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build: beware of Clang++ not supporting POSIXLY_CORRECT

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* m4/c-working.m4 (BISON_LANG_COMPILER_POSIXLY_CORRECT): New.
(BISON_C_COMPILER_POSIXLY_CORRECT): Use it.
For consistency with C++, also define BISON_C_WORKS.
* m4/cxx.m4 (BISON_CXX_COMPILER_POSIXLY_CORRECT): New.
* configure.ac: Use it.
* tests/atlocal.in: Get its result.
Propagate properly CXX values when used to compile C.
When POSIXLY_CORRECT, adjust BISON_C_WORKS and BISON_CXX_WORKS.
* tests/local.at (AT_COMPILE): Use BISON_C_WORKS.
This commit is contained in:
Akim Demaille
2012-12-08 19:33:50 +01:00
parent 09a1cd5e58
commit d4728d92c7
5 changed files with 61 additions and 33 deletions
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34
tests/atlocal.in
View File

@@ -19,6 +19,15 @@
# We need `config.h'.
CPPFLAGS="-I$abs_top_builddir/lib @CPPFLAGS@"
# Don't just check if $POSIXLY_CORRECT is set, as Bash, when launched
# as /bin/sh, sets the shell variable POSIXLY_CORRECT to y, but not
# the environment variable.
if env | grep '^POSIXLY_CORRECT=' >/dev/null; then
POSIXLY_CORRECT_IS_EXPORTED=true
else
POSIXLY_CORRECT_IS_EXPORTED=false
fi
## ------------------- ##
## C/C++ Compilation. ##
## ------------------- ##
@@ -38,15 +47,28 @@ NO_WERROR_CXXFLAGS='@CXXFLAGS@ @WARN_CXXFLAGS@ @WARN_CXXFLAGS_TEST@'
CFLAGS="$NO_WERROR_CFLAGS @WERROR_CFLAGS@"
CXXFLAGS="$NO_WERROR_CXXFLAGS @WERROR_CXXFLAGS@"
# If 'exit 77'; skip all C++ tests; otherwise ':'.
# If 'exit 77'; skip all C/C++ tests; otherwise ':'.
BISON_C_WORKS='@BISON_C_WORKS@'
BISON_CXX_WORKS='@BISON_CXX_WORKS@'
# Whether the compiler supports POSIXLY_CORRECT defined.
: ${C_COMPILER_POSIXLY_CORRECT='@C_COMPILER_POSIXLY_CORRECT@'}
: ${CXX_COMPILER_POSIXLY_CORRECT='@CXX_COMPILER_POSIXLY_CORRECT@'}
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
@@ -79,13 +101,3 @@ 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

4
tests/local.at
View File

@@ -600,9 +600,7 @@ 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([case $POSIXLY_CORRECT_IS_EXPORTED:$C_COMPILER_POSIXLY_CORRECT in
true:false) echo 'cannot compile properly with POSIXLY_CORRECT' && exit 77;;
esac])
[AT_CHECK([$BISON_C_WORKS], 0, ignore, ignore)
AT_CHECK(m4_join([ ],
[$CC $CFLAGS $CPPFLAGS],
[m4_bmatch([$1], [[.]], [-c], [$LDFLAGS])],