To optimize out calls to undefined functions in PBL at compile-time
instead of link time, let's define stubs for the functions that
are referenced in obj-pbl-y files, but inside function sections
that are ultimately unreferenced.
We don't use IS_PROPER here as VFS support is always available
in barebox proper.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
include/fcntl.h | 8 ++++++
include/libfile.h | 7 +++++
include/unistd.h | 72 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 87 insertions(+)
diff --git a/include/fcntl.h b/include/fcntl.h
index a746471411b5..f3694c2bba5f 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -3,6 +3,7 @@
#define __FCNTL_H
#include <linux/types.h>
+#include <errno.h>
#define AT_FDCWD -100 /* Special value used to indicate
openat should use the current
@@ -38,7 +39,14 @@
#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
+#if IN_PROPER
int openat(int dirfd, const char *pathname, int flags);
+#else
+static inline int openat(int dirfd, const char *pathname, int flags, ...)
+{
+ return -ENOSYS;
+}
+#endif
static inline int open(const char *pathname, int flags, ...)
{
diff --git a/include/libfile.h b/include/libfile.h
index f772ff8b6af2..bf775b022dc4 100644
--- a/include/libfile.h
+++ b/include/libfile.h
@@ -32,7 +32,14 @@ int copy_recursive(const char *src, const char *dst);
int compare_file(const char *f1, const char *f2);
+#if IN_PROPER
int open_and_lseek(const char *filename, int mode, loff_t pos);
+#else
+static inline int open_and_lseek(const char *filename, int mode, loff_t pos)
+{
+ return -ENOSYS;
+}
+#endif
/* Create a directory and its parents */
int make_directory(const char *pathname);
diff --git a/include/unistd.h b/include/unistd.h
index f3d2378687e4..aad67ad30f84 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -4,11 +4,13 @@
#include <linux/types.h>
#include <fcntl.h>
+#include <errno.h>
#define RW_BUF_SIZE (unsigned)4096
struct stat;
+#if IN_PROPER
int unlinkat(int dirfd, const char *pathname, int flags);
int close(int fd);
int lstatat(int dirfd, const char *filename, struct stat *s);
@@ -26,6 +28,76 @@ char *pushd(const char *dir);
int popd(char *dir);
const char *getcwd(void);
int ftruncate(int fd, loff_t length);
+#else
+static inline int unlinkat(int dirfd, const char *pathname, int flags)
+{
+ return -ENOSYS;
+}
+static inline int close(int fd)
+{
+ return -ENOSYS;
+}
+static inline int lstatat(int dirfd, const char *filename, struct stat *s)
+{
+ return -ENOSYS;
+}
+static inline int statat(int dirfd, const char *filename, struct stat *s)
+{
+ return -ENOSYS;
+}
+static inline int fstat(int fd, struct stat *s)
+{
+ return -ENOSYS;
+}
+static inline ssize_t read(int fd, void *buf, size_t count)
+{
+ return -ENOSYS;
+}
+static inline ssize_t pread(int fd, void *buf, size_t count, loff_t offset)
+{
+ return -ENOSYS;
+}
+static inline ssize_t write(int fd, const void *buf, size_t count)
+{
+ return -ENOSYS;
+}
+static inline ssize_t pwrite(int fd, const void *buf, size_t count, loff_t offset)
+{
+ return -ENOSYS;
+}
+static inline loff_t lseek(int fildes, loff_t offset, int whence)
+{
+ return -ENOSYS;
+}
+static inline int symlink(const char *pathname, const char *newpath)
+{
+ return -ENOSYS;
+}
+static inline int readlinkat(int dirfd, const char *path, char *buf, size_t bufsiz)
+{
+ return -ENOSYS;
+}
+static inline int chdir(const char *pathname)
+{
+ return -ENOSYS;
+}
+static inline char *pushd(const char *dir)
+{
+ return NULL;
+}
+static inline int popd(char *dir)
+{
+ return -ENOSYS;
+}
+static inline const char *getcwd(void)
+{
+ return NULL;
+}
+static inline int ftruncate(int fd, loff_t length)
+{
+ return -ENOSYS;
+}
+#endif
static inline int unlink(const char *pathname)
{
--
2.39.5
