diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/attributes.m4 | 59 |
1 files changed, 56 insertions, 3 deletions
diff --git a/m4/attributes.m4 b/m4/attributes.m4 index 65f83788..28fac277 100644 --- a/m4/attributes.m4 +++ b/m4/attributes.m4 @@ -1,6 +1,6 @@ dnl Macros to check the presence of generic (non-typed) symbols. -dnl Copyright (c) 2006-2007 Diego Pettenò <flameeyes@gmail.com> -dnl Copyright (c) 2006-2007 xine project +dnl Copyright (c) 2006-2008 Diego Pettenò <flameeyes@gmail.com> +dnl Copyright (c) 2006-2008 xine project dnl dnl This program is free software; you can redistribute it and/or modify dnl it under the terms of the GNU General Public License as published by @@ -32,6 +32,9 @@ dnl distribute a modified version of the Autoconf Macro, you may extend dnl this special exception to the GPL to apply to your modified version as dnl well. +dnl Check if the flag is supported by compiler +dnl CC_CHECK_CFLAGS_SILENT([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND]) + AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [ AC_CACHE_VAL(AS_TR_SH([cc_cv_cflags_$1]), [ac_save_CFLAGS="$CFLAGS" @@ -46,6 +49,9 @@ AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [ [$2], [$3]) ]) +dnl Check if the flag is supported by compiler (cacheable) +dnl CC_CHECK_CFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND]) + AC_DEFUN([CC_CHECK_CFLAGS], [ AC_CACHE_CHECK([if $CC supports $1 flag], AS_TR_SH([cc_cv_cflags_$1]), @@ -56,6 +62,28 @@ AC_DEFUN([CC_CHECK_CFLAGS], [ [$2], [$3]) ]) +dnl CC_CHECK_CFLAG_APPEND(FLAG, [action-if-found], [action-if-not-found]) +dnl Check for CFLAG and appends them to CFLAGS if supported +AC_DEFUN([CC_CHECK_CFLAG_APPEND], [ + AC_CACHE_CHECK([if $CC supports $1 flag], + AS_TR_SH([cc_cv_cflags_$1]), + CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here! + ) + + AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes], + [CFLAGS="$CFLAGS $1"; DEBUG_CFLAGS="$DEBUG_CFLAGS $1"; $2], [$3]) +]) + +dnl CC_CHECK_CFLAGS_APPEND([FLAG1 FLAG2], [action-if-found], [action-if-not]) +AC_DEFUN([CC_CHECK_CFLAGS_APPEND], [ + for flag in $1; do + CC_CHECK_CFLAG_APPEND($flag, [$2], [$3]) + done +]) + +dnl Check if the flag is supported by linker (cacheable) +dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND]) + AC_DEFUN([CC_CHECK_LDFLAGS], [ AC_CACHE_CHECK([if $CC supports $1 flag], AS_TR_SH([cc_cv_ldflags_$1]), @@ -63,7 +91,7 @@ AC_DEFUN([CC_CHECK_LDFLAGS], [ LDFLAGS="$LDFLAGS $1" AC_LINK_IFELSE([int main() { return 1; }], [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"], - [eval "AS_TR_SH([cc_cv_ldflags_$1])='no'"]) + [eval "AS_TR_SH([cc_cv_ldflags_$1])="]) LDFLAGS="$ac_save_LDFLAGS" ]) @@ -71,6 +99,31 @@ AC_DEFUN([CC_CHECK_LDFLAGS], [ [$2], [$3]) ]) +dnl define the LDFLAGS_NOUNDEFINED variable with the correct value for +dnl the current linker to avoid undefined references in a shared object. +AC_DEFUN([CC_NOUNDEFINED], [ + dnl We check $host for which systems to enable this for. + AC_REQUIRE([AC_CANONICAL_HOST]) + + case $host in + dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads + dnl are requested, as different implementations are present; to avoid problems + dnl use -Wl,-z,defs only for those platform not behaving this way. + *-freebsd* | *-openbsd*) ;; + *) + dnl First of all check for the --no-undefined variant of GNU ld. This allows + dnl for a much more readable commandline, so that people can understand what + dnl it does without going to look for what the heck -z defs does. + for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do + CC_CHECK_LDFLAGS([$possible_flags], [LDFLAGS_NOUNDEFINED="$possible_flags"]) + break + done + ;; + esac + + AC_SUBST([LDFLAGS_NOUNDEFINED]) +]) + dnl Check for a -Werror flag or equivalent. -Werror is the GCC dnl and ICC flag that tells the compiler to treat all the warnings dnl as fatal. We usually need this option to make sure that some |