[gcc(refs/users/marxin/heads/PR106156-fix-riscv64-lto-plugin)] lto-plugin: Add path to libatomic for riscv64

[gcc(refs/users/marxin/heads/PR106156-fix-riscv64-lto-plugin)] lto-plugin: Add path to libatomic for riscv64

[Martin Liska]

https://gcc.gnu.org/g:2e7e398c4ed3def5042f26a1a0f87f4ca4dafc98

commit 2e7e398c4ed3def5042f26a1a0f87f4ca4dafc98
Author: Martin Liska <mliska@suse.cz>
Date:   Mon Jul 4 13:29:38 2022 +0200

    lto-plugin: Add path to libatomic for riscv64
    
    Similarly to libgo, we need to provide -L for targets where
    libpthread does depends on libatomic.
    
            PR bootstrap/106156
    
    lto-plugin/ChangeLog:
    
            * Makefile.am: Use PTHREAD_CFLAGS.
            * Makefile.in: Regenerate.
            * configure.ac: Detect if PTHREAD_CFLAGS should contain path
            to libatomic.
            * configure: Regenerate.

Diff:
---
 lto-plugin/Makefile.am  |  2 +-
 lto-plugin/Makefile.in  |  3 ++-
 lto-plugin/configure    | 34 ++++++++++++++++++++++++++++++++--
 lto-plugin/configure.ac | 17 +++++++++++++++++
 4 files changed, 52 insertions(+), 4 deletions(-)

diff --git a/lto-plugin/Makefile.am b/lto-plugin/Makefile.am
index 81362eafc36..64a6bc8c943 100644
--- a/lto-plugin/Makefile.am
+++ b/lto-plugin/Makefile.am
@@ -10,7 +10,7 @@ libexecsubdir := $(libexecdir)/gcc/$(real_target_noncanonical)/$(gcc_version)$(a
 AM_CPPFLAGS = -I$(top_srcdir)/../include $(DEFS)
 AM_CFLAGS = @ac_lto_plugin_warn_cflags@ $(CET_HOST_FLAGS)
 # The plug-in depends on pthreads.
-AM_LDFLAGS = -pthread @ac_lto_plugin_ldflags@
+AM_LDFLAGS = $(PTHREAD_CFLAGS) @ac_lto_plugin_ldflags@
 AM_LIBTOOLFLAGS = --tag=disable-static
 override CFLAGS := $(filter-out -fsanitize=address -fsanitize=hwaddress,$(CFLAGS))
 override LDFLAGS := $(filter-out -fsanitize=address -fsanitize=hwaddress,$(LDFLAGS))
diff --git a/lto-plugin/Makefile.in b/lto-plugin/Makefile.in
index 2033dd9b7c2..de19c8873de 100644
--- a/lto-plugin/Makefile.in
+++ b/lto-plugin/Makefile.in
@@ -264,6 +264,7 @@ PACKAGE_TARNAME = @PACKAGE_TARNAME@
 PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
+PTHREAD_CFLAGS = @PTHREAD_CFLAGS@
 RANLIB = @RANLIB@
 SED = @SED@
 SET_MAKE = @SET_MAKE@
@@ -345,7 +346,7 @@ libexecsubdir := $(libexecdir)/gcc/$(real_target_noncanonical)/$(gcc_version)$(a
 AM_CPPFLAGS = -I$(top_srcdir)/../include $(DEFS)
 AM_CFLAGS = @ac_lto_plugin_warn_cflags@ $(CET_HOST_FLAGS)
 # The plug-in depends on pthreads.
-AM_LDFLAGS = -pthread @ac_lto_plugin_ldflags@
+AM_LDFLAGS = $(PTHREAD_CFLAGS) @ac_lto_plugin_ldflags@
 AM_LIBTOOLFLAGS = --tag=disable-static
 libexecsub_LTLIBRARIES = liblto_plugin.la
 in_gcc_libs = $(foreach lib, $(libexecsub_LTLIBRARIES), $(gcc_build_dir)/$(lib))
diff --git a/lto-plugin/configure b/lto-plugin/configure
index aaa91a63623..aa35bd94b3f 100755
--- a/lto-plugin/configure
+++ b/lto-plugin/configure
@@ -650,6 +650,7 @@ LD
 FGREP
 SED
 LIBTOOL
+PTHREAD_CFLAGS
 LTO_PLUGIN_USE_SYMVER_SUN_FALSE
 LTO_PLUGIN_USE_SYMVER_SUN_TRUE
 LTO_PLUGIN_USE_SYMVER_GNU_FALSE
@@ -6020,6 +6021,35 @@ fi
 
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether -pthread is supported" >&5
+$as_echo_n "checking whether -pthread is supported... " >&6; }
+if ${lto_plugin_cv_lib_pthread+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  CFLAGS_hold=$CFLAGS
+CFLAGS="$CFLAGS -pthread -L../$build/libatomic/.libs"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int i;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  lto_plugin_cv_lib_pthread=yes
+else
+  lto_plugin_cv_lib_pthread=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+CFLAGS=$CFLAGS_hold
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $lto_plugin_cv_lib_pthread" >&5
+$as_echo "$lto_plugin_cv_lib_pthread" >&6; }
+PTHREAD_CFLAGS=
+if test "$libgo_cv_lib_pthread" = yes; then
+  # RISC-V apparently adds -latomic when using -pthread.
+  PTHREAD_CFLAGS="-pthread -L../$build/libatomic/.libs"
+fi
+
+
+
 case `pwd` in
   *\ * | *\	*)
     { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Libtool does not cope well with whitespace in \`pwd\`" >&5
@@ -12091,7 +12121,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12094 "configure"
+#line 12124 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12197,7 +12227,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12200 "configure"
+#line 12230 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/lto-plugin/configure.ac b/lto-plugin/configure.ac
index c2ec512880f..ba34a5d0ca1 100644
--- a/lto-plugin/configure.ac
+++ b/lto-plugin/configure.ac
@@ -91,6 +91,23 @@ AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_SUN, [test "x$lto_plugin_use_symver" = xsun
 AC_CHECK_HEADER(pthread.h,
   [AC_DEFINE(HAVE_PTHREAD_H, 1, [Define to 1 if pthread.h is present.])])
 
+dnl Test whether the compiler supports the -pthread option.
+AC_CACHE_CHECK([whether -pthread is supported],
+[lto_plugin_cv_lib_pthread],
+[CFLAGS_hold=$CFLAGS
+CFLAGS="$CFLAGS -pthread -L../$build/libatomic/.libs"
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
+[lto_plugin_cv_lib_pthread=yes],
+[lto_plugin_cv_lib_pthread=no])
+CFLAGS=$CFLAGS_hold])
+PTHREAD_CFLAGS=
+if test "$libgo_cv_lib_pthread" = yes; then
+  # RISC-V apparently adds -latomic when using -pthread.
+  PTHREAD_CFLAGS="-pthread -L../$build/libatomic/.libs"
+fi
+AC_SUBST(PTHREAD_CFLAGS)
+
+
 AM_PROG_LIBTOOL
 ACX_LT_HOST_FLAGS
 AC_SUBST(target_noncanonical)