external/cde
1
0
Fork 0
mirror of git://git.code.sf.net/p/cdesktopenv/code synced 2025-03-09 15:50:02 +00:00
Code Issues Releases Wiki Activity

configure.ac: add m4 macros that can check for compiler option support

Browse source 
We now use this to set certain options, if supported by the compilers
(C/C++).  Currently we enable various options, like
-Wno-format-truncation.  We use this to ignore complaints about
possibly truncations due to the use of the snprintf() family of
functions - where forced truncation is the whole point.
This commit is contained in:
Jon Trulson 2021-11-16 12:27:45 -07:00
parent 4b3901f63b
commit 3021e01559
2 changed files with 54 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

16
cde/configure.ac
View file

@ -77,8 +77,6 @@ case "${host_os}" in
OSMINORVERSION=15
SOURCE_CPP_DEFINES="${SOURCE_CPP_DEFINES} -D_POSIX_SOURCE \
-D_DEFAULT_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE"
CPP_COMPILER_FLAGS="-fno-strict-aliasing -Wno-write-strings \
-Wno-unused-result"
;;
freebsd*)
build_freebsd=yes
@ -306,6 +304,20 @@ AC_PROG_CC_C99
AC_PATH_X
AC_PATH_XTRA
dnl check some compiler flags
C_FLAG_CHECK([-Wno-format-truncation])
CXX_FLAG_CHECK([-Wno-format-truncation])
C_FLAG_CHECK([-fno-strict-aliasing])
CXX_FLAG_CHECK([-fno-strict-aliasing])
C_FLAG_CHECK([-Wno-write-strings])
CXX_FLAG_CHECK([-Wno-write-strings])
C_FLAG_CHECK([-Wno-unused-result])
CXX_FLAG_CHECK([-Wno-unused-result])
dnl Add X11 goodies here
EXTRA_LIBS="${X_LIBS} ${EXTRA_LIBS}"
EXTRA_INCS="${X_CFLAGS} ${EXTRA_INCS}"

40
cde/m4/compiler_flag_chk.m4 Normal file
View file

@ -0,0 +1,40 @@
dnl From stackoverflow, with some changes
dnl @synopsis CXX_FLAGS_CHECK [compiler flags]
dnl @summary check whether compiler supports given C++ flags or not
AC_DEFUN([CXX_FLAG_CHECK],
[dnl
AC_MSG_CHECKING([if $CXX supports $1])
AC_LANG_PUSH([C++])
ac_saved_cxxflags="$CXX_COMPILER_FLAGS"
CXX_COMPILER_FLAGS="-Werror $1"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
[cxx_flag_check=yes],
[cxx_flag_check=no]
)
AC_MSG_RESULT([$cxx_flag_check])
CXX_COMPILER_FLAGS="$ac_saved_cxxflags"
if test "$cxx_flag_check" = yes
then
CXX_COMPILER_FLAGS="$CXX_COMPILER_FLAGS $1"
fi
AC_LANG_POP([C++])
])
AC_DEFUN([C_FLAG_CHECK],
[dnl
AC_MSG_CHECKING([if $CC supports $1])
AC_LANG_PUSH([C])
ac_saved_ccflags="$C_COMPILER_FLAGS"
C_COMPILER_FLAGS="-Werror $1"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
[cc_flag_check=yes],
[cc_flag_check=no]
)
AC_MSG_RESULT([$cc_flag_check])
C_COMPILER_FLAGS="$ac_saved_ccflags"
if test "$cc_flag_check" = yes
then
C_COMPILER_FLAGS="$C_COMPILER_FLAGS $1"
fi
AC_LANG_POP([C])
])