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cmake: For gcc8 use linker to find paths to libc, libm, libstdc++, etc

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Removes the need to know/guess the paths to these libraries. Once we are gcc 8 only, we
can remove -nostdlib and no additional arguments are needed for system libraries.

The catch is: any time IDF overrides a symbol in the toolchain sysroot, we need
an undefined linker marker to make sure this symbol is seen by linker.
This commit is contained in:
Angus Gratton
2019-04-15 13:45:08 +10:00
committed by Renz Christian Bagaporo
parent 2c12080049
commit 22514c1dd9
13 changed files with 83 additions and 41 deletions
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33
components/vfs/vfs.c
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@@ -544,6 +544,34 @@ int esp_vfs_rename(struct _reent *r, const char *src, const char *dst)
return ret;
}
/* Create aliases for newlib syscalls
These functions are also available in ROM as stubs which use the syscall table, but linking them
directly here saves an additional function call when a software function is linked to one, and
makes linking with -stdlib easier.
*/
int _open_r(struct _reent *r, const char * path, int flags, int mode)
__attribute__((alias("esp_vfs_open")));
ssize_t _write_r(struct _reent *r, int fd, const void * data, size_t size)
__attribute__((alias("esp_vfs_write")));
off_t _lseek_r(struct _reent *r, int fd, off_t size, int mode)
__attribute__((alias("esp_vfs_lseek")));
ssize_t _read_r(struct _reent *r, int fd, void * dst, size_t size)
__attribute__((alias("esp_vfs_read")));
int _close_r(struct _reent *r, int fd)
__attribute__((alias("esp_vfs_close")));
int _fstat_r(struct _reent *r, int fd, struct stat * st)
__attribute__((alias("esp_vfs_fstat")));
int _stat_r(struct _reent *r, const char * path, struct stat * st)
__attribute__((alias("esp_vfs_stat")));
int _link_r(struct _reent *r, const char* n1, const char* n2)
__attribute__((alias("esp_vfs_link")));
int _unlink_r(struct _reent *r, const char *path)
__attribute__((alias("esp_vfs_unlink")));
int _rename_r(struct _reent *r, const char *src, const char *dst)
__attribute__((alias("esp_vfs_rename")));
DIR* opendir(const char* name)
{
const vfs_entry_t* vfs = get_vfs_for_path(name);
@@ -1193,3 +1221,8 @@ int esp_vfs_poll(struct pollfd *fds, nfds_t nfds, int timeout)
return ret;
}
void vfs_include_syscalls_impl()
{
// Linker hook function, exists to make the linker examine this fine
}