-# warnings.m4 serial 17
+# warnings.m4 serial 18
dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
[AC_SUBST([WARN_]_AC_LANG_PREFIX[FLAGS])])dnl
])
+
+# gl_CC_INHIBIT_WARNINGS
+# sets and substitutes a variable GL_CFLAG_INHIBIT_WARNINGS, to a $(CC) option
+# that reverts all preceding -W* options, if available.
+# This is expected to be '-w' at least on gcc, clang, AIX xlc, xlclang, Sun cc,
+# "compile cl" (MSVC), "compile clang-cl" (MSVC-compatible clang). Or it can be
+# empty.
+AC_DEFUN([gl_CC_INHIBIT_WARNINGS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_CACHE_CHECK([for C compiler option to inhibit all warnings],
+ [gl_cv_cc_winhibit],
+ [rm -f conftest*
+ echo 'int dummy;' > conftest.c
+ AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c 2>conftest1.err]) >/dev/null
+ AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -w -c conftest.c 2>conftest2.err]) >/dev/null
+ if test $? = 0 && test `wc -l < conftest1.err` = `wc -l < conftest2.err`; then
+ gl_cv_cc_winhibit='-w'
+ else
+ gl_cv_cc_winhibit=none
+ fi
+ rm -f conftest*
+ ])
+ case "$gl_cv_cc_winhibit" in
+ none) GL_CFLAG_INHIBIT_WARNINGS='' ;;
+ *) GL_CFLAG_INHIBIT_WARNINGS="$gl_cv_cc_winhibit" ;;
+ esac
+ AC_SUBST([GL_CFLAG_INHIBIT_WARNINGS])
+])
+
+# gl_CXX_INHIBIT_WARNINGS
+# sets and substitutes a variable GL_CXXFLAG_INHIBIT_WARNINGS, to a $(CC) option
+# that reverts all preceding -W* options, if available.
+AC_DEFUN([gl_CXX_INHIBIT_WARNINGS],
+[
+ dnl Requires AC_PROG_CXX or gl_PROG_ANSI_CXX.
+ if test -n "$CXX" && test "$CXX" != no; then
+ AC_CACHE_CHECK([for C++ compiler option to inhibit all warnings],
+ [gl_cv_cxx_winhibit],
+ [rm -f conftest*
+ echo 'int dummy;' > conftest.cc
+ AC_TRY_COMMAND([${CXX-c++} $CXXFLAGS $CPPFLAGS -c conftest.cc 2>conftest1.err]) >/dev/null
+ AC_TRY_COMMAND([${CXX-c++} $CXXFLAGS $CPPFLAGS -w -c conftest.cc 2>conftest2.err]) >/dev/null
+ if test $? = 0 && test `wc -l < conftest1.err` = `wc -l < conftest2.err`; then
+ gl_cv_cxx_winhibit='-w'
+ else
+ gl_cv_cxx_winhibit=none
+ fi
+ rm -f conftest*
+ ])
+ case "$gl_cv_cxx_winhibit" in
+ none) GL_CXXFLAG_INHIBIT_WARNINGS='' ;;
+ *) GL_CXXFLAG_INHIBIT_WARNINGS="$gl_cv_cxx_winhibit" ;;
+ esac
+ else
+ GL_CXXFLAG_INHIBIT_WARNINGS=''
+ fi
+ AC_SUBST([GL_CXXFLAG_INHIBIT_WARNINGS])
+])
+
+
# Local Variables:
# mode: autoconf
# End: