[PATCH] gcc: Make strchr return value pointers const

["Martin Storsjö" <martin@martin.st>]

This fixes compilation of codepaths for dos-like filesystems
with Clang. When built with clang, it treats C input files as C++
when the compiler driver is invoked in C++ mode, triggering errors
when the return value of strchr() on a pointer to const is assigned
to a pointer to non-const variable.

This matches similar variables outside of the ifdefs for dos-like
path handling.

2020-09-01  Martin Storsjö  <martin@martin.st>

gcc/Changelog:
        * dwarf2out.c (file_name_acquire): Make a strchr return value
        pointer to const.

libcpp/Changelog:
        * files.c (remap_filename): Make a strchr return value pointer
        to const.
---
 gcc/dwarf2out.c | 2 +-
 libcpp/files.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index b6ab49bb548..4096c0c0d69 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -12118,7 +12118,7 @@ file_name_acquire (dwarf_file_data **slot, file_name_acquire_data *fnad)
   f = strrchr (f, DIR_SEPARATOR);
 #if defined (DIR_SEPARATOR_2)
   {
-    char *g = strrchr (fi->path, DIR_SEPARATOR_2);
+    const char *g = strrchr (fi->path, DIR_SEPARATOR_2);
 
     if (g != NULL)
       {
diff --git a/libcpp/files.c b/libcpp/files.c
index 3d48c38fc0a..b890b8ebf1e 100644
--- a/libcpp/files.c
+++ b/libcpp/files.c
@@ -1693,7 +1693,7 @@ remap_filename (cpp_reader *pfile, _cpp_file *file)
       p = strchr (fname, '/');
 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
       {
-	char *p2 = strchr (fname, '\\');
+	const char *p2 = strchr (fname, '\\');
 	if (!p || (p > p2))
 	  p = p2;
       }
-- 
2.17.1