https://bugs.llvm.org/show_bug.cgi?id=43666
Bug ID: 43666
Summary: -mlong-double-64/80/128 documentation incomplete
Product: Documentation
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: General docs
Assignee: unassignedb...@nondot.org
Reporter: tyde...@tybor.com
CC: llvm-bugs@lists.llvm.org
Assuming that clang is implementing the same as gcc, the documentation of
-mlong-double-64/80/128 in
https://clang.llvm.org/docs/ClangCommandLineReference.html fails to mention
that changing the size of long double does NOT change the ABI. Therefore,
calls to functions that use long doubles, eg, <math.h>, scanf(), printf(), ...,
will produce strange results.
gcc documentation has:
Warning: if you override the default value for your target ABI,
this changes the size of structures and arrays containing "long
double" variables, as well as modifying the function calling
convention for functions taking "long double". Hence they are
not binary-compatible with code compiled without that switch.
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