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authorSimon McVittie <simon.mcvittie@collabora.co.uk>2011-05-09 18:32:51 +0100
committerSimon McVittie <simon.mcvittie@collabora.co.uk>2011-05-25 16:56:45 +0100
commitad4e7af759d7e86a79508525949b6fabef53753f (patch)
tree5a69a89549a9a840882ca47e7d1a586aaabd7957 /m4
parent4a6c68c0ffafbc85bdf7d49688cb7afb114541d5 (diff)
Import tp-compiler-flag.m4 and tp-compiler-warnings.m4 from telepathy-glib
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=19681 Reviewed-by: Colin Walters <walters@verbum.org>
Diffstat (limited to 'm4')
-rw-r--r--m4/tp-compiler-flag.m443
-rw-r--r--m4/tp-compiler-warnings.m449
2 files changed, 92 insertions, 0 deletions
diff --git a/m4/tp-compiler-flag.m4 b/m4/tp-compiler-flag.m4
new file mode 100644
index 00000000..06deaba0
--- /dev/null
+++ b/m4/tp-compiler-flag.m4
@@ -0,0 +1,43 @@
+dnl A version of AS_COMPILER_FLAG that supports both C and C++.
+dnl Based on:
+
+dnl as-compiler-flag.m4 0.1.0
+dnl autostars m4 macro for detection of compiler flags
+dnl David Schleef <ds@schleef.org>
+dnl $Id: as-compiler-flag.m4,v 1.1 2005/06/18 18:02:46 burgerman Exp $
+
+dnl TP_COMPILER_FLAG(CFLAGS, ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED])
+dnl Tries to compile with the given CFLAGS and CXXFLAGS.
+dnl
+dnl Runs ACTION-IF-ACCEPTED if the compiler for the currently selected
+dnl AC_LANG can compile with the flags, and ACTION-IF-NOT-ACCEPTED otherwise.
+
+AC_DEFUN([TP_COMPILER_FLAG],
+[
+ AC_MSG_CHECKING([to see if compiler understands $1])
+
+ save_CFLAGS="$CFLAGS"
+ save_CXXFLAGS="$CXXFLAGS"
+ CFLAGS="$CFLAGS $1"
+ CXXFLAGS="$CXXFLAGS $1"
+
+ AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no])
+ CFLAGS="$save_CFLAGS"
+ CXXFLAGS="$save_CXXFLAGS"
+
+ if test "X$flag_ok" = Xyes ; then
+ $2
+ true
+ else
+ $3
+ true
+ fi
+ AC_MSG_RESULT([$flag_ok])
+])
+
+dnl TP_ADD_COMPILER_FLAG(VARIABLE, CFLAGS)
+dnl Append CFLAGS to VARIABLE if the compiler supports them.
+AC_DEFUN([TP_ADD_COMPILER_FLAG],
+[
+ TP_COMPILER_FLAG([$2], [$1="[$]$1 $2"])
+])
diff --git a/m4/tp-compiler-warnings.m4 b/m4/tp-compiler-warnings.m4
new file mode 100644
index 00000000..ee4af310
--- /dev/null
+++ b/m4/tp-compiler-warnings.m4
@@ -0,0 +1,49 @@
+dnl TP_COMPILER_WARNINGS(VARIABLE, WERROR_BY_DEFAULT, DESIRABLE, UNDESIRABLE)
+dnl $1 (VARIABLE): the variable to put flags into
+dnl $2 (WERROR_BY_DEFAULT): a command returning true if -Werror should be the
+dnl default
+dnl $3 (DESIRABLE): warning flags we want (e.g. all extra shadow)
+dnl $4 (UNDESIRABLE): warning flags we don't want (e.g.
+dnl missing-field-initializers unused-parameter)
+AC_DEFUN([TP_COMPILER_WARNINGS],
+[
+ AC_REQUIRE([AC_ARG_ENABLE])dnl
+ AC_REQUIRE([AC_HELP_STRING])dnl
+ AC_REQUIRE([TP_COMPILER_FLAG])dnl
+
+ tp_warnings=""
+ for tp_flag in $3; do
+ TP_COMPILER_FLAG([-W$tp_flag], [tp_warnings="$tp_warnings -W$tp_flag"])
+ done
+
+ tp_error_flags="-Werror"
+ TP_COMPILER_FLAG([-Werror], [tp_werror=yes], [tp_werror=no])
+
+ for tp_flag in $4; do
+ TP_COMPILER_FLAG([-Wno-$tp_flag],
+ [tp_warnings="$tp_warnings -Wno-$tp_flag"])
+dnl Yes, we do need to use both -Wno-foo and -Wno-error=foo. Simon says:
+dnl some warnings we explicitly don't want, like unused-parameter, but
+dnl they're in -Wall. when a distro using cdbs compiles us, we have:
+dnl -Werror -Wno-unused-parameter -Wall
+dnl ^ from us ^ from cdbs
+dnl which turns -Wunused-parameter back on, in effect
+ TP_COMPILER_FLAG([-Wno-error=$tp_flag],
+ [tp_error_flags="$tp_error_flags -Wno-error=$tp_flag"], [tp_werror=no])
+ done
+
+ AC_ARG_ENABLE([Werror],
+ AC_HELP_STRING([--disable-Werror],
+ [compile without -Werror (normally enabled in development builds)]),
+ tp_werror=$enableval, :)
+
+ if test "x$tp_werror" = xyes && $2; then
+dnl We put -Wno-error=foo before -Wno-foo because clang interprets -Wall
+dnl -Werror -Wno-foo -Wno-error=foo as “make foo a non-fatal warning”, but does
+dnl what we want if you reverse them.
+ $1="$tp_error_flags $tp_warnings"
+ else
+ $1="$tp_warnings"
+ fi
+
+])