Compilation error orcompile error refers to a state when acompiler fails to compile a piece ofcomputer programsource code, either due to errors in the code, or, more unusually, due to errors in the compiler itself. A compilation error message often helpsprogrammersdebugging the source code. Although the definitions of compilation andinterpretation can be vague, generally compilation errors only refer to static compilation and notdynamic compilation. However, dynamic compilation can still technically have compilation errors,[citation needed] although many programmers and sources may identify them asrun-time errors. Mostjust-in-time compilers, such as theJavascript V8 engine, ambiguously refer to compilation errors assyntax errors since they check for them atrun time.[1][2]
doy.cpp: In function `int main()':doy.cpp:25: `DayOfYear' undeclared (first use this function)[3]
This means that the variable "DayOfYear" is trying to be used before being declared.
xyz.cpp: In function `int main()': xyz.cpp:6: `cout' undeclared (first use this function)[3]
This means that the programmer most likely forgot to includeiostream.
somefile.cpp:24: parse error before `something'[4]
This could mean that a semi-colon is missing at the end of the previous statement.
An internal compiler error (commonly abbreviated as ICE) is an error that occurs not due to erroneous source code, but rather due to a bug in the compiler itself. They can sometimes be worked around by making small, insignificant changes to the source code around the line indicated by the error (if such a line is indicated at all),[5][better source needed] but sometimes larger changes must be made, such asrefactoring the code, to avoid certain constructs. Using a different compiler or different version of the compiler may solve the issue and be an acceptable solution in some cases. When an internal compiler error is reached many compilers do not output a standard error, but instead output a shortened version, with additional files attached, which are only provided for internal compiler errors. This is in order to insure that the program doesn't crash when logging the error, which would make solving the error nigh impossible. The additional files attached for internal compiler errors usually have special formats that they save as, such as.dump forJava. These formats are generally more difficult to analyze than regular files, but can still have very helpful information for solving the bug causing the crash.[6]
Example of an internal compiler error:
somefile.c:1001: internal compiler error: Segmentation faultPlease submit a full bug report,with preprocessed source if appropriate.See <http://bugs.gentoo.org/> for instructions.