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build: Use more compiler warnings

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* configure.ac: Add useful compiler warnings.
--

It is strange that this seems to be the only GnuPG package which does
not use modern warning.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2016-09-13 20:41:16 +02:00
parent 00c501d296
commit 0510591c36
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GPG Key ID: E3FDFF218E45B72B
1 changed files with 29 additions and 0 deletions
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29
configure.ac
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@ -512,6 +512,35 @@ AM_SUBST_NOTMAKE(API__SSIZE_T)
# Checks for compiler features.
if test "$GCC" = yes; then
CFLAGS="$CFLAGS -Wall -Wcast-align -Wshadow -Wstrict-prototypes"
if test "$USE_MAINTAINER_MODE" = "yes"; then
CFLAGS="$CFLAGS -Wformat -Wno-format-y2k -Wformat-security"
# If -Wno-missing-field-initializers is supported we can enable a
# a bunch of really useful warnings.
AC_MSG_CHECKING([if gcc supports -Wno-missing-field-initializers])
_gcc_cflags_save=$CFLAGS
CFLAGS="-Wno-missing-field-initializers"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
AC_MSG_RESULT($_gcc_wopt)
CFLAGS=$_gcc_cflags_save;
if test x"$_gcc_wopt" = xyes ; then
CFLAGS="$CFLAGS -W -Wextra -Wbad-function-cast"
CFLAGS="$CFLAGS -Wwrite-strings"
CFLAGS="$CFLAGS -Wdeclaration-after-statement"
CFLAGS="$CFLAGS -Wno-missing-field-initializers"
CFLAGS="$CFLAGS -Wno-sign-compare"
fi
AC_MSG_CHECKING([if gcc supports -Wpointer-arith])
_gcc_cflags_save=$CFLAGS
CFLAGS="-Wpointer-arith"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
AC_MSG_RESULT($_gcc_wopt)
CFLAGS=$_gcc_cflags_save;
if test x"$_gcc_wopt" = xyes ; then
CFLAGS="$CFLAGS -Wpointer-arith"
fi
fi
if test "$have_w32_system" = yes; then
CFLAGS="$CFLAGS -mms-bitfields"
fi