Hi John,
> Building bluez out of git within OpenEmbedded for ARM results in the
> following compilation "error impossible constraint in 'asm'"
>
> arm-poky-linux-gnueabi-gcc -march=armv7-a -marm -mthumb-interwork
> -mfloat-abi=hard -mfpu=neon -mtune=cortex-a8
> --sysroot=/home/johnc/tt/ViciaHeinox/build/tmp/sysroots/trex
> -DHAVE_CONFIG_H -I. -I./lib
> -I/home/johnc/tt/ViciaHeinox/build/tmp/sysroots/trex/usr/include/dbus-1.0
> -I/home/johnc/tt/ViciaHeinox/build/tmp/sysroots/trex/usr/lib/dbus-1.0/include
> -I/home/johnc/tt/ViciaHeinox/build/tmp/sysroots/trex/usr/include/glib-2.0
> -I/home/johnc/tt/ViciaHeinox/build/tmp/sysroots/trex/usr/lib/glib-2.0/include
> -O2 -pipe -g -feliminate-unused-debug-types -c -o
> tools/test-runner.o tools/test-runner.c
>
>
> | tools/test-runner.c: In function 'start_qemu':
> | tools/test-runner.c:224:2: error: impossible constraint in 'asm'
> | __asm__ __volatile__("cpuid" : "=c" (ecx) : "a" (1) : "memory");
> | ^
>
>
> I believe this was introduced with this commit....
>
> commit a0a03828fbc49db9f0926cee87d53d627d69bac2
> Author: Marcel Holtmann <marcel@xxxxxxxxxxxx>
> Date: Mon Apr 6 20:45:39 2015 -0700
>
> tools: Add fallback if KVM support is not available
>
> diff --git a/tools/test-runner.c b/tools/test-runner.c
> index 407a985..163b610 100644
> --- a/tools/test-runner.c
> +++ b/tools/test-runner.c
> @@ -195,7 +195,7 @@ static char *const qemu_argv[] = {
> "-no-user-config",
> "-monitor", "none",
> "-display", "none",
> - "-machine", "type=q35,accel=kvm",
> + "-machine", "type=q35,accel=kvm:tcg",
> "-m", "192M",
> "-nographic",
> "-vga", "none",
> @@ -215,6 +215,16 @@ static char *const qemu_envp[] = {
> NULL
> };
>
> +static void check_virtualization(void)
> +{
> + uint32_t ecx;
> +
> + __asm__ __volatile__("cpuid" : "=c" (ecx) : "a" (1) : "memory");
> +
> + if (!!(ecx & (1 << 5)))
> + printf("Found support for Virtual Machine eXtensions\n");
> +}
> +
just make this check IA specific so that on ARM architectures it compiles to nothing.
Regards
Marcel
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