build: beware of Clang++ not supporting POSIXLY_CORRECT

[bison.git] / tests / atlocal.in

diff --git a/tests/atlocal.in b/tests/atlocal.in
index 6f182806cbea751fdd91c2cc4fe186773c7d5b8f..f817f949a2fdea81ad899d3cfa7823d46b4e2321 100644 (file)
--- a/tests/atlocal.in
+++ b/tests/atlocal.in
@@ -16,36 +16,67 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-# We need a C compiler.
-: ${CC='@CC@'}
+# We need `config.h'.
+CPPFLAGS="-I$abs_top_builddir/lib @CPPFLAGS@"
 
-# We want no optimization.
-CFLAGS='@O0CFLAGS@ @WARN_CFLAGS_TEST@ @WERROR_CFLAGS@'
+# Don't just check if $POSIXLY_CORRECT is set, as Bash, when launched
+# as /bin/sh, sets the shell variable POSIXLY_CORRECT to y, but not
+# the environment variable.
+if env | grep '^POSIXLY_CORRECT=' >/dev/null; then
+  POSIXLY_CORRECT_IS_EXPORTED=true
+else
+  POSIXLY_CORRECT_IS_EXPORTED=false
+fi
 
-# Sometimes a test group needs to ignore gcc warnings, so it locally
-# sets CFLAGS to this.
-NO_WERROR_CFLAGS='@O0CFLAGS@ @WARN_CFLAGS_TEST@'
+## ------------------- ##
+## C/C++ Compilation.  ##
+## ------------------- ##
 
-# We need `config.h'.
-CPPFLAGS="-I$abs_top_builddir/lib @CPPFLAGS@"
+: ${CC='@CC@'}
+: ${CXX='@CXX@'}
 
 # Is the compiler GCC?
 GCC='@GCC@'
 
-# The C++ compiler.
-: ${CXX='@CXX@'}
+# Sometimes a test group needs to ignore gcc warnings, so it locally
+# sets CFLAGS to this.
+  NO_WERROR_CFLAGS='@CFLAGS@   @WARN_CFLAGS@   @WARN_CFLAGS_TEST@'
+NO_WERROR_CXXFLAGS='@CXXFLAGS@ @WARN_CXXFLAGS@ @WARN_CXXFLAGS_TEST@'
 
-# If 'exit 77'; skip all C++ tests; otherwise ':'.
+# But most of the time, we want -Werror.
+  CFLAGS="$NO_WERROR_CFLAGS   @WERROR_CFLAGS@"
+CXXFLAGS="$NO_WERROR_CXXFLAGS @WERROR_CXXFLAGS@"
+
+# If 'exit 77'; skip all C/C++ tests; otherwise ':'.
+BISON_C_WORKS='@BISON_C_WORKS@'
 BISON_CXX_WORKS='@BISON_CXX_WORKS@'
 
-# We want no optimization with C++, too.
-CXXFLAGS='@O0CXXFLAGS@ @WARN_CXXFLAGS_TEST@ @WERROR_CFLAGS@'
+# Whether the compiler supports POSIXLY_CORRECT defined.
+: ${C_COMPILER_POSIXLY_CORRECT='@C_COMPILER_POSIXLY_CORRECT@'}
+: ${CXX_COMPILER_POSIXLY_CORRECT='@CXX_COMPILER_POSIXLY_CORRECT@'}
 
-# Are special link options needed?
-LDFLAGS='@LDFLAGS@'
+if $POSIXLY_CORRECT_IS_EXPORTED; then
+  $C_COMPILER_POSIXLY_CORRECT ||
+    BISON_C_WORKS="as_fn_error 77 POSIXLY_CORRECT"
+  $CXX_COMPILER_POSIXLY_CORRECT ||
+    BISON_CXX_WORKS="as_fn_error 77 POSIXLY_CORRECT"
+fi
+
+# Handle --compile-c-with-cxx here, once CXX and CXXFLAGS are known.
+if "$at_arg_compile_c_with_cxx"; then
+  CC_IS_CXX=1
+  CC=$CXX
+  NO_WERROR_CFLAGS=$NO_WERROR_CXXFLAGS
+  CFLAGS=$CXXFLAGS
+  BISON_C_WORKS=$BISON_CXX_WORKS
+else
+  CC_IS_CXX=0
+fi
 
-# Are special libraries needed?
-LIBS="$abs_top_builddir/lib/libbison.a @LIBS@ @INTLLIBS@"
+
+## ------- ##
+## Other.  ##
+## ------- ##
 
 # Empty if no javac was found
 CONF_JAVAC='@CONF_JAVAC@'
@@ -53,8 +84,20 @@ CONF_JAVAC='@CONF_JAVAC@'
 # Empty if no Java VM was found
 CONF_JAVA='@CONF_JAVA@'
 
+# We need egrep.
+: ${EGREP='@EGREP@'}
+
+# Use simple quotes (lib/quote.c).
+LC_CTYPE=C
+export LC_CTYPE
+
+# Are special link options needed?
+LDFLAGS='@LDFLAGS@'
+
+# Are special libraries needed?
+LIBS="$abs_top_builddir/lib/libbison.a @LIBS@ @INTLLIBS@"
+
 # Empty if no xsltproc was found
 : ${XSLTPROC='@XSLTPROC@'}
 
-# We need egrep.
-: ${EGREP='@EGREP@'}
+: ${PERL='@PERL@'}