Error building C program
- by John
Here are my 2 source files:
main.c:
#include <stdio.h>
#include "part2.c"
extern int var1;
extern int array1[];
int main()
{
var1 = 4;
array1[0] = 2;
array1[1] = 4;
array1[2] = 5;
array1[3] = 7;
display();
printf("---------------");
printf("Var1: %d", var1);
printf("array elements:");
int x;
for(x = 0;x < 4;++x)
printf("%d: %d", x, array1[x]);
return 0;
}
part2.c
#include <stdio.h>
int var1;
int array1[4];
void display(void);
void display(void)
{
printf("Var1: %d", var1);
printf("array elements:");
int x;
for(x = 0;x < 4;++x)
printf("%d: %d", x, array1[x]);
}
When i try to compile the program this is what i get:
Ld /Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Products/Debug/Test normal x86_64
cd /Users/John/Xcode/Test
setenv MACOSX_DEPLOYMENT_TARGET 10.7
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk -L/Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Products/Debug -F/Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Products/Debug -filelist /Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Intermediates/Test.build/Debug/Test.build/Objects-normal/x86_64/Test.LinkFileList -mmacosx-version-min=10.7 -o /Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Products/Debug/Test
ld: duplicate symbol _display in /Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Intermediates/Test.build/Debug/Test.build/Objects-normal/x86_64/part2.o and /Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Intermediates/Test.build/Debug/Test.build/Objects-normal/x86_64/main.o for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I am using Xcode and both files are inside of a C project called Test
What is causing the error and how do i fix it?
