libiberty: Append <libgen.h> to AC_CHECK_DECLS [PR119218].

Darwin and Solaris, at least, provide basename() in libc, but only
declare it in <libgen.h>.  That library is not one of the set in
AC_INCLUDES_DEFAULT and so we fail the config test and fall back
to the libiberty-provided version.  In itself, this is not an
issue; however, if we include <libgen.h> and libiberty.h in the same
TU we do then get a decl conflict.

	PR other/119218

libiberty/ChangeLog:

	* config.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Append <libgen.h> to AC_INCLUDES_DEFAULT
	when checking for the 'basename' decl.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

3 files changed, 19 insertions, 5 deletions

diff --git a/libiberty/config.in b/libiberty/config.in
index 1b1f2b0..b055150 100644
--- a/libiberty/config.in
+++ b/libiberty/config.in
@@ -153,6 +153,9 @@
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
+/* Define to 1 if you have the <libgen.h> header file. */
+#undef HAVE_LIBGEN_H
+
 /* Define to 1 if you have the <limits.h> header file. */
 #undef HAVE_LIMITS_H
 
diff --git a/libiberty/configure b/libiberty/configure
index 38856a0..347719c 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -5745,7 +5745,7 @@ host_makefile_frag=${frag}
 # It's OK to check for header files.  Although the compiler may not be
 # able to link anything, it had better be able to at least compile
 # something.
-for ac_header in sys/file.h sys/param.h limits.h stdlib.h malloc.h string.h unistd.h strings.h sys/time.h time.h sys/resource.h sys/stat.h sys/mman.h fcntl.h alloca.h sys/pstat.h sys/sysmp.h sys/sysinfo.h machine/hal_sysinfo.h sys/table.h sys/sysctl.h sys/systemcfg.h stdint.h stdio_ext.h process.h sys/prctl.h spawn.h
+for ac_header in sys/file.h sys/param.h limits.h stdlib.h malloc.h string.h unistd.h strings.h sys/time.h time.h sys/resource.h sys/stat.h sys/mman.h fcntl.h alloca.h sys/pstat.h sys/sysmp.h sys/sysinfo.h machine/hal_sysinfo.h sys/table.h sys/sysctl.h sys/systemcfg.h stdint.h stdio_ext.h process.h sys/prctl.h spawn.h libgen.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_preproc "$LINENO" "$ac_header" "$as_ac_Header"
@@ -7389,7 +7389,12 @@ fi
 done
 
   as_ac_Symbol=`$as_echo "ac_cv_have_decl_basename(char *)" | $as_tr_sh`
-ac_fn_c_check_decl "$LINENO" "basename(char *)" "$as_ac_Symbol" "$ac_includes_default"
+ac_fn_c_check_decl "$LINENO" "basename(char *)" "$as_ac_Symbol" "
+$ac_includes_default
+#ifdef HAVE_LIBGEN_H
+# include <libgen.h>
+#endif
+"
 if eval test \"x\$"$as_ac_Symbol"\" = x"yes"; then :
   ac_have_decl=1
 else
@@ -7399,7 +7404,8 @@ fi
 cat >>confdefs.h <<_ACEOF
 #define HAVE_DECL_BASENAME $ac_have_decl
 _ACEOF
-ac_fn_c_check_decl "$LINENO" "ffs" "ac_cv_have_decl_ffs" "$ac_includes_default"
+
+  ac_fn_c_check_decl "$LINENO" "ffs" "ac_cv_have_decl_ffs" "$ac_includes_default"
 if test "x$ac_cv_have_decl_ffs" = xyes; then :
   ac_have_decl=1
 else
diff --git a/libiberty/configure.ac b/libiberty/configure.ac
index c27e08e..5bad0f9 100644
--- a/libiberty/configure.ac
+++ b/libiberty/configure.ac
@@ -291,7 +291,7 @@ AC_SUBST_FILE(host_makefile_frag)
 # It's OK to check for header files.  Although the compiler may not be
 # able to link anything, it had better be able to at least compile
 # something.
-AC_CHECK_HEADERS(sys/file.h sys/param.h limits.h stdlib.h malloc.h string.h unistd.h strings.h sys/time.h time.h sys/resource.h sys/stat.h sys/mman.h fcntl.h alloca.h sys/pstat.h sys/sysmp.h sys/sysinfo.h machine/hal_sysinfo.h sys/table.h sys/sysctl.h sys/systemcfg.h stdint.h stdio_ext.h process.h sys/prctl.h spawn.h)
+AC_CHECK_HEADERS(sys/file.h sys/param.h limits.h stdlib.h malloc.h string.h unistd.h strings.h sys/time.h time.h sys/resource.h sys/stat.h sys/mman.h fcntl.h alloca.h sys/pstat.h sys/sysmp.h sys/sysinfo.h machine/hal_sysinfo.h sys/table.h sys/sysctl.h sys/systemcfg.h stdint.h stdio_ext.h process.h sys/prctl.h spawn.h libgen.h)
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIME
 
@@ -723,7 +723,12 @@ if test -z "${setobjs}"; then
     [AC_MSG_RESULT([no])])
 
   AC_CHECK_FUNCS($checkfuncs)
-  AC_CHECK_DECLS([basename(char *), ffs, asprintf, vasprintf, snprintf, vsnprintf])
+  AC_CHECK_DECLS([basename(char *)], [], [], [
+AC_INCLUDES_DEFAULT
+#ifdef HAVE_LIBGEN_H
+# include <libgen.h>
+#endif])
+  AC_CHECK_DECLS([ffs, asprintf, vasprintf, snprintf, vsnprintf])
   AC_CHECK_DECLS([calloc, getenv, getopt, malloc, realloc])
   case "${host}" in
       *-*-darwin*) ;; # Darwin's sbrk implementation is deprecated.