https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81745
Bug ID: 81745
Summary: missing warning with -pedantic when a C file does not
end with a newline character
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: vincent-gcc at vinc17 dot net
Target Milestone: ---
The ISO C99 and C11 standards say in 5.1.1.2#2: "A source file that is not
empty shall end in a new-line character". But the following doesn't generate
any warning or error message:
$ printf 'int main(void) { return 0; }' | gcc -xc -std=c99 -pedantic -
$
with all the GCC versions I could test, including a 8.0.0 snapshot [trunk
revision 250749].
Clang generates a warning (implied by -pedantic) as expected:
$ printf 'int main(void) { return 0; }' | clang-4.0 -xc -std=c99 -pedantic -
<stdin>:1:29: warning: no newline at end of file [-Wnewline-eof]
int main(void) { return 0; }
^
1 warning generated.
$
GCC should do the same thing and use the same warning name -Wnewline-eof.
Note: This bug is apparently a consequence of the fix of PR14331. In the bug
report, it was asked for a new option, but the warning was suppressed
unconditionally:
https://gcc.gnu.org/viewcvs/gcc/trunk/libcpp/lex.c?r1=125212&r2=125211&pathrev=125212
