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2b2506c052
Before the build system used something like
echo "int main(){} void _exit(int n) {(void)n;while(1);}" | LC_ALL=C $(LINK) -xc - -o /dev/null -lc -Wall -Wextra -pedantic <FLAGS_TO_TEST>
to check for flags supported by the compiler (used as linker frontend).
This however no longer works with newlib 4.3.0, which requires the
symbols `_sbrk_r`, `_close_r`, `_lseek_r`, `_read_r`, and `_write_r` to
be present. Instead, now a new file `minimal_linkable.c` was added that
adds all the missing symbols and is used in the linker feature tests
instead.
56 lines
741 B
C
56 lines
741 B
C
#include <reent.h>
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int main(void)
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{
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return 0;
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}
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void _exit(int n)
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{
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(void)n;
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while(1);
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}
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void *_sbrk_r(struct _reent *r, ptrdiff_t incr)
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{
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(void)r;
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(void)incr;
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return NULL;
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}
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int _close_r(struct _reent *r, int fd)
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{
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(void)r;
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(void)fd;
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return 0;
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}
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_off_t _lseek_r(struct _reent *r, int fd, _off_t off, int whence)
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{
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(void)r;
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(void)fd;
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(void)off;
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(void)whence;
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return 0;
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}
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_ssize_t _read_r(struct _reent *r, int fd, void *buffer, size_t count)
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{
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(void)r;
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(void)fd;
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(void)buffer;
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(void)count;
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return 0;
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}
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_ssize_t _write_r(struct _reent *r, int fd, const void *data, size_t count)
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{
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(void)r;
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(void)fd;
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(void)data;
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(void)count;
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return 0;
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}
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