| Message ID | 1413749285-1108-28-git-send-email-thomas.petazzoni@free-electrons.com |
|---|---|
| State | Accepted |
| Commit | 75418c4cf678a3c34352bd7a781296937815681d |
| Headers | show |
Thomas, All, On 2014-10-19 22:08 +0200, Thomas Petazzoni spake thusly: > According to the gcc documentation for PowerPC options: > > '-mtune=CPU_TYPE' > Set the instruction scheduling parameters for machine type > CPU_TYPE, but do not set the architecture type, register usage, or > choice of mnemonics, as '-mcpu=CPU_TYPE' would. The same values > for CPU_TYPE are used for '-mtune' as for '-mcpu'. If both are > specified, the code generated will use the architecture, registers, > and mnemonics set by '-mcpu', but the scheduling parameters set by > '-mtune'. > > In the case of Buildroot where we only target a specific system, using > -mtune therefore doesn't make much sense, and using -mcpu would be > more appropriate. As a consequence, this patch makes PowerPC use > BR2_GCC_TARGET_CPU instead of BR2_GCC_TARGET_TUNE. > > Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Regards, Yann E. MORIN. > --- > arch/Config.in.powerpc | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/Config.in.powerpc b/arch/Config.in.powerpc > index 239f5dc..fabee9f 100644 > --- a/arch/Config.in.powerpc > +++ b/arch/Config.in.powerpc > @@ -160,7 +160,7 @@ config BR2_ENDIAN > config BR2_ARCH_HAS_ATOMICS > default y > > -config BR2_GCC_TARGET_TUNE > +config BR2_GCC_TARGET_CPU > default "401" if BR2_powerpc_401 > default "403" if BR2_powerpc_403 > default "405" if BR2_powerpc_405 > -- > 2.0.0 > > _______________________________________________ > buildroot mailing list > buildroot@busybox.net > http://lists.busybox.net/mailman/listinfo/buildroot
diff --git a/arch/Config.in.powerpc b/arch/Config.in.powerpc index 239f5dc..fabee9f 100644 --- a/arch/Config.in.powerpc +++ b/arch/Config.in.powerpc @@ -160,7 +160,7 @@ config BR2_ENDIAN config BR2_ARCH_HAS_ATOMICS default y -config BR2_GCC_TARGET_TUNE +config BR2_GCC_TARGET_CPU default "401" if BR2_powerpc_401 default "403" if BR2_powerpc_403 default "405" if BR2_powerpc_405
According to the gcc documentation for PowerPC options: '-mtune=CPU_TYPE' Set the instruction scheduling parameters for machine type CPU_TYPE, but do not set the architecture type, register usage, or choice of mnemonics, as '-mcpu=CPU_TYPE' would. The same values for CPU_TYPE are used for '-mtune' as for '-mcpu'. If both are specified, the code generated will use the architecture, registers, and mnemonics set by '-mcpu', but the scheduling parameters set by '-mtune'. In the case of Buildroot where we only target a specific system, using -mtune therefore doesn't make much sense, and using -mcpu would be more appropriate. As a consequence, this patch makes PowerPC use BR2_GCC_TARGET_CPU instead of BR2_GCC_TARGET_TUNE. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> --- arch/Config.in.powerpc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)