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glibc/sysdeps/s390/s390-64/configure
Stefan Liebler f5f96b784b s390x: Fix static PIE condition for toolchain bootstrapping. 
The static PIE configure check uses link tests.  When bootstrapping
a cross-toolchain, the link tests fail due to missing crt-files /
libc.so.  As we explicitely want to test an issue in binutils (ld),
we now also explicitely check for known linker versions.

See also commit 368b7c614b
S390: Use compile-only instead of also link-tests in configure.
2023-08-18 10:57:59 +02:00

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# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/s390/s390-64.
# Bypass result of runtime configure check for known linker versions as
# e.g. crt-files or libc.so might not be available in bootstrapping
# environments.
case $($LD --version) in
"GNU gold"*)
# As of 2023-08-07, gold does not support static PIE due to
# Bug 22221 - add --no-dynamic-linker option
# https://sourceware.org/bugzilla/show_bug.cgi?id=22221
libc_cv_s390x_staticpie_req_version=no
;;
"LLD"*)
# As of 2023-08-07, there is no lld which supports s390x.
libc_cv_s390x_staticpie_req_version=no
;;
*)
# The required binutils patches are available with bintuils 2.39
libc_cv_s390x_staticpie_req_version=yes
# Skip AC_CHECK_PROGS and just use the result from main configure.ac.
libc_cv_s390x_staticpie_req_LD=$LD
for ac_prog in $LD
do
# Extract the first word of "$ac_prog", so it can be a program name with args.
set dummy $ac_prog; ac_word=$2
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
printf %s "checking for $ac_word... " >&6; }
if test ${ac_cv_prog_libc_cv_s390x_staticpie_req_LD+y}
then :
printf %s "(cached) " >&6
else $as_nop
if test -n "$libc_cv_s390x_staticpie_req_LD"; then
ac_cv_prog_libc_cv_s390x_staticpie_req_LD="$libc_cv_s390x_staticpie_req_LD" # Let the user override the test.
else
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH
do
IFS=$as_save_IFS
case $as_dir in #(((
'') as_dir=./ ;;
*/) ;;
*) as_dir=$as_dir/ ;;
esac
for ac_exec_ext in '' $ac_executable_extensions; do
if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
ac_cv_prog_libc_cv_s390x_staticpie_req_LD="$ac_prog"
printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
break 2
fi
done
done
IFS=$as_save_IFS
fi
fi
libc_cv_s390x_staticpie_req_LD=$ac_cv_prog_libc_cv_s390x_staticpie_req_LD
if test -n "$libc_cv_s390x_staticpie_req_LD"; then
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_s390x_staticpie_req_LD" >&5
printf "%s\n" "$libc_cv_s390x_staticpie_req_LD" >&6; }
else
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
printf "%s\n" "no" >&6; }
fi
test -n "$libc_cv_s390x_staticpie_req_LD" && break
done
if test -z "$libc_cv_s390x_staticpie_req_LD"; then
ac_verc_fail=yes
else
# Found it, now check the version.
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking version of $libc_cv_s390x_staticpie_req_LD" >&5
printf %s "checking version of $libc_cv_s390x_staticpie_req_LD... " >&6; }
ac_prog_version=`$libc_cv_s390x_staticpie_req_LD --version 2>&1 | sed -n 's/^.*GNU ld.* \([0-9][0-9]*\.[0-9.]*\).*$/\1/p'`
case $ac_prog_version in
'') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
2.1[0-9][0-9]*|2.39*|2.[4-9][0-9]*|[3-9].*|[1-9][0-9]*)
ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;;
*) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;;
esac
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_prog_version" >&5
printf "%s\n" "$ac_prog_version" >&6; }
fi
if test $ac_verc_fail = yes; then
libc_cv_s390x_staticpie_req_version=no
fi
;;
esac
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for s390-specific static PIE requirements (version check)" >&5
printf %s "checking for s390-specific static PIE requirements (version check)... " >&6; }
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_s390x_staticpie_req_version" >&5
