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Improve IFUNC check [BZ #25506]

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GNU ld's RISCV port does not support IFUNC. ld -no-pie produces no
relocation and the test passed incorrectly. Be more rigid by testing
IRELATIVE explicitly.

Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit 87a698a216)
This commit is contained in:
Fangrui Song 2020-02-04 21:55:44 -08:00 committed by Aurelien Jarno
parent 9f997ceca2
commit f2d95cf030
2 changed files with 2 additions and 2 deletions
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2
configure vendored
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@ -4035,7 +4035,7 @@ if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
-o conftest conftest.S 1>&5 2>&5; then
# Do a link to see if the backend supports IFUNC relocs.
$READELF -r conftest 1>&5
LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
LC_ALL=C $READELF -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && {
libc_cv_ld_gnu_indirect_function=yes
}
fi

2
configure.ac
View File

@ -649,7 +649,7 @@ if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
-o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
# Do a link to see if the backend supports IFUNC relocs.
$READELF -r conftest 1>&AS_MESSAGE_LOG_FD
LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
LC_ALL=C $READELF -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && {
libc_cv_ld_gnu_indirect_function=yes
}
fi