Hi Thomas It was just an implicit declaration of function, when set CONFIG_RTE_PCI_CONFIG=y, as follows. Nobody else cares about it.
/home/hzhan75/r22/isg_cid-dpdk_org/lib/librte_eal/common/eal_common_pci.c: In function ???rte_eal_pci_probe_one_driver???: /home/hzhan75/r22/isg_cid-dpdk_org/lib/librte_eal/common/eal_common_pci.c:188:4: error: implicit declaration of function ???pci_config_space_set??? [-Werror=implicit-function-declaration] pci_config_space_set(dev); ^ /home/hzhan75/r22/isg_cid-dpdk_org/lib/librte_eal/common/eal_common_pci.c:188:4: error: nested extern declaration of ???pci_config_space_set??? [-Werror=nested-externs] cc1: all warnings being treated as errors /home/hzhan75/r22/isg_cid-dpdk_org/lib/librte_eal/linuxapp/eal/eal_pci.c:561:1: error: ???pci_config_space_set??? defined but not used [-Werror=unused-function] pci_config_space_set(struct rte_pci_device *dev) ^ cc1: all warnings being treated as errors Regards, Helin > -----Original Message----- > From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com] > Sent: Wednesday, July 29, 2015 1:20 AM > To: Zhang, Helin > Cc: dev at dpdk.org > Subject: Re: [dpdk-dev] [PATCH] eal: fix build > > 2015-07-29 06:48, Helin Zhang: > > It fixes the build error of implicit declaration of function. > > What is the error? > Please show the build log and describe the case when it happens (compiler, > version).