| 2016-12-09 16:55:17 |
Bob Miller |
description |
The combination of union with anonymous struct member and initializer with statement function containing a declaration causes a spurious "missing initializer for field" warning.
I am using arm-none-eabi-gcc 5.4.1 20160919. I am using the project-compiled binaries. The bug is also present in 4.9.3 20141119 and 5.2.1 20151202.
Host machine is MacOS 10.11.6.
Transcript:
~$ cat > init-bug.c
union gfx_point {
struct {
float x, y;
};
};
union gfx_point line_p0;
void animate(void)
{
line_p0 = (union gfx_point) {
#ifdef NO_ERROR
.x = ({ 0; }),
#else
.x = ({
float z = 0;
z;
}),
#endif
.y = 0,
};
}
~$ arm-none-eabi-gcc --version
arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 5.4.1 20160919 (release) [ARM/embedded-5-branch revision 240496]
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
~$ arm-none-eabi-gcc -Wextra -c -std=c11 init-bug.c
init-bug.c: In function 'animate':
init-bug.c:20:9: warning: missing initializer for field 'y' of 'struct <anonymous>' [-Wmissing-field-initializers]
.y = 0,
^
init-bug.c:3:18: note: 'y' declared here
float x, y;
^
~$ arm-none-eabi-gcc -Wextra -c -std=c11 init-bug.c -DNO_ERROR
~$ |
The combination of union with anonymous struct member and initializer with statement expression containing a declaration causes a spurious "missing initializer for field" warning.
I am using arm-none-eabi-gcc 5.4.1 20160919. I am using the project-compiled binaries. The bug is also present in 4.9.3 20141119 and 5.2.1 20151202.
Host machine is MacOS 10.11.6.
Transcript:
~$ cat > init-bug.c
union gfx_point {
struct {
float x, y;
};
};
union gfx_point line_p0;
void animate(void)
{
line_p0 = (union gfx_point) {
#ifdef NO_ERROR
.x = ({ 0; }),
#else
.x = ({
float z = 0;
z;
}),
#endif
.y = 0,
};
}
~$ arm-none-eabi-gcc --version
arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 5.4.1 20160919 (release) [ARM/embedded-5-branch revision 240496]
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
~$ arm-none-eabi-gcc -Wextra -c -std=c11 init-bug.c
init-bug.c: In function 'animate':
init-bug.c:20:9: warning: missing initializer for field 'y' of 'struct <anonymous>' [-Wmissing-field-initializers]
.y = 0,
^
init-bug.c:3:18: note: 'y' declared here
float x, y;
^
~$ arm-none-eabi-gcc -Wextra -c -std=c11 init-bug.c -DNO_ERROR
~$ |
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