printf "%s\n" "$libc_cv_s390x_staticpie_req_version" >&6; }
# Minimal checking for static PIE support in ld.
# Compare to ld testcase/bugzilla:
# <binutils-source>/ld/testsuite/ld-elf/pr22263-1.rd
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for s390-specific static PIE requirements (runtime check)" >&5
printf %s "checking for s390-specific static PIE requirements (runtime check)... " >&6; }
if { as_var=\
libc_cv_s390x_staticpie_req_runtime; eval test \${$as_var+y}; }
then :
printf %s "(cached) " >&6
else $as_nop
cat > conftest1.c <<EOF
__thread int * foo;
void
bar (void)
{
*foo = 1;
}
EOF
cat > conftest2.c <<EOF
extern __thread int *foo;
extern void bar (void);
static int x;
int
main ()
{
foo = &x;
return 0;
}
EOF
libc_cv_s390x_staticpie_req_runtime=no
if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest1.c -o conftest1.o'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } \
&& { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest2.c -o conftest2.o'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } \
&& { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -o conftest conftest1.o conftest2.o'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } \
&& { ac_try='! LC_ALL=C $READELF -Wr conftest | grep R_390_TLS_TPOFF'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then
libc_cv_s390x_staticpie_req_runtime=yes
fi
rm -rf conftest.*
fi
eval ac_res=\$\
libc_cv_s390x_staticpie_req_runtime
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
printf "%s\n" "$ac_res" >&6; }
if test $libc_cv_s390x_staticpie_req_runtime = yes \
|| test $libc_cv_s390x_staticpie_req_version = yes; then
# Static PIE is supported only on 64bit.
# Ensure you also have those patches for:
# - binutils (ld)
# - "[PR ld/22263] s390: Avoid dynamic TLS relocs in PIE"
# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=26b1426577b5dcb32d149c64cca3e603b81948a9
# (Tested by configure check above)
# Otherwise there will be a R_390_TLS_TPOFF relocation, which fails to
# be processed in _dl_relocate_static_pie() as static TLS map is not setup.
# - "s390: Add DT_JMPREL pointing to .rela.[i]plt with static-pie"
# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d942d8db12adf4c9e5c7d9ed6496a779ece7149e
# (We can't test it in configure as we are not able to link a static PIE
# executable if the system glibc lacks static PIE support)
# Otherwise there won't be DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ entries
# and the IFUNC symbols are not processed, which leads to crashes.
#
# - kernel (the mentioned links to the commits belong to 5.19 merge window):
# - "s390/mmap: increase stack/mmap gap to 128MB"
# https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=f2f47d0ef72c30622e62471903ea19446ea79ee2
# - "s390/vdso: move vdso mapping to its own function"
# https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=57761da4dc5cd60bed2c81ba0edb7495c3c740b8
# - "s390/vdso: map vdso above stack"
# https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=9e37a2e8546f9e48ea76c839116fa5174d14e033
# - "s390/vdso: add vdso randomization"
# https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=41cd81abafdc4e58a93fcb677712a76885e3ca25
# (We can't test the kernel of the target system)
# Otherwise if /proc/sys/kernel/randomize_va_space is turned off (0),
# static PIE executables like ldconfig will crash. While startup sbrk is
# used to enlarge the HEAP. Unfortunately the underlying brk syscall fails
# as there is not enough space after the HEAP. Then the address of the TLS
# image is invalid and the following memcpy in __libc_setup_tls() leads
# to a segfault.
# If /proc/sys/kernel/randomize_va_space is activated (default: 2), there
# is enough space after HEAP.
#
# - glibc
# - "Linux: Define MMAP_CALL_INTERNAL"
# https://sourceware.org/git/?p=glibc.git;a=commit;h=c1b68685d438373efe64e5f076f4215723004dfb
# - "i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.S"
# https://sourceware.org/git/?p=glibc.git;a=commit;h=6e5c7a1e262961adb52443ab91bd2c9b72316402
# - "i386: Honor I386_USE_SYSENTER for 6-argument Linux system calls"
# https://sourceware.org/git/?p=glibc.git;a=commit;h=60f0f2130d30cfd008ca39743027f1e200592dff
# - "ia64: Always define IA64_USE_NEW_STUB as a flag macro"
# https://sourceware.org/git/?p=glibc.git;a=commit;h=18bd9c3d3b1b6a9182698c85354578d1d58e9d64
# - "Linux: Implement a useful version of _startup_fatal"
# https://sourceware.org/git/?p=glibc.git;a=commit;h=a2a6bce7d7e52c1c34369a7da62c501cc350bc31
# - "Linux: Introduce __brk_call for invoking the brk system call"
# https://sourceware.org/git/?p=glibc.git;a=commit;h=b57ab258c1140bc45464b4b9908713e3e0ee35aa
# - "csu: Implement and use _dl_early_allocate during static startup"
# https://sourceware.org/git/?p=glibc.git;a=commit;h=f787e138aa0bf677bf74fa2a08595c446292f3d7
# The mentioned patch series by Florian Weimer avoids the mentioned failing
# sbrk syscall by falling back to mmap.
printf "%s\n" "#define SUPPORT_STATIC_PIE 1" >>confdefs.h
fi
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