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From: | "Anne Hawson" <anne DOT hawson AT virgin DOT net> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | I can't compile with the -O2 switch. |
Date: | Tue, 24 Aug 1999 20:32:14 +0100 |
Organization: | Virgin Net Usenet Service |
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Message-ID: | <7purvn$j7h$1@nclient11-gui.server.virgin.net> |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
I wanted to compile C++ code into an executable with optimisations. In this case, it is a tiny program called "keypress.cpp" (pasted at the end of this message). It compiles fine with - > gxx -o keypress.exe keypress.cpp but complains with - > gxx -O2 keypress.exe keypress.cpp This produces - > keypress.exe(.text+0x200):crtfgo32.c: multiple definition of `__exit' > c:/djgpp/lib/crt0.o(.text+0x1ec):crt0.s: first defined here > keypress.exe(.text+0x2e4):crtfgo32.c: multiple definition of `__sbrk' > c:/djgpp/lib/crt0.o(.text+0x2d0):crt0.s: first defined here > keypress.exe(.text+0x4c8):crtfgo32.c: multiple definition of `_crt0_init_mcount' > > c:/djgpp/lib/crt0.o(.text+0x4b4):crt0.s: first defined here > keypress.exe(.text+0x2fc):crtfgo32.c: multiple definition of `__brk' > c:/djgpp/lib/crt0.o(.text+0x2e8):crt0.s: first defined here > keypress.exe(.text+0x14):crtfgo32.c: multiple definition of `start' > c:/djgpp/lib/crt0.o(.text+0x0):crt0.s: first defined here > c:/djgpp/tmp\cccq2u4j(.text+0xc):keypress.cpp: multiple definition of `main' > keypress.exe(.text+0x4d8):crtfgo32.c: first defined here I have no idea what this means. Can anyone see what is wrong and help me with this problem? If you need other information, then I will be happy to supply it. Thanks Dan. ---------------------------- #include <conio.h> #include <iostream.h> int main(void) { int c; c = getch(); while (c != 27) //27 = esc { cout<<"pressed :"<<c<<'\n'; c = getch(); } return 0; }
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