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-rw-r--r--m4/warnings.m498
1 files changed, 82 insertions, 16 deletions
diff --git a/m4/warnings.m4 b/m4/warnings.m4
index 063bc5c..d487636 100644
--- a/m4/warnings.m4
+++ b/m4/warnings.m4
@@ -1,19 +1,12 @@
-# warnings.m4 serial 16
-dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
+# warnings.m4 serial 20
+dnl Copyright (C) 2008-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Simon Josefsson
-# gl_AS_VAR_APPEND(VAR, VALUE)
-# ----------------------------
-# Provide the functionality of AS_VAR_APPEND if Autoconf does not have it.
-m4_ifdef([AS_VAR_APPEND],
-[m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])],
-[m4_define([gl_AS_VAR_APPEND],
-[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
-
+AC_PREREQ([2.64])
# gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED],
# [PROGRAM = AC_LANG_PROGRAM()])
@@ -33,13 +26,13 @@ case $gl_positive in
esac
m4_pushdef([gl_Positive], [$gl_positive])])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], [gl_Warn], [
- gl_save_compiler_FLAGS="$gl_Flags"
- gl_AS_VAR_APPEND(m4_defn([gl_Flags]),
+ gl_saved_compiler_FLAGS="$gl_Flags"
+ AS_VAR_APPEND(m4_defn([gl_Flags]),
[" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["])
AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([[]])])],
[AS_VAR_SET([gl_Warn], [yes])],
[AS_VAR_SET([gl_Warn], [no])])
- gl_Flags="$gl_save_compiler_FLAGS"
+ gl_Flags="$gl_saved_compiler_FLAGS"
])
AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
m4_popdef([gl_Positive])dnl
@@ -88,16 +81,18 @@ AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS_IMPL],
# gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS/WARN_CXXFLAGS],
# [PROGRAM = AC_LANG_PROGRAM()])
# -----------------------------------------------------------
-# Adds parameter to WARN_CFLAGS/WARN_CXXFLAGS if the compiler supports it
-# when compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]).
+# Adds OPTION to VARIABLE (which defaults to WARN_CFLAGS or WARN_CXXFLAGS)
+# if the compiler supports it when compiling PROGRAM.
#
# If VARIABLE is a variable name, AC_SUBST it.
#
# The effects of this macro depend on the current language (_AC_LANG).
+#
+# Example: gl_WARN_ADD([-Wparentheses]).
AC_DEFUN([gl_WARN_ADD],
[AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS(]_AC_LANG[)])
gl_COMPILER_OPTION_IF([$1],
- [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_]_AC_LANG_PREFIX[FLAGS]], [[$2]]), [" $1"])],
+ [AS_VAR_APPEND(m4_if([$2], [], [[WARN_]_AC_LANG_PREFIX[FLAGS]], [[$2]]), [" $1"])],
[],
[$3])
m4_ifval([$2],
@@ -105,6 +100,77 @@ m4_ifval([$2],
[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"
+ dnl If all warnings are inhibited, there's no point in having the GCC
+ dnl analyzer enabled. This saves RAM requirements and CPU consumption.
+ gl_WARN_ADD([-fno-analyzer], [GL_CFLAG_INHIBIT_WARNINGS])
+ ;;
+ 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"
+ dnl If all warnings are inhibited, there's no point in having the GCC
+ dnl analyzer enabled. This saves RAM requirements and CPU consumption.
+ gl_WARN_ADD([-fno-analyzer], [GL_CXXFLAG_INHIBIT_WARNINGS])
+ ;;
+ esac
+ else
+ GL_CXXFLAG_INHIBIT_WARNINGS=''
+ fi
+ AC_SUBST([GL_CXXFLAG_INHIBIT_WARNINGS])
+])
+
+
# Local Variables:
# mode: autoconf
# End: