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Noncompliant Code Example

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Microsoft Visual Studio 2008 and later provide warnings for this code at the default warning level (/W3), however but earlier versions do not warn even at the highest diagnostic levels. The GCC compiler generates a fatal diagnostic for the conflicting definitions of i2 and i5.

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This compliant solution does not include conflicting definitions.:

int i1 = 10;  /* definition, external linkage */
static int i2 = 20;  /* definition, internal linkage */
extern int i3 = 30;  /* definition, external linkage */
int i4;  /* tentative definition, external linkage */
static int i5;  /* tentative definition, internal linkage */

int main(void) {
  /* ... */
}

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Bibliography

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