https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88195
Bug ID: 88195
Summary: misleading error message for unsupported builtin
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: andi-gcc at firstfloor dot org
Target Milestone: ---
Target: x86_64
On x86, when using a builtin that is not supported by the target configuration,
e.g.
gcc -c -m32 -ptwrite t.c.c
with t.c being
void f(void)
{
__builtin_ia32_ptwrite64 (1);
}
I get
t.c:4:2: error: '__builtin_ia32_ptwrite64' needs isa option -mx32 -mptwrite
While technically correct, -mx32 would enable the 64bit builtin, I suspect for
near all users they would like to use -m64, or better not specifying -m32. So
it should mention that it is incompatible with -m32.
