[PATCH] fix -fdebug-prefix-map without gas .file support

[Richard Biener <rguenther@suse.de>]

This applies file mapping when emitting the directory table
directly instead of using the assemblers .file directive where
we already correctly apply the map.  Notably the non-assembler
path is used for the early debug emission for LTO.

Bootstrapped and tested on x86_64-unknown-linux-gnu.

OK for trunk?

Thanks,
Richard.

2020-02-21  Mark Williams  <mwilliams@fb.com>

	* dwarf2out.c (file_name_acquire): Call remap_debug_filename.
---
 gcc/dwarf2out.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 577be3d52d3..ba9da0f2cc2 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -12205,8 +12205,9 @@ file_name_acquire (dwarf_file_data **slot, file_name_acquire_data *fnad)
 
   fi = fnad->files + fnad->used_files++;
 
+  f = remap_debug_filename (d->filename);
+
   /* Skip all leading "./".  */
-  f = d->filename;
   while (f[0] == '.' && IS_DIR_SEPARATOR (f[1]))
     f += 2;
 
-- 
2.16.4