The option argument is parsed into major, minor and patchlevel versions,
which are defined as __GNUC__, __GNUC_MINOR__, and __GNUC_PATCHLEVEL__ in
the preprocessor.
One possible use is running sparse compiled with the lastest gcc compiler
on a Linux kernel that doesn't support that compiler.
Signed-off-by: Pavel Roskin <pavel.roskin@xxxxxxxxxxxxxxx>
---
lib.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
sparse.1 | 7 +++++++
2 files changed, 52 insertions(+)
diff --git a/lib.c b/lib.c
index ce66a81..aff6862 100644
--- a/lib.c
+++ b/lib.c
@@ -24,6 +24,7 @@
*/
#include <ctype.h>
#include <fcntl.h>
+#include <limits.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
@@ -831,10 +832,54 @@ static char **handle_base_dir(char *arg, char **next)
return next;
}
+static char **handle_gcc_version(char *arg, char **next)
+{
+ unsigned long gcc_major_ul, gcc_minor_ul = 0, gcc_patchlevel_ul = 0;
+ char *gcc_version, *p;
+
+ gcc_version = *++next;
+ if (!gcc_version)
+ die("missing argument for -gcc-version option");
+
+ gcc_major_ul = strtoul(gcc_version, &p, 10);
+ if (gcc_major_ul > INT_MAX)
+ die("bad gcc major version");
+
+ if (*p == '\0')
+ goto good;
+ else if (*p != '.')
+ die("bad character after gcc major version");
+
+ gcc_minor_ul = strtoul(p + 1, &p, 10);
+ if (gcc_minor_ul > INT_MAX)
+ die("bad gcc minor version");
+
+ if (*p == '\0')
+ goto good;
+ else if (*p != '.')
+ die("bad character after gcc minor version");
+
+ gcc_patchlevel_ul = strtoul(p + 1, &p, 10);
+ if (gcc_patchlevel_ul > INT_MAX)
+ die("bad gcc patchlevel version");
+
+ if (*p != '\0')
+ die("bad character after gcc patchlevel version");
+
+good:
+ gcc_major = gcc_major_ul;
+ gcc_minor = gcc_minor_ul;
+ gcc_patchlevel = gcc_patchlevel_ul;
+
+ return next;
+}
+
static char **handle_switch_g(char *arg, char **next)
{
if (!strcmp (arg, "gcc-base-dir"))
return handle_base_dir(arg, next);
+ else if (!strcmp (arg, "gcc-version"))
+ return handle_gcc_version(arg, next);
return next;
}
diff --git a/sparse.1 b/sparse.1
index b79c587..9f2c52d 100644
--- a/sparse.1
+++ b/sparse.1
@@ -355,6 +355,13 @@ Look for system headers in the multiarch
subdirectory \fIdir\fR.
The \fIdir\fR name would normally take the form of the target's
normalized GNU triplet. (e.g. i386-linux-gnu).
.
+.TP
+.B \-gcc-version \fIversion\fR
+Simulate behavior of gcc of the specified version. At this time, this
+switch only affects macros \fI__GNUC__\fR, \fI__GNUC_MINOR__\fR, and
+\fI__GNUC_PATCHLEVEL__\fR. The default value is the version of gcc that
+compiled sparse, or \fI2.95.0\fR if that information is missing.
+.
.SH DEBUG OPTIONS
.TP
.B \-fdump-linearize[=only]
--
2.13.3
--
Regards,
Pavel Roskin
--
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