1 20210523 (arc-oe-linux)
compiled by GNU C version 11.1.1 20210523, GMP version 6.2.1, MPFR version 4.1.0, MPC version 1.2.1, isl version none
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129242
ignoring nonexistent directory "/usr/lib/gcc/arc-oe-linux/11.1.1/../../../../include/c++/11.1.1/arc-oe-linux/hs38_linux"
ignoring nonexistent directory "/usr/lib/arc-oe-linux/11.1.1/include"
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/lib/gcc/arc-oe-linux/11.1.1/../../../../arc-oe-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/arc-oe-linux/11.1.1/../../../../include/c++/11.1.1
/usr/lib/gcc/arc-oe-linux/11.1.1/../../../../include/c++/11.1.1/backward
/usr/lib/gcc/arc-oe-linux/11.1.1/include
/usr/lib/gcc/arc-oe-linux/11.1.1/include-fixed
/usr/include
End of search list.
GNU C++17 (GCC) version 11.1.1 20210523 (arc-oe-linux)
compiled by GNU C version 11.1.1 20210523, GMP version 6.2.1, MPFR version 4.1.0, MPC version 1.2.1, isl version none
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129242
Compiler executable checksum: 6df2f07a822bfbbb80a61414b712b75d
In file included from test.cc:1:
/usr/include/c++/11.1.1/cstdlib:41:10: fatal error: bits/c++config.h: No such file or directory
41 | #include <bits/c++config.h>
| ^~~~~~~~~~~~~~~~~~
compilation terminated.
------------------>8------------------
Note "ignoring nonexistent directory "/usr/lib/gcc/arc-oe-linux/11.1.1/../../../../include/c++/11.1.1/arc-oe-linux/hs38_linux"
message which is being used by GCC due to the fact of implicit "-mcpu=hs38_linux".
In fact this header "bits/c++config.h" is located in "/usr/lib/gcc/arc-oe-linux/11.1.1/../../../../include/c++/11.1.1/arc-oe-linux"
on target.
(From OE-Core rev: fbdc4422361a520af458468d836a8e4159dc22d6)
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.