summary refs log tree commit diff
path: root/configure.ac
diff options
context:
space:
mode:
authorFangrui Song <maskray@google.com>2021-08-30 13:59:33 -0700
committerFangrui Song <maskray@google.com>2021-08-31 20:23:34 -0700
commit224edada607ebc6aaa1aadaae423128fae7880df (patch)
tree95f5da42b7f141f21bb460049257a6f34a2a7ce0 /configure.ac
parent60dfb30976761c9b20a22f18356e0c3e581f5394 (diff)
downloadglibc-224edada607ebc6aaa1aadaae423128fae7880df.tar.gz
glibc-224edada607ebc6aaa1aadaae423128fae7880df.tar.xz
glibc-224edada607ebc6aaa1aadaae423128fae7880df.zip
configure: Allow LD to be LLD 13.0.0 or above [BZ #26558]
When using LLD (LLVM linker) as the linker, configure prints a confusing
message.

    *** These critical programs are missing or too old: GNU ld

LLD>=13.0.0 can build glibc --enable-static-pie. (8.0.0 needs one
workaround for -Wl,-defsym=_begin=0. 9.0.0 works with
--disable-static-pie).

XFAIL two tests sysdeps/x86/tst-ifunc-isa-* which have the BZ #28154
issue (LLD follows the PowerPC port of GNU ld for ifunc by placing
IRELATIVE relocations in .rela.dyn, triggering a glibc ifunc fragility).

The set of dynamic symbols is the same with GNU ld and LLD,
modulo unused SHN_ABS version node symbols.

For comparison, gold does not support --enable-static-pie
yet (--no-dynamic-linker is unsupported BZ #22221), yet
has 6 failures more than LLD. gold linked libc.so has
larger .dynsym differences with GNU ld and LLD
(non-default version symbols are changed to default versions
by a version script BZ #28196).
Diffstat (limited to 'configure.ac')
-rw-r--r--configure.ac23
1 files changed, 18 insertions, 5 deletions
diff --git a/configure.ac b/configure.ac
index e250f0e20b..d9232418de 100644
--- a/configure.ac
+++ b/configure.ac
@@ -995,18 +995,31 @@ AC_CHECK_PROG_VER(AS, $AS, --version,
 		  [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 		  AS=: critic_missing="$critic_missing as")
 
-if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
+libc_cv_with_lld=no
+case $($LD --version) in
+  "GNU gold"*)
   # Accept gold 1.14 or higher
-  AC_CHECK_PROG_VER(LD, $LD, --version,
+    AC_CHECK_PROG_VER(LD, $LD, --version,
 		    [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
 		    [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
 		    LD=: critic_missing="$critic_missing GNU gold")
-else
-  AC_CHECK_PROG_VER(LD, $LD, --version,
+    ;;
+  "LLD"*)
+  # Accept LLD 13.0.0 or higher
+    AC_CHECK_PROG_VER(LD, $LD, --version,
+		    [LLD.* \([0-9][0-9]*\.[0-9.]*\)],
+		    [1[3-9].*|[2-9][0-9].*],
+		    LD=: critic_missing="$critic_missing LLD")
+    libc_cv_with_lld=yes
+    ;;
+  *)
+    AC_CHECK_PROG_VER(LD, $LD, --version,
 		    [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
 		    [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 		    LD=: critic_missing="$critic_missing GNU ld")
-fi
+    ;;
+esac
+LIBC_CONFIG_VAR([with-lld], [$libc_cv_with_lld])
 
 # These programs are version sensitive.
 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,