http://llvm.org/bugs/show_bug.cgi?id=6101
Summary: clang: preprocessor doesn't honor #line directives!
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: preprocessor
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Consider this testcase, clang -E only preserves the filenames, not the line
numbers!
int main()
{
#line 10 "foo1.c"
printf("test\n");
#line 200 "foo2.c"
printf("foo\n");
#line 10 "foo1.c"
}
clang -E gives:
# 1 "x.c"
# 1 "x.c" 1
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 113 "<built-in>" 3
# 113 "<command line>" 1
# 114 "<built-in>" 2
# 1 "x.c" 2
int main()
{
# 3 "foo1.c"
printf("test\n");
# 5 "foo2.c"
printf("foo\n");
# 7 "foo1.c"
}
gcc -E gives:
# 1 "x.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "x.c"
int main()
{
# 10 "foo1.c"
printf("test\n");
# 200 "foo2.c"
printf("foo\n");
# 10 "foo1.c"
}
The line numbers in #line must be honored to correctly compile output from
parser generators like bison, re2c, etc.
Otherwise warnings, and debug line numbers are all wrong.
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