[PATCH v2 20/21] libcc1: avoid extra string copies

[Tom Tromey]

PR c/94669 points out that a couple of spots in libcc1 take a
std::string where a reference would do.  This changes these spots to
take a const char *, to reduce the number of copies.

libcc1/ChangeLog
2021-04-27  Tom Tromey  <t...@tromey.com>

        PR c/94669:
        * compiler.hh (compiler_driver_filename): Take const char *.
        (compiler_triplet_regexp): Likewise.
---
 libcc1/ChangeLog   | 6 ++++++
 libcc1/compiler.hh | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/libcc1/compiler.hh b/libcc1/compiler.hh
index 638f7c09f634..d10d409f9d35 100644
--- a/libcc1/compiler.hh
+++ b/libcc1/compiler.hh
@@ -58,7 +58,7 @@ namespace cc1_plugin
 
     char *find (const char *base, std::string &compiler) const override;
 
-    compiler_triplet_regexp (bool v, std::string triplet_regexp)
+    compiler_triplet_regexp (bool v, const char *triplet_regexp)
       : compiler (v), triplet_regexp_ (triplet_regexp)
     {
     }
@@ -72,7 +72,7 @@ namespace cc1_plugin
   public:
     char *find (const char *base, std::string &compiler) const override;
 
-    compiler_driver_filename (bool v, std::string driver_filename)
+    compiler_driver_filename (bool v, const char *driver_filename)
       : compiler (v), driver_filename_ (driver_filename)
     {
     }
-- 
2.26.2