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libcpp: Fix up -fdirectives-only preprocessing of includes not ending with newline [PR100392] 

If a header doesn't end with a new-line, with -fdirectives-only we right now
preprocess it as
int i = 1;# 2 "pr100392.c" 2
i.e. the line directive isn't on the next line, which means we fail to parse
it when compiling.

GCC 10 and earlier libcpp/directives-only.c had for this:
  if (!pfile->state.skipping && cur != base)
    {
      /* If the file was not newline terminated, add rlimit, which is
         guaranteed to point to a newline, to the end of our range.  */
      if (cur[-1] != '\n')
        {
          cur++;
          CPP_INCREMENT_LINE (pfile, 0);
          lines++;
        }

      cb->print_lines (lines, base, cur - base);
    }
and we have the assertion
      /* Files always end in a newline or carriage return.  We rely on this for
         character peeking safety.  */
      gcc_assert (buffer->rlimit[0] == '\n' || buffer->rlimit[0] == '\r');
So, this patch just does readd the more less same thing, so that we emit
a newline after the inline even when it wasn't there before.

2021-05-12  Jakub Jelinek  <jakub@redhat.com>

	PR preprocessor/100392
	* lex.c (cpp_directive_only_process): If buffer doesn't end with '\n',
	add buffer->rlimit[0] character to the printed range and
	CPP_INCREMENT_LINE and increment line_count.

	* gcc.dg/cpp/pr100392.c: New test.
	* gcc.dg/cpp/pr100392.h: New file.
This commit is contained in:
Jakub Jelinek 2021-05-12 15:14:35 +02:00
parent fc186594e3
commit c6b664e2c4
3 changed files with 21 additions and 1 deletions
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5
gcc/testsuite/gcc.dg/cpp/pr100392.c Normal file
View File

@ -0,0 +1,5 @@
/* PR preprocessor/100392 */
/* { dg-do compile } */
/* { dg-options "-save-temps -fdirectives-only" } */
#include "pr100392.h"

4
gcc/testsuite/gcc.dg/cpp/pr100392.h Normal file
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@ -0,0 +1,4 @@
/* PR preprocessor/100392 */
/* No newline after ; below. */
int i = 1;

13
libcpp/lex.c
View File

@ -4768,7 +4768,18 @@ cpp_directive_only_process (cpp_reader *pfile,
}
if (buffer->rlimit > base && !pfile->state.skipping)
cb (pfile, CPP_DO_print, data, line_count, base, buffer->rlimit - base);
{
const unsigned char *limit = buffer->rlimit;
/* If the file was not newline terminated, add rlimit, which is
guaranteed to point to a newline, to the end of our range. */
if (limit[-1] != '\n')
{
limit++;
CPP_INCREMENT_LINE (pfile, 0);
line_count++;
}
cb (pfile, CPP_DO_print, data, line_count, base, limit - base);
}
_cpp_pop_buffer (pfile);
}