csgcca: introduce ${CSGCCA_ANALYZER_BIN} to specify analyzer binary

... at run-time

Closes: #5

doc/csgcca.adoc

@@ -88,6 +88,10 @@ ENVIRONMENT VARIABLES
     are appended even if they already appear in the command line and they are
     always appended at the end of the command line.
 
+*CSGCCA_ANALYZER_BIN*::
+    If set to a non-empty string, csgcca will use the value as a path (relative
+    or absolute) to analyzer binary.
+
 
 BUGS
 ----

src/csclng.c

@@ -37,6 +37,8 @@ const char *wrapper_debug_envvar_name = "DEBUG_CSCLNG";
 
 const char *analyzer_name = "clang";
 
+const char *analyzer_bin_envvar_name = NULL;
+
 const bool analyzer_is_cxx_ready = true;
 
 const bool analyzer_is_gcc_compatible = true;

src/cscppc.c

@@ -38,6 +38,8 @@ const char *wrapper_debug_envvar_name = "DEBUG_CSCPPC";
 
 const char *analyzer_name = "cppcheck";
 
+const char *analyzer_bin_envvar_name = NULL;
+
 const bool analyzer_is_cxx_ready = true;
 
 const bool analyzer_is_gcc_compatible = false;

src/csgcca.c

@@ -37,6 +37,8 @@ const char *wrapper_debug_envvar_name = "DEBUG_CSGCCA";
 
 const char *analyzer_name = "gcc";
 
+const char *analyzer_bin_envvar_name = "CSGCCA_ANALYZER_BIN";
+
 const bool analyzer_is_cxx_ready = false;
 
 const bool analyzer_is_gcc_compatible = true;

src/csmatch.c

@@ -37,6 +37,8 @@ const char *wrapper_debug_envvar_name = "DEBUG_CSMATCH";
 
 const char *analyzer_name = "smatch";
 
+const char *analyzer_bin_envvar_name = NULL;
+
 const bool analyzer_is_cxx_ready = false;
 
 const bool analyzer_is_gcc_compatible = true;

src/cswrap-core.c

@@ -393,8 +393,14 @@ static void consider_running_analyzer(
         return;
     }
 
-    /* make sure that the analyzer process is named analyzer_name */
-    argv[0] = (char *) analyzer_name;
+    const char *analyzer_name_actual = NULL;
+    if (analyzer_bin_envvar_name)
+        analyzer_name_actual = getenv(analyzer_bin_envvar_name);
+    if (!analyzer_name_actual || !analyzer_name_actual[0])
+        analyzer_name_actual = analyzer_name;
+
+    /* make sure that the analyzer process is named analyzer_name_actual */
+    argv[0] = (char *) analyzer_name_actual;
 
     /* make sure there is NULL at the end of argv[] */
     argv[argc_total - 1] = NULL;
@@ -410,7 +416,7 @@ static void consider_running_analyzer(
     }
 
     /* try to start analyzer */
-    pid_analyzer = launch_tool(analyzer_name, argv, /* del_args */ NULL);
+    pid_analyzer = launch_tool(analyzer_name_actual, argv, /* del_args */ NULL);
 
     /* FIXME: release also the memory allocated by asprintf() and
        read_custom_opts() */

src/cswrap-core.h

@@ -34,6 +34,13 @@ extern const char *wrapper_debug_envvar_name;
 
 extern const char *analyzer_name;
 
+/**
+ * The name of the environment variable which value is the path (relative or
+ * absolute) to the analyzer binary. If value of the environment variable is
+ * non-empty string, it's used to override the value of analyzer_name.
+ */
+extern const char *analyzer_bin_envvar_name;
+
 extern const bool analyzer_is_cxx_ready;
 
 extern const bool analyzer_is_gcc_compatible;