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These autoconf macros permit to enable a particular
compiler option in a portable way, testing if
the particular compiler version support it and
ignoring the option if it is not supported.

These are derived from gnulib warnings.m4 macro,
but do the check in a little different way.

Signed-off-by: Elia Pinto <gitter.spiros@gmail.com>
---
configure.in | 13 ++++++++++++-
m4/acinclude.m4 | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 64 insertions(+), 1 deletions(-)

diff --git a/configure.in b/configure.in
index 9ea805c..0cf03da 100644
--- a/configure.in
+++ b/configure.in
@@ -1568,9 +1568,20 @@ WERR_CFLAGS=
WERR_CFLAGS_MILTER=
if test "x$enable_distcheckwerror" = "xyes"; then
if test "$distcheck_enable_flags" = "1"; then
- WERR_COMMON="-Wno-pointer-sign -Werror-implicit-function-declaration -Werror -Wextra -Wall -Wno-error=bad-function-cast -Wbad-function-cast -Wcast-align -Wendif-labels -Wfloat-equal -Wformat=2 -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wno-error=missing-prototypes -Wnested-externs -Wno-error=nested-externs -Wpointer-arith -Wstrict-prototypes -Wno-error=strict-prototypes -Wno-switch -Wno-switch-enum -Wundef -Wstrict-overflow=1 -Winit-self -Wmissing-include-dirs -Wstrict-aliasing -Wdeclaration-after-statement -Waggregate-return -Wmissing-format-attribute -Wno-error=missing-format-attribute -Wno-error=type-limits -Wno-error=unused-but-set-variable -Wno-error=unused-function -Wno-error=unused-value -Wno-error=unused-variable -Wcast-qual -Wno-error=cast-qual -Wno-error=sign-compare -Wshadow -Wno-error=shadow -Wno-error=uninitialized -fdiagnostics-show-option -Wno-unused-parameter -Wno-error=unreachable-code -Winvalid-pch -Wno-error=invalid-pch -O2 -D_FORTIFY_
SOURCE=2 -fstack-protector-all -Wstack-protector -Wno-error=aggregate-return"
+ WERR_COMMON="-Wno-pointer-sign -Werror-implicit-function-declaration -Werror -Wextra -Wall -Wno-error=bad-function-cast -Wbad-function-cast -Wcast-align -Wendif-labels -Wfloat-equal -Wformat=2 -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wno-error=missing-prototypes -Wnested-externs -Wno-error=nested-externs -Wpointer-arith -Wstrict-prototypes -Wno-error=strict-prototypes -Wno-switch -Wno-switch-enum -Wundef -Wstrict-overflow=1 -Winit-self -Wmissing-include-dirs -Wstrict-aliasing \
+-Wdeclaration-after-statement -Waggregate-return -Wmissing-format-attribute -Wno-error=missing-format-attribute -Wno-error=type-limits -Wno-error=unused-but-set-variable -Wno-error=unused-function -Wno-error=unused-value -Wno-error=unused-variable -Wcast-qual -Wno-error=cast-qual -Wno-error=sign-compare -Wshadow -Wno-error=shadow -Wno-error=uninitialized -fdiagnostics-show-option -Wno-unused-parameter -Wno-error=unreachable-code -Winvalid-pch -Wno-error=invalid-pch -O2 -D_FORTIFY_SOURCE=2 -fstack-protector-all -Wstack-protector -Wno-error=aggregate-return"
WERR_CFLAGS="$WERR_COMMON -Wwrite-strings"
+ for c in $WERR_CFLAGS
+ do
+ cl_CFLAGS_ADD([$c], [CL_CFLAGS])
+ done
WERR_CFLAGS_MILTER="$WERR_COMMON -Wno-error=format-nonliteral"
+ for c in $WERR_CFLAGS_MILTER
+ do
+ cl_CFLAGS_ADD([$c], [CL_CFLAGS_MILTER])
+ done
+ WERR_CFLAGS="$CL_CFLAGS"
+ WERR_CFLAGS_MILTER="$CL_CFLAGS_MILTER"
fi
fi
AC_SUBST([WERR_CFLAGS])
diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
index 981c634..df08d3e 100644
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
@@ -886,3 +886,55 @@ AC_DEFUN([CL_MSG_STATUS],
[test "x$3" = "x"], [AS_ECHO(["$2"])],
[AS_ECHO(["$2 ($3)"])])
])
+
+
+
+# cl_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], [cl_AS_VAR_APPEND])],
+[m4_define([cl_AS_VAR_APPEND],
+[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
+
+# cl_CFLAGS_ADD(PARAMETER, [VARIABLE = CL_CFLAGS])
+# ------------------------------------------------
+# Adds parameter to CL_CFLAGS if the compiler supports it. For example,
+# cl_CFLAGS_ADD([-Wall],[CL_CFLAGS]).
+AC_DEFUN([cl_CFLAGS_ADD],
+[AS_VAR_PUSHDEF([cl_my_cflags], [cl_cv_warn_$1])dnl
+AC_CACHE_CHECK([whether compiler handles $1], [cl_my_cflags], [
+ save_CFLAGS="$CFLAGS"
+ CFLAGS="${CFLAGS} $1"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+ [AS_VAR_SET([cl_my_cflags], [yes])],
+ [AS_VAR_SET([cl_my_cflags], [no])])
+ CFLAGS="$save_CFLAGS"
+])
+AS_VAR_PUSHDEF([cl_cflags], m4_if([$2], [], [[CL_CFLAGS]], [[$2]]))dnl
+AS_VAR_IF([cl_my_cflags], [yes], [cl_AS_VAR_APPEND([cl_cflags], [" $1"])])
+AS_VAR_POPDEF([cl_cflags])dnl
+AS_VAR_POPDEF([cl_my_cflags])dnl
+m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl
+])
+
+# cl_LDFLAGS_ADD(PARAMETER, [VARIABLE = CL_LDFLAGS])
+# ------------------------------------------------
+# Adds parameter to CL_LDFLAGS if the compiler supports it. For example,
+# cl_LDFLAGS_ADD([-Wall],[CL_LDFLAGS]).
+AC_DEFUN([cl_LDFLAGS_ADD],
+[AS_VAR_PUSHDEF([cl_my_ldflags], [cl_cv_warn_$1])dnl
+AC_CACHE_CHECK([whether compiler handles $1], [cl_my_ldflags], [
+ save_LDFLAGS="$LDFLAGS"
+ LDFLAGS="${LDFLAGS} $1"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+ [AS_VAR_SET([cl_my_ldflags], [yes])],
+ [AS_VAR_SET([cl_my_ldflags], [no])])
+ LDFLAGS="$save_LDFLAGS"
+])
+AS_VAR_PUSHDEF([cl_ldflags], m4_if([$2], [], [[CL_LDFLAGS]], [[$2]]))dnl
+AS_VAR_IF([cl_my_ldflags], [yes], [cl_AS_VAR_APPEND([cl_ldflags], [" $1"])])
+AS_VAR_POPDEF([cl_ldflags])dnl
+AS_VAR_POPDEF([cl_my_ldflags])dnl
+m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl
+])
--
1.7.8.rc3.31.g017d1

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