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{branch-2.6} tests: beware of compilers that do not support POSIXLY_CORR
From: |
Akim Demaille |
Subject: |
{branch-2.6} tests: beware of compilers that do not support POSIXLY_CORRECT |
Date: |
Wed, 7 Nov 2012 17:28:36 +0100 |
commit 0a36880ad19791ebf050f884df3a1aff151cd67f
Author: Akim Demaille <address@hidden>
Date: Wed Nov 7 17:23:06 2012 +0100
tests: beware of compilers that do not support POSIXLY_CORRECT
Running "maintainer-release-check" on OS X with Clang 2.9 fails,
because "clang-mp-2.9 -o test -g test.c" launches "/usr/bin/dsymutil
test -o test.dSYM" which fails with "error: unable to open executable
'-o'".
* m4/c-working.m4 (BISON_CHECK_WITH_POSIXLY_CORRECT)
(BISON_C_COMPILER_POSIXLY_CORRECT): New.
* configure.ac: Use the latter.
* tests/atlocal.in (POSIXLY_CORRECT_IS_EXPORTED): New.
* tests/local.at (AT_BISON_CHECK_WARNINGS_): Use it instead of computing its
value each time.
(AT_QUELL_VALGRIND): Skip tests that cannot work because of compilers
that do not support POSIXLY_CORRECT.
diff --git a/configure.ac b/configure.ac
index 651fa13..86783d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -114,6 +114,7 @@ fi
BISON_TEST_FOR_WORKING_C_COMPILER
BISON_TEST_FOR_WORKING_CXX_COMPILER
+BISON_C_COMPILER_POSIXLY_CORRECT
AC_ARG_ENABLE([yacc],
[AC_HELP_STRING([--disable-yacc],
diff --git a/m4/c-working.m4 b/m4/c-working.m4
index d563d32..0db60f7 100644
--- a/m4/c-working.m4
+++ b/m4/c-working.m4
@@ -25,3 +25,47 @@ AC_DEFUN([BISON_TEST_FOR_WORKING_C_COMPILER], [
[],
[AC_MSG_FAILURE([cannot compile a simple C program])])
])
+
+# BISON_CHECK_WITH_POSIXLY_CORRECT(CODE)
+# --------------------------------------
+# Run the Autoconf CODE with POSIXLY_CORRECT set to 1, and restored to
+# its initial value afterwards.
+AC_DEFUN([BISON_CHECK_WITH_POSIXLY_CORRECT],
+[gl_awk_probe='BEGIN { if ("POSIXLY_CORRECT" in ENVIRON) print "x" }'
+case ${POSIXLY_CORRECT+x}`$AWK "$gl_awk_probe" </dev/null` in
+ xx) gl_had_POSIXLY_CORRECT=exported ;;
+ x) gl_had_POSIXLY_CORRECT=yes ;;
+ *) gl_had_POSIXLY_CORRECT= ;;
+esac
+POSIXLY_CORRECT=1
+export POSIXLY_CORRECT
+$1
+case $gl_had_POSIXLY_CORRECT in
+ exported) ;;
+ yes) AS_UNSET([POSIXLY_CORRECT]); POSIXLY_CORRECT=1 ;;
+ *) AS_UNSET([POSIXLY_CORRECT]) ;;
+esac
+])
+
+# BISON_C_COMPILER_POSIXLY_CORRECT
+# --------------------------------
+# Whether the compiler supports -g in POSIXLY_CORRECT mode. clang-2.9
+# on OS X does not, because "clang-mp-2.9 -o test -g test.c" launches
+# "/usr/bin/dsymutil test -o test.dSYM" which fails with "error:
+# unable to open executable '-o'".
+#
+# Sets C_COMPILER_POSIXLY_CORRECT to true/false.
+AC_DEFUN([BISON_C_COMPILER_POSIXLY_CORRECT],
+[AC_CACHE_CHECK([whether $CC supports POSIXLY_CORRECT=1],
+ [bison_cv_cc_supports_posixly_correct],
+[BISON_CHECK_WITH_POSIXLY_CORRECT(
+[AC_LANG_PUSH([C])
+AC_LINK_IFELSE([AC_LANG_PROGRAM],
+ [bison_cv_cc_supports_posixly_correct=yes],
+ [bison_cv_cc_supports_posixly_correct=no])
+AC_LANG_POP([C])])])
+case $bison_cv_cc_supports_posixly_correct in
+ yes) AC_SUBST([C_COMPILER_POSIXLY_CORRECT], [true]) ;;
+ no) AC_SUBST([C_COMPILER_POSIXLY_CORRECT], [false]);;
+esac
+])
diff --git a/tests/atlocal.in b/tests/atlocal.in
index 2f68259..5e3cb72 100644
--- a/tests/atlocal.in
+++ b/tests/atlocal.in
@@ -79,3 +79,13 @@ LIBS="$abs_top_builddir/lib/libbison.a @LIBS@ @INTLLIBS@"
: ${XSLTPROC='@XSLTPROC@'}
: ${PERL='@PERL@'}
+
+# 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.
+: ${C_COMPILER_POSIXLY_CORRECT='@C_COMPILER_POSIXLY_CORRECT@'}
+if env | grep '^POSIXLY_CORRECT=' >/dev/null; then
+ POSIXLY_CORRECT_IS_EXPORTED=true
+else
+ POSIXLY_CORRECT_IS_EXPORTED=false
+fi
diff --git a/tests/local.at b/tests/local.at
index 8882521..e803e57 100644
--- a/tests/local.at
+++ b/tests/local.at
@@ -468,11 +468,7 @@ m4_define([AT_BISON_CHECK_WARNINGS_],
[[# Defining POSIXLY_CORRECT causes bison to complain if options are
# added after the grammar file name, so skip these checks in that
# case.
-#
-# Don't just check if $POSIXLY_CORRECT is set, as Bash, when launched
-# as /bin/sh, sets the shell variable POSIXLY_CORRECT to y, but not
-# the environment variable.
-if env | grep '^POSIXLY_CORRECT=' >/dev/null; then :; else
+if test "$POSIXLY_CORRECT_IS_EXPORTED" = false; then
]AT_SAVE_SPECIAL_FILES[
# To avoid expanding it repeatedly, store specified stdout.
@@ -597,7 +593,10 @@ m4_define([AT_QUELL_VALGRIND],
# otherwise pass "-c"; this is a hack. The default SOURCES is OUTPUT
# with trailing .o removed, and ".c" appended.
m4_define([AT_COMPILE],
-[AT_CHECK(m4_join([ ],
+[AT_CHECK([case $POSIXLY_CORRECT_IS_EXPORTED:$C_COMPILER_POSIXLY_CORRECT in
+ true:false) echo 'cannot compile properly with POSIXLY_CORRECT' && exit 77;;
+esac])
+AT_CHECK(m4_join([ ],
[$CC $CFLAGS $CPPFLAGS],
[m4_bmatch([$1], [[.]], [-c], [$LDFLAGS])],
[-o $1],
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