https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122535
Bug ID: 122535
Summary: PowerPC: --with-long-double-64 ignored during
configure
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: target
Assignee: kishan at gcc dot gnu.org
Reporter: kishan at gcc dot gnu.org
CC: jakub at redhat dot com, jeffreyalaw at gmail dot com,
jskumari at gcc dot gnu.org, mmatti at linux dot
vnet.ibm.com,
pinskia at gcc dot gnu.org, rguenth at gcc dot gnu.org,
segher at kernel dot crashing.org
Target Milestone: ---
Target: power64*
This bug is created just to map with a patch
https://inbox.sourceware.org/gcc-patches/[email protected]/
When configuring GCC for PowerPC with --with-long-double-64, the option gets
completely ignored.
No matter what you specify, the compiler still defaults to 128-bit long double.
Test case
=========
#include <stdlib.h>
int main() {
if (sizeof(long double) == 8) return 8;
if (sizeof(long double) == 16) return 16;
return 0;
}
$ ./configure --prefix=/path/to/install --enable-languages=c,c++
--disable-bootstrap \
--disable-libsanitizer --disable-multilib --enable-checking=release
--with-long-double-64
$ make -j
$ ./xgcc -B./ -o test test.c
$ ./test; echo $?
Expected result:
8 (long double = 64-bit)
Actual result:
16 (long double = 128-bit)
--with-long-double-64 is mentioned in install.texi, but configure.ac never
actually checks for it.
The logic only exists for --with-long-double-128 and defaults based on glibc
version ≥ 2.4.
