[
https://issues.apache.org/jira/browse/MYNEWT-688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jeff Chan updated MYNEWT-688:
-----------------------------
Description:
Using docker image (local toolchain gcc-5 install seems to avoid these warnings)
mynewt/newt latest 190ce9ee7de9 5 days
ago 1.05 GB
Compile fails for native sim target. Would love to help, but unsure what the
official way to ignore the return value is. GCC compile flag? Macro that uses
and discards the result?
Error: repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
'hal_uart_blocking_tx':
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:317:5: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
(void) write(uarts[port].u_fd, &data, sizeof(data));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function 'uart_pty':
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:267:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:276:5: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, strlen(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
'uart_set_attr':
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:240:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:251:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
'set_nonblock':
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:223:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:228:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
Error: repos/apache-mynewt-core/hw/mcu/native/src/hal_system.c: In function
'usage':
repos/apache-mynewt-core/hw/mcu/native/src/hal_system.c:58:5: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
(void) write(2, msg, strlen(msg));
^
cc1: all warnings being treated as errors
was:
Using docker image
mynewt/newt latest 190ce9ee7de9 5 days
ago 1.05 GB
Compile fails for native sim target. Would love to help, but unsure what the
official way to ignore the return value is. GCC compile flag? Macro that uses
and discards the result?
Error: repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
'hal_uart_blocking_tx':
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:317:5: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
(void) write(uarts[port].u_fd, &data, sizeof(data));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function 'uart_pty':
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:267:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:276:5: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, strlen(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
'uart_set_attr':
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:240:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:251:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
'set_nonblock':
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:223:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:228:9: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
write(1, msg, sizeof(msg));
^
Error: repos/apache-mynewt-core/hw/mcu/native/src/hal_system.c: In function
'usage':
repos/apache-mynewt-core/hw/mcu/native/src/hal_system.c:58:5: error: ignoring
return value of 'write', declared with attribute warn_unused_result
[-Werror=unused-result]
(void) write(2, msg, strlen(msg));
^
cc1: all warnings being treated as errors
> error: ignoring return value of 'write', declared with attribute
> warn_unused_result
> -----------------------------------------------------------------------------------
>
> Key: MYNEWT-688
> URL: https://issues.apache.org/jira/browse/MYNEWT-688
> Project: Mynewt
> Issue Type: Bug
> Components: HAL
> Affects Versions: v1_0_0_beta1
> Environment: OS X w/ newt docker container
> Reporter: Jeff Chan
> Assignee: Marko Kiiskila
> Priority: Minor
> Fix For: v1_0_0_rel
>
>
> Using docker image (local toolchain gcc-5 install seems to avoid these
> warnings)
> mynewt/newt latest 190ce9ee7de9 5
> days ago 1.05 GB
> Compile fails for native sim target. Would love to help, but unsure what the
> official way to ignore the return value is. GCC compile flag? Macro that
> uses and discards the result?
> Error: repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
> 'hal_uart_blocking_tx':
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:317:5: error: ignoring
> return value of 'write', declared with attribute warn_unused_result
> [-Werror=unused-result]
> (void) write(uarts[port].u_fd, &data, sizeof(data));
> ^
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function 'uart_pty':
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:267:9: error: ignoring
> return value of 'write', declared with attribute warn_unused_result
> [-Werror=unused-result]
> write(1, msg, sizeof(msg));
> ^
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:276:5: error: ignoring
> return value of 'write', declared with attribute warn_unused_result
> [-Werror=unused-result]
> write(1, msg, strlen(msg));
> ^
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
> 'uart_set_attr':
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:240:9: error: ignoring
> return value of 'write', declared with attribute warn_unused_result
> [-Werror=unused-result]
> write(1, msg, sizeof(msg));
> ^
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:251:9: error: ignoring
> return value of 'write', declared with attribute warn_unused_result
> [-Werror=unused-result]
> write(1, msg, sizeof(msg));
> ^
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c: In function
> 'set_nonblock':
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:223:9: error: ignoring
> return value of 'write', declared with attribute warn_unused_result
> [-Werror=unused-result]
> write(1, msg, sizeof(msg));
> ^
> repos/apache-mynewt-core/hw/mcu/native/src/hal_uart.c:228:9: error: ignoring
> return value of 'write', declared with attribute warn_unused_result
> [-Werror=unused-result]
> write(1, msg, sizeof(msg));
> ^
> Error: repos/apache-mynewt-core/hw/mcu/native/src/hal_system.c: In function
> 'usage':
> repos/apache-mynewt-core/hw/mcu/native/src/hal_system.c:58:5: error: ignoring
> return value of 'write', declared with attribute warn_unused_result
> [-Werror=unused-result]
> (void) write(2, msg, strlen(msg));
> ^
> cc1: all warnings being treated as errors
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