[PATCH] Fix incorrect line numbers in large files bug#108900

[Jeremy Bettis]

Patch to fix known bug from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108900

diff -ur gcc-clean/gcc-14.2.0/libcpp/files.cc gcc-14.2.0/libcpp/files.cc
--- gcc-clean/gcc-14.2.0/libcpp/files.cc 2024-08-01 08:17:17.000000000 +0000
+++ gcc-14.2.0/libcpp/files.cc 2024-10-18 18:42:42.293245597 +0000
@@ -1005,6 +1005,11 @@
     && type < IT_DIRECTIVE_HWM
     && (pfile->line_table->highest_location
  != LINE_MAP_MAX_LOCATION - 1));
+  if (decrement && LINEMAPS_ORDINARY_USED (pfile->line_table)) {
+    const line_map_ordinary *map = LINEMAPS_LAST_ORDINARY_MAP
(pfile->line_table);
+    if (map && map->start_location == pfile->line_table->highest_location)
+      decrement = false;
+  }
   if (decrement)
     pfile->line_table->highest_location--;

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