From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
To: Hemant Agrawal <hemant.agrawal@nxp.com>
Cc: Neil Horman <nhorman@tuxdriver.com>,
"dev@dpdk.org" <dev@dpdk.org>, "users@dpdk.org" <users@dpdk.org>,
"Jacob, Jerin" <Jerin.Jacob@cavium.com>,
Jan Viktorin <viktorin@rehivetech.com>
Subject: Re: [dpdk-users] pmdinfogen issues: cross compilation for ARM fails with older host compiler
Date: Mon, 14 Nov 2016 02:29:24 +0530 [thread overview]
Message-ID: <20161113205924.GA11392@localhost.localdomain> (raw)
In-Reply-To: <DB5PR04MB1605F64CF0D986E0B2B26AF089BB0@DB5PR04MB1605.eurprd04.prod.outlook.com>
On Fri, Nov 11, 2016 at 10:34:39AM +0000, Hemant Agrawal wrote:
> Hi Neil,
> Pmdinfogen compiles with host compiler. It usages rte_byteorder.h of the target platform.
> However, if the host compiler is older than 4.8, it will be an issue during cross compilation for some platforms.
> e.g. if we are compiling on x86 host for ARM, x86 host compiler will not understand the arm asm instructions.
>
> /* fix missing __builtin_bswap16 for gcc older then 4.8 */
> #if !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))
> static inline uint16_t rte_arch_bswap16(uint16_t _x)
> {
> register uint16_t x = _x;
> asm volatile ("rev16 %0,%1"
> : "=r" (x)
> : "r" (x)
> );
> return x;
> }
> #endif
>
> One easy solution is that we add compiler platform check in this code section of rte_byteorder.h
> e.g
> #if !(defined __arm__ || defined __aarch64__)
> static inline uint16_t rte_arch_bswap16(uint16_t _x)
> {
> return (_x >> 8) | ((_x << 8) & 0xff00);
> }
> #else ….
>
> Is there a better way to fix it?
IMO, It is a HOST build infrastructure issue. If a host app is using the
dpdk service then it should compile and link against HOST target(in this
specific case, build/x86_64-native-linuxapp-gcc). I think, introducing the
HOSTTARGET kind of scheme is a clean solution.
/Jerin
next prev parent reply other threads:[~2016-11-13 20:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-11 10:34 Hemant Agrawal
2016-11-11 13:48 ` Jan Viktorin
2016-11-11 19:25 ` Neil Horman
2016-11-13 20:59 ` Jerin Jacob [this message]
2016-11-14 14:48 ` Neil Horman
2016-11-15 9:34 ` Hemant Agrawal
2016-11-15 14:27 ` Neil Horman
2016-11-15 15:08 ` Neil Horman
2016-11-18 12:03 ` Hemant Agrawal
2016-11-18 13:50 ` Neil Horman
2016-11-18 16:37 ` [dpdk-users] [dpdk-dev] " Bruce Richardson
2016-11-18 18:39 ` Neil Horman
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