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comparison m4/manywarnings-c++.m4 @ 39906:39f09bed8945

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Make better use of Autoconf. * m4/environ.m4: Use AC_CACHE_CHECK where possible. * m4/manywarnings.m4: Likewise. * m4/manywarnings-c++.m4: Likewise. * m4/socklen.m4: Likewise. * m4/sockpfaf.m4: Likewise. * m4/stdarg.m4: Likewise. * m4/visibility.m4: Likewise. * m4/fsusage.m4: Use AC_CACHE_CHECK where possible. Modernize indentation. * m4/ls-mntd-fs.m4: Likewise.
author Bruno Haible <bruno@clisp.org>
date Fri, 12 Oct 2018 02:42:44 +0200
parents 65d6b6e14d50
children b06060465f09
comparison
equal deleted inserted replaced
39905:c3122bb580fe 39906:39f09bed8945
1 # manywarnings-c++.m4 serial 2 1 # manywarnings-c++.m4 serial 3
2 dnl Copyright (C) 2008-2018 Free Software Foundation, Inc. 2 dnl Copyright (C) 2008-2018 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation 3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it, 4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved. 5 dnl with or without modifications, as long as this notice is preserved.
6 6
15 AC_REQUIRE([AC_PROG_CXX]) 15 AC_REQUIRE([AC_PROG_CXX])
16 if test -n "$GXX"; then 16 if test -n "$GXX"; then
17 17
18 dnl Check if -W -Werror -Wno-missing-field-initializers is supported 18 dnl Check if -W -Werror -Wno-missing-field-initializers is supported
19 dnl with the current $CXX $CXXFLAGS $CPPFLAGS. 19 dnl with the current $CXX $CXXFLAGS $CPPFLAGS.
20 AC_MSG_CHECKING([whether -Wno-missing-field-initializers is supported]) 20 AC_CACHE_CHECK([whether -Wno-missing-field-initializers is supported],
21 AC_CACHE_VAL([gl_cv_cxx_nomfi_supported], [ 21 [gl_cv_cxx_nomfi_supported],
22 gl_save_CXXFLAGS="$CXXFLAGS" 22 [gl_save_CXXFLAGS="$CXXFLAGS"
23 CXXFLAGS="$CXXFLAGS -W -Werror -Wno-missing-field-initializers" 23 CXXFLAGS="$CXXFLAGS -W -Werror -Wno-missing-field-initializers"
24 AC_COMPILE_IFELSE( 24 AC_COMPILE_IFELSE(
25 [AC_LANG_PROGRAM([[]], [[]])], 25 [AC_LANG_PROGRAM([[]], [[]])],
26 [gl_cv_cxx_nomfi_supported=yes], 26 [gl_cv_cxx_nomfi_supported=yes],
27 [gl_cv_cxx_nomfi_supported=no]) 27 [gl_cv_cxx_nomfi_supported=no])
28 CXXFLAGS="$gl_save_CXXFLAGS"]) 28 CXXFLAGS="$gl_save_CXXFLAGS"
29 AC_MSG_RESULT([$gl_cv_cxx_nomfi_supported]) 29 ])
30 30
31 if test "$gl_cv_cxx_nomfi_supported" = yes; then 31 if test "$gl_cv_cxx_nomfi_supported" = yes; then
32 dnl Now check whether -Wno-missing-field-initializers is needed 32 dnl Now check whether -Wno-missing-field-initializers is needed
33 dnl for the { 0, } construct. 33 dnl for the { 0, } construct.
34 AC_MSG_CHECKING([whether -Wno-missing-field-initializers is needed]) 34 AC_CACHE_CHECK([whether -Wno-missing-field-initializers is needed],
35 AC_CACHE_VAL([gl_cv_cxx_nomfi_needed], [ 35 [gl_cv_cxx_nomfi_needed],
36 gl_save_CXXFLAGS="$CXXFLAGS" 36 [gl_save_CXXFLAGS="$CXXFLAGS"
37 CXXFLAGS="$CXXFLAGS -W -Werror" 37 CXXFLAGS="$CXXFLAGS -W -Werror"
38 AC_COMPILE_IFELSE( 38 AC_COMPILE_IFELSE(
39 [AC_LANG_PROGRAM( 39 [AC_LANG_PROGRAM(
40 [[int f (void) 40 [[int f (void)
41 { 41 {
42 typedef struct { int a; int b; } s_t; 42 typedef struct { int a; int b; } s_t;
43 s_t s1 = { 0, }; 43 s_t s1 = { 0, };
44 return s1.b; 44 return s1.b;
45 } 45 }
46 ]], 46 ]],
47 [[]])], 47 [[]])],
48 [gl_cv_cxx_nomfi_needed=no], 48 [gl_cv_cxx_nomfi_needed=no],
49 [gl_cv_cxx_nomfi_needed=yes]) 49 [gl_cv_cxx_nomfi_needed=yes])
50 CXXFLAGS="$gl_save_CXXFLAGS" 50 CXXFLAGS="$gl_save_CXXFLAGS"
51 ]) 51 ])
52 AC_MSG_RESULT([$gl_cv_cxx_nomfi_needed])
53 fi 52 fi
54 53
55 dnl Next, check if -Werror -Wuninitialized is useful with the 54 dnl Next, check if -Werror -Wuninitialized is useful with the
56 dnl user's choice of $CXXFLAGS; some versions of gcc warn that it 55 dnl user's choice of $CXXFLAGS; some versions of gcc warn that it
57 dnl has no effect if -O is not also used 56 dnl has no effect if -O is not also used
58 AC_MSG_CHECKING([whether -Wuninitialized is supported]) 57 AC_CACHE_CHECK([whether -Wuninitialized is supported],
59 AC_CACHE_VAL([gl_cv_cxx_uninitialized_supported], [ 58 [gl_cv_cxx_uninitialized_supported],
60 gl_save_CXXFLAGS="$CXXFLAGS" 59 [gl_save_CXXFLAGS="$CXXFLAGS"
61 CXXFLAGS="$CXXFLAGS -Werror -Wuninitialized" 60 CXXFLAGS="$CXXFLAGS -Werror -Wuninitialized"
62 AC_COMPILE_IFELSE( 61 AC_COMPILE_IFELSE(
63 [AC_LANG_PROGRAM([[]], [[]])], 62 [AC_LANG_PROGRAM([[]], [[]])],
64 [gl_cv_cxx_uninitialized_supported=yes], 63 [gl_cv_cxx_uninitialized_supported=yes],
65 [gl_cv_cxx_uninitialized_supported=no]) 64 [gl_cv_cxx_uninitialized_supported=no])
66 CXXFLAGS="$gl_save_CXXFLAGS"]) 65 CXXFLAGS="$gl_save_CXXFLAGS"
67 AC_MSG_RESULT([$gl_cv_cxx_uninitialized_supported]) 66 ])
68 67
69 fi 68 fi
70 69
71 # List all gcc warning categories. 70 # List all gcc warning categories.
72 # To compare this list to your installed GCC's, run this Bash command: 71 # To compare this list to your installed GCC's, run this Bash command: