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Merge commit 21e5e1724b75 from llvm git:

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getMainExecutable: Fix hand-rolled AT_EXECPATH for older FreeBSD

  Once we hit AT_NULL, we need to bail out of the loop; not just the
  enclosing switch.  This fixes basic usage (e.g. `cc --version`) when
  AT_EXECPATH isn't present on older branches (e.g. under
  emu-user-static, at the moment), where we would previously run off
  the end of ::environ.

  Patch By: kevans

  Reviewed By: arichardson

  Differential Revision:  https://reviews.llvm.org/D79239

MFC after:	3 days
This commit is contained in:
Ed Maste 2020-05-07 21:18:37 +00:00
parent b1ddcbc62c
commit c7d9dfe810
1 changed files with 2 additions and 7 deletions
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9
contrib/llvm-project/llvm/lib/Support/Unix/Path.inc
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@ -208,14 +208,9 @@ std::string getMainExecutable(const char *argv0, void *MainAddr) {
while (*p++ != 0)
;
// Iterate through auxiliary vectors for AT_EXECPATH.
for (;;) {
switch (*(uintptr_t *)p++) {
case AT_EXECPATH:
for (; *(uintptr_t *)p != AT_NULL; p++) {
if (*(uintptr_t *)p++ == AT_EXECPATH)
return *p;
case AT_NULL:
break;
}
p++;
}
#endif
// Fall back to argv[0] if auxiliary vectors are not available.