https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88535
--- Comment #5 from john henning <mailboxnotfound at yahoo dot com> ---
Thank you for the response.
I wonder if the configure or make process should defend against the possibility
that the host compiler and the compiler that we are building today have
differing defaults for -m32 vs -m64.
Consider below, where the /usr/bin compiler is provided by the OS, and the 8.2
is from a build without bootstrap.
$ echo "int main(){}" > tmp.c
$ /usr/bin/gcc tmp.c
$ file a.out
a.out: ELF 64-bit MSB executable SPARCV9 Version 1, dynamically
linked, not stripped, no debugging information
available
$
$ /export/GCC/gcc-8.2.0/bin/gcc tmp.c
$ file a.out
a.out: ELF 32-bit MSB executable SPARC32PLUS Version 1, V8+
Required, dynamically linked, not stripped, no debugging
information available
$
Notice the differing output when one is silent about -m32 / -m64.
(Note: Although the defaults differ, both the above are perfectly happy to
build the non-default version if you are explicit for -m32 or -m64).
Details for the system compiler:
$ /usr/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/gcc/7/lib/gcc/sparcv9-solaris2.11/7.3.0/lto-wrapper
Target: sparcv9-solaris2.11
Configured with:
/builds/ulhg/workspace/Solaris_11u4/Userland/full-build/02b-build-sparc/components/gcc7/gcc-7.3.0/configure
--prefix=/usr/gcc/7 --mandir=/usr/gcc/7/share/man --bindir=/usr/gcc/7/bin
--sbindir=/usr/gcc/7/sbin
--libdir=/usr/gcc/7/lib --infodir=/usr/gcc/7/share/info
--libexecdir=/usr/gcc/7/lib
--enable-languages=c,c++,fortran,objc --enable-shared
--enable-initfini-array --disable-rpath
--with-system-zlib --with-build-config=no --with-gmp-include=/usr/include
--with-mpfr-include=/usr/include
--without-gnu-ld --with-ld=/usr/bin/ld --with-gnu-as
--with-as=/usr/gnu/bin/as
--disable-bootstrap 'BOOT_CFLAGS=-g -O2' sparcv9-solaris2.11
Thread model: posix
gcc version 7.3.0 (GCC)
$
And for the 8.2 without bootstrap:
$ /export/GCC/gcc-8.2.0/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/export/GCC/gcc-8.2.0/bin/gcc
COLLECT_LTO_WRAPPER=/export/GCC/gcc-8.2.0-try1/bin/../libexec/gcc/sparc-sun-solaris2.11/8.2.0/lto-wrapper
Target: sparc-sun-solaris2.11
Configured with: /export/home/johnh/gcc/build/gcc-8.2.0/configure
--enable-languages=c,c++,fortran
--enable-lto --without-system-zlib --with-included-gettext --disable-libvtv
--disable-bootstrap
--with-gnu-as --with-as=/usr/gnu/bin/as --with-gnu-ld
--with-ld=/usr/gnu/bin/ld
--with-pkgversion=johnh-14-Dec-2018 --prefix=/export/GCC/gcc-8.2.0
--with-local-prefix=/export/GCC
Thread model: posix
gcc version 8.2.0 (johnh-14-Dec-2018)
$
