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3e56ca6d0a
* it will try to link with librt from host and if you have it on host (libc6-dev-i386 in ubuntu) it fails with: /usr/lib32/librt.so: error: undefined reference to '__clock_settime', version 'GLIBC_PRIVATE' /usr/lib32/librt.so: error: undefined reference to '__clock_getcpuclockid', version 'GLIBC_PRIVATE' /usr/lib32/librt.so: error: undefined reference to '__clock_getres', version 'GLIBC_PRIVATE' /usr/lib32/librt.so: error: undefined reference to '__clock_nanosleep', version 'GLIBC_PRIVATE' collect2: error: ld returned 1 exit status in older 3.6.14 it was using /usr/lib32/librt.so from host as well, but without do_compile failing configure:17539: checking for librt configure:17563: i686-oe-linux-gcc -m32 -march=core2 -mtune=core2 -msse3 -mfpmath=sse -fstack-protector-strong -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Werror=return-type --sysroot=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.14-r0/recipe-sysroot -o conftest -O2 -pipe -g -feliminate-unused-debug-types -fmacro-prefix-map=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.14-r0=/usr/src/debug/gnutls/3.6.14-r0 -fdebug-prefix-map=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.14-r0=/usr/src/debug/gnutls/3.6.14-r0 -fdebug-prefix-map=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.14-r0/recipe-sysroot= -fdebug-prefix-map=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.14-r0/recipe-sysroot-native= -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,-z,relro,-z,now conftest.c /usr/lib32/librt.so >&5 configure:17563: $? = 0 configure:17573: result: yes configure:17580: checking how to link with librt configure:17582: result: /usr/lib32/librt.so with --with-librt-prefix passed, it finds the right one as shown in build/config.log: configure:17551: checking for librt configure:17575: i686-oe-linux-gcc -m32 -march=core2 -mtune=core2 -msse3 -mfpmath=sse -fstack-protector-strong -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Werror=return-type --sysroot=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.15-r0/recipe-sysroot -o conftest -O2 -pipe -g -feliminate-unused-debug-types -fmacro-prefix-map=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.15-r0=/usr/src/debug/gnutls/3.6.15-r0 -fdebug-prefix-map=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.15-r0=/usr/src/debug/gnutls/3.6.15-r0 -fdebug-prefix-map=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.15-r0/recipe-sysroot= -fdebug-prefix-map=/tmpdir/work/qemux86-oe-linux/gnutls/3.6.15-r0/recipe-sysroot-native= -I/tmpdir/work/qemux86-oe-linux/gnutls/3.6.15-r0/recipe-sysroot/usr/include -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,-z,relro,-z,now conftest.c /tmpdir/work/qemux86-oe-linux/gnutls/3.6.15-r0/recipe-sysroot/usr/lib/librt.so >&5 configure:17575: $? = 0 configure:17585: result: yes configure:17592: checking how to link with librt configure:17594: result: /tmpdir/work/qemux86-oe-linux/gnutls/3.6.15-r0/recipe-sysroot/usr/lib/librt.so (From OE-Core rev: d355cd38904460f3add2b0b9477e8ddfd42b22e1) Signed-off-by: Martin Jansa <Martin.Jansa@gmail.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.