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Removing strict aliasing error

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Adding comment for fixing this error better
This commit is contained in:
Jay McCarthy 2010-05-19 11:08:22 -05:00
parent 15a1dd6b20
commit 15a4946d32
1 changed files with 16 additions and 8 deletions
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24
src/wxxt/src/Windows/Canvas.cc
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@ -307,6 +307,14 @@ void wxCanvas::ScrollPercent(double x, double y)
}
}
// This could be removed by changing the uses of float_a below to use memcpy
#ifdef __GNUC__
# define MAY_ALIAS __attribute__((__may_alias__))
#else
# define MAY_ALIAS
#endif
typedef float MAY_ALIAS float_a;
void wxCanvas::SetScrollbars(int h_pixels, int v_pixels, int x_len, int y_len,
int x_page, int y_page, int x_pos, int y_pos,
Bool setVirtualSize)
@ -320,7 +328,7 @@ void wxCanvas::SetScrollbars(int h_pixels, int v_pixels, int x_len, int y_len,
if (y_len < 0) v_pixels = -1;
if (setVirtualSize) {
Arg a[4];
MAY_ALIAS Arg a[4];
XtVaSetValues(X->scroll, XtNautoAdjustScrollbars, 1, NULL);
@ -351,11 +359,11 @@ void wxCanvas::SetScrollbars(int h_pixels, int v_pixels, int x_len, int y_len,
a[0].name = XtNabs_height;
a[0].value = v_pixels > 0 ? ((Dimension)v_size) : 0;
a[1].name = XtNrel_height;
*(float *)(void *)&(a[1].value) = (float)(v_pixels > 0 ? 0.0 : 1.0);
*(float_a *)(void *)&(a[1].value) = (float_a)(v_pixels > 0 ? 0.0 : 1.0);
a[2].name = XtNabs_width;
a[2].value = h_pixels > 0 ? ((Dimension)h_size) : 0;
a[3].name = XtNrel_width;
*(float *)(void *)&(a[3].value) = (float)(h_pixels > 0 ? 0.0 : 1.0);
*(float_a *)(void *)&(a[3].value) = (float_a)(h_pixels > 0 ? 0.0 : 1.0);
XtSetValues(X->handle, a, 4);
@ -368,26 +376,26 @@ void wxCanvas::SetScrollbars(int h_pixels, int v_pixels, int x_len, int y_len,
NULL);
}
} else {
Arg a[8];
MAY_ALIAS Arg a[8];
XtVaSetValues(X->scroll, XtNautoAdjustScrollbars, 0, NULL);
a[0].name = XtNabs_height;
a[0].value = 0;
a[1].name = XtNrel_height;
*(float *)(void *)&(a[1].value) = 1.0;
*(float_a *)(void *)&(a[1].value) = 1.0;
a[2].name = XtNabs_width;
a[2].value = 0;
a[3].name = XtNrel_width;
*(float *)(void *)&(a[3].value) = 1.0;
*(float_a *)(void *)&(a[3].value) = 1.0;
a[4].name = XtNabs_x;
a[4].value = 0;
a[5].name = XtNabs_y;
a[5].value = 0;
a[6].name = XtNrel_x;
*(float *)(void *)&(a[6].value) = 0.0;
*(float_a *)(void *)&(a[6].value) = 0.0;
a[7].name = XtNrel_y;
*(float *)(void *)&(a[7].value) = 0.0;
*(float_a *)(void *)&(a[7].value) = 0.0;
XtSetValues(X->handle, a, 8);