Look closer at the lines you've just quoted:
if $CC -Wa,--fatal-warnings $CFLAGS -c conftest1.s > /dev/null
2>&1 && \
$CC conftest2.c conftest1.o > /dev/null 2>&1 ; then
See the $CFLAGS for the first GCC call? It's missing for the second.
So you get that actually executed:
+ gcc -Wa,--fatal-warnings -m64 -Wall -fexceptions -c conftest1.s
+ gcc conftest2.c conftest1.o
The first succeeds, creates a 64 bit object. The second fails, because
it tries to link a 64 bit object in 32 bit mode (the default).
Add a $CFLAGS, it'll work better. Report upstream too.
Laurent
On 13/03/2015 17:16, Riccardo Mottola wrote:
Hi,
the other thread reached a too deep reply level and got a bit out of
topic :) The summary is: the toolchain supports unwind section type
returns no even if it should return yes. This makes solaris-x86-64 fail.
The test is executed only if target is X86_64, this is why we weren't
seeing the test in the 32bit build.
The full test check in configure.ac is:
if test x$TARGET = xX86_64; then
AC_CACHE_CHECK([toolchain supports unwind section type],
libffi_cv_as_x86_64_unwind_section_type, [
cat > conftest1.s << EOF
.text
.globl foo
foo:
jmp bar
.section .eh_frame,"a",@unwind
bar:
EOF
cat > conftest2.c << EOF
extern void foo();
int main(){foo();}
EOF
libffi_cv_as_x86_64_unwind_section_type=no
# we ensure that we can compile _and_ link an assembly file
containing an @unwind section
# since the compiler can support it and not the linker (ie old
binutils)
if $CC -Wa,--fatal-warnings $CFLAGS -c conftest1.s > /dev/null
2>&1 && \
$CC conftest2.c conftest1.o > /dev/null 2>&1 ; then
libffi_cv_as_x86_64_unwind_section_type=yes
fi
])
if test "x$libffi_cv_as_x86_64_unwind_section_type" = xyes; then
AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1,
[Define if your assembler supports unwind section
type.])
fi
fi
it links with $CC a small piece with assembler and tries to see if there
are warnings.
I created the two files manually, I tried:
gcc -Wa,--fatal-warnings -m64 -c conftest1.s
and got no error. (without -m64, I would get an unrecognized section type)
then I do:
cc -m64 conftest2.c conftest1.o
and get no errors, so the test should pass.
What's wrong?
Riccardo
