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Fix: GCC warns about possibly uninitialized data in signal.cpp

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When compiling with '-Og', GCC warns about variables that are
initialized by reference in the condition of a 'while' loop.

This commit silences the warning by explicitly initializing the
variables in question to their respective 'invalid value' markers,
which will most likely be optimized out when the compiler realizes
the values are never used.
This commit is contained in:
TechGeekNZ 2020-07-24 08:51:27 +12:00 committed by Charles Pigott
parent a56bf35409
commit c0bf7cc840
1 changed files with 7 additions and 7 deletions
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14
src/signal.cpp
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@ -268,10 +268,10 @@ static SigFlags ExploreSegment(Owner owner)
{
SigFlags flags = SF_NONE;
TileIndex tile;
DiagDirection enterdir;
TileIndex tile = INVALID_TILE; // Stop GCC from complaining about a possibly uninitialized variable (issue #8280).
DiagDirection enterdir = INVALID_DIAGDIR;
while (_tbdset.Get(&tile, &enterdir)) {
while (_tbdset.Get(&tile, &enterdir)) { // tile and enterdir are initialized here, unless I'm mistaken.
TileIndex oldtile = tile; // tile we are leaving
DiagDirection exitdir = enterdir == INVALID_DIAGDIR ? INVALID_DIAGDIR : ReverseDiagDir(enterdir); // expected new exit direction (for straight line)
@ -407,8 +407,8 @@ static SigFlags ExploreSegment(Owner owner)
*/
static void UpdateSignalsAroundSegment(SigFlags flags)
{
TileIndex tile;
Trackdir trackdir;
TileIndex tile = INVALID_TILE; // Stop GCC from complaining about a possibly uninitialized variable (issue #8280).
Trackdir trackdir = INVALID_TRACKDIR;
while (_tbuset.Get(&tile, &trackdir)) {
assert(HasSignalOnTrackdir(tile, trackdir));
@ -474,8 +474,8 @@ static SigSegState UpdateSignalsInBuffer(Owner owner)
bool first = true; // first block?
SigSegState state = SIGSEG_FREE; // value to return
TileIndex tile;
DiagDirection dir;
TileIndex tile = INVALID_TILE; // Stop GCC from complaining about a possibly uninitialized variable (issue #8280).
DiagDirection dir = INVALID_DIAGDIR;
while (_globset.Get(&tile, &dir)) {
assert(_tbuset.IsEmpty());