[TW#26189] lwip stack broken in master commit

[chegewara]

In file included from D:/msys32/home/imper/ble_test/components/cpp_utils/WiFi.cpp:25:0:
D:/msys32/home/imper/esp/esp-idf/components/lwip/lwip/src/include/lwip/dns.h:112:1: error: 'err_t' does not name a type
 err_t            dns_gethostbyname(const char *hostname, ip_addr_t *addr,
 ^
D:/msys32/home/imper/esp/esp-idf/components/lwip/lwip/src/include/lwip/dns.h:114:1: error: 'err_t' does not name a type
 err_t            dns_gethostbyname_addrtype(const char *hostname, ip_addr_t *addr,
 ^

[negativekelvin]

These lines went missing

esp-idf/components/lwip/include/lwip/lwip/dns.h

Lines 39 to 41 in 35785d0

	#if ESP_DNS
	#include "lwip/err.h"
	#endif

[igrr]

FWIW this include seems to be needed even without ESP_DNS. Will add.

[negativekelvin]

Yep yarrick/lwip@5b459c1

[gregjesl]

sntp/sntp.h is not present in the new lwip submodule. Is this by design? The Azure IoT Hub Client (which we are using in our project) uses sntp.h.

In file included from C:/Users/[Removed]/Documents/GitHub/[Removed]/components/azure-iot-sdk-c/c-utility/pal/lwip/sntp_lwip.c:10:0:
C:/Users/[Removed]/Documents/GitHub/[Removed]/components/azure-iot-sdk-c/c-utility/pal/lwip/sntp_os.h:14:28: fatal error: apps/sntp/sntp.h: No such file or directory
compilation terminated.
make[1]: *** [/c/esp-idf/make/component_wrapper.mk:286: c-utility/pal/lwip/sntp_lwip.o] Error 1
make: *** [C:/esp-idf/make/project.mk:481: component-azure-iot-sdk-c-build] Error 2

[negativekelvin]

esp-idf/examples/protocols/sntp/main/sntp_example_main.c

Line 24 in 6f58208

#include "lwip/apps/sntp.h"

[gregjesl]

@negativekelvin Thank you. I've created a pull request for Azure (Azure/azure-c-shared-utility#184)

[igrr]

Will add an sntp/sntp.h compatibility header in IDF as well

[liuzfesp]

@zhangyanjiao please help

[zhangyanjiaoesp]

@liuzfesp igrr has solved this problem.