CI fixes (#4)

* Update CI

* Remove my_strerror

* Fix path

* Add my_strerror back

* Touch gcc/cp/parse.c

.github/workflows/build.yml

@@ -1,6 +1,6 @@
 name: Build
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
@@ -24,7 +24,7 @@ jobs:
 
     name: Building gcc for ${{ matrix.TARGET.OS }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install dependencies (Ubuntu)
         shell: bash
@@ -39,8 +39,11 @@ jobs:
 
       - name: Make
         shell: bash
-        run: |
+        run: | # The generated `c-parse.c` is already commited on the repo, so we touch it to avoid regenerating it (trying to build old lex/yacc files with modern tools fails)
+          touch gcc/c-parse.c
+          touch gcc/cp/parse.c
           make -C gcc CFLAGS="${{ matrix.TARGET.CFLAGS }}" xgcc cc1 cc1plus cpp cccp g++
+
       - name: Test for file
         shell: bash
         run: |

gcc/gcc.c

@@ -1092,22 +1092,7 @@ char *
 my_strerror(e)
      int e;
 {
-#ifdef HAVE_STRERROR
-
   return strerror(e);
-
-#else
-
-  static char buffer[30];
-  if (!e)
-    return "cannot access";
-
-  if (e > 0 && e < sys_nerr)
-    return sys_errlist[e];
-
-  sprintf (buffer, "Unknown error %d", e);
-  return buffer;
-#endif
 }
 
 static char *