https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81826
Bug ID: 81826
Summary: Incorrect handling of directives left by preprocessor
Product: gcc
Version: 7.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: raullaasner at gmail dot com
Target Milestone: ---
I am trying to compile a preprocessed Fortran source file that contains a
syntax error:
$ cat main.f90
implicit none
a = 5
end program
$ gfortran -cpp -E main.f90 -o main.f90.pp.f90
$ gfortran main.f90.pp.f90
main.f90.pp.f90:2:3:
# 1 "<built-in>"
1
Error: Symbol ‘a’ at (1) has no IMPLICIT type
The problem is that the error message refers to the preprocessed file and not
the original source file. Also, it is showing an incorrect line above the
number "1", which should be the offending line. This is unlike the C compiler:
$ cat main.c
int main() // {
return 0;
}
$ gcc -E main.c -o main.c.pp.c
$ gcc main.c.pp.c
main.c: In function ‘main’:
main.c:2:3: error: expected declaration specifiers before ‘return’
return 0;
^~~~~~
main.c:3:1: error: expected declaration specifiers before ‘}’ token
}
^
main.c:3:1: error: expected ‘{’ at end of input
where the error message refers to the correct source file (main.c:2:3).
This issue was brought up at
https://gitlab.kitware.com/cmake/cmake/issues/17160#note_301744 and it inhibits
the correct behavior of CMake with the Ninja generator.
