Example code in docs produces warning/error

[MarkOates]

The following example code for al_draw_prim() will error (with the compile flag -Werror=reorder-ctor):

ALLEGRO_VERTEX v[] = {
   {.x = 128, .y = 0, .z = 0, .color = white, .u = 128, .v = 0},
   {.x = 0, .y = 256, .z = 0, .color = white, .u = 0, .v = 256},
   {.x = 256, .y = 256, .z = 0, .color = white, .u = 256, .v = 256}};

Error message is error: designator order for field does not match declaration order, indicating the order of fields declared here: ALLEGRO_VERTEX, does not match the order of the designators in the example.

In this case the side effect is not consequential, but could be fixed by moving .color = ... to the end of the list.

For some reason I only get this error on gcc (Win) and not clang (Mac).

[pedro-w]

What version of compiler? I was messing about with godbolt and I found it was never flagged if I compiled as C, but always a warning with clang in C++ mode and always an error with gcc in C++ mode.

[MarkOates]

Looks like this version is gcc version 9.2.0 (Rev2, Built by MSYS2 project). Target is x86_64-w64-mingw32, not sure if that makes a difference.

[ReiquelApplegate]

ALLEGRO_COLOR is all floats, so rearranging the members shouldn't change sizeof(ALLEGRO_VERTEX) either