I am currently converting a computer game project from Microsoft Visual
Studio to GCC. Under Microsoft Visual Studio it builds and runs correctly.
Under GCC it compiles but does not link.
The source file "Battlefield.cpp" contains the line:
extern bool bRemoveOrganFromBeast, bCarryingNarulung, g_bManWillBeAttacked;
The source file "Enemy.cpp" contains the lines:
bool g_bManWillBeAttacked = false, g_bMakingGift = false, g_bGiftAccepted[2]
= { false, false }, g_bEnemyMoveCallback = false;
#pragma message("The symbol \"g_bManWillBeAttacked\" has been defined.")
The compiler output contains the line:
../../Human/Enemy.cpp:23:72: note: #pragma message: The symbol
"g_bManWillBeAttacked" has been defined.
The linker output contains the line:
Battlefield.o:Battlefield.cpp:(.text+0xcd): undefined reference to
`g_bManWillBeAttacked'
and ends with the lines:
/usr/lib/gcc/i686-pc-cygwin/4.8.2/../../../../i686-pc-cygwin/bin/ld:
Battlefield.o: bad reloc address 0xd in section
`.text$_ZN7CListOfI8ISoldierEC1Ev[__ZN7CListOfI8ISoldierEC1Ev]'
/usr/lib/gcc/i686-pc-cygwin/4.8.2/../../../../i686-pc-cygwin/bin/ld: final
link failed: Invalid operation
collect2: error: ld returned 1 exit status
Questions: (1) Does "undefined reference" here mean the same as "unresolved
external symbol" does under Microsoft Visual Studio?
(2) How can that happen when the symbol is obviously defined?
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