14
14
[m4_define([gl_AS_VAR_APPEND],
15
15
[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
17
# gl_WARN_ADD(PARAMETER, [VARIABLE = WARN_CFLAGS])
18
# ------------------------------------------------
19
# Adds parameter to WARN_CFLAGS if the compiler supports it. For example,
20
# gl_WARN_ADD([-Wparentheses]).
18
# gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED],
19
# [PROGRAM = AC_LANG_PROGRAM()])
20
# -----------------------------------------------------------------
21
# Check if the compiler supports OPTION when compiling PROGRAM.
23
# FIXME: gl_Warn must be used unquoted until we can assume Autoconf
25
AC_DEFUN([gl_COMPILER_OPTION_IF],
26
[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
27
AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
29
[m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))],
32
-Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;;
34
m4_pushdef([gl_Positive], [$gl_positive])])dnl
35
AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
36
gl_save_compiler_FLAGS="$gl_Flags"
37
gl_AS_VAR_APPEND(m4_defn([gl_Flags]),
38
[" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["])
39
AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
40
[AS_VAR_SET(gl_Warn, [yes])],
41
[AS_VAR_SET(gl_Warn, [no])])
42
gl_Flags="$gl_save_compiler_FLAGS"
44
AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
45
m4_popdef([gl_Positive])dnl
46
AS_VAR_POPDEF([gl_Flags])dnl
47
AS_VAR_POPDEF([gl_Warn])dnl
50
# gl_UNKNOWN_WARNINGS_ARE_ERRORS
51
# ------------------------------
52
# Clang doesn't complain about unknown warning options unless one also
53
# specifies -Wunknown-warning-option -Werror. Detect this.
54
AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS],
55
[gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option],
56
[gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'],
57
[gl_unknown_warnings_are_errors=])])
59
# gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS],
60
# [PROGRAM = AC_LANG_PROGRAM()])
61
# ---------------------------------------------
62
# Adds parameter to WARN_CFLAGS if the compiler supports it when
63
# compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]).
65
# If VARIABLE is a variable name, AC_SUBST it.
21
66
AC_DEFUN([gl_WARN_ADD],
22
dnl FIXME: gl_Warn must be used unquoted until we can assume
23
dnl autoconf 2.64 or newer.
24
[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_$1])dnl
25
AC_CACHE_CHECK([whether compiler handles $1], m4_defn([gl_Warn]), [
26
gl_save_CPPFLAGS="$CPPFLAGS"
27
CPPFLAGS="${CPPFLAGS} $1"
28
AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])],
29
[AS_VAR_SET(gl_Warn, [yes])],
30
[AS_VAR_SET(gl_Warn, [no])])
31
CPPFLAGS="$gl_save_CPPFLAGS"
33
AS_VAR_IF(gl_Warn, [yes],
34
[gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])])
35
AS_VAR_POPDEF([gl_Warn])dnl
36
m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl
67
[AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS])
68
gl_COMPILER_OPTION_IF([$1],
69
[gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])],
73
[AS_LITERAL_IF([$2], [AC_SUBST([$2])])],
74
[AC_SUBST([WARN_CFLAGS])])dnl
added
removed
gl/m4/warnings.m4
