diff options
Diffstat (limited to 'm4/warnings.m4')
| -rw-r--r-- | m4/warnings.m4 | 96 |
1 files changed, 81 insertions, 15 deletions
diff --git a/m4/warnings.m4 b/m4/warnings.m4 index 560ab6bf946..d487636aa36 100644 --- a/m4/warnings.m4 +++ b/m4/warnings.m4 @@ -1,4 +1,4 @@ -# warnings.m4 serial 16 +# 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, @@ -6,14 +6,7 @@ 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: |