1dnl A version of AS_COMPILER_FLAG that supports linker flags 2dnl Based on: 3 4dnl as-compiler-flag.m4 0.1.0 5dnl autostars m4 macro for detection of compiler flags 6dnl David Schleef <ds@schleef.org> 7dnl $Id: as-compiler-flag.m4,v 1.1 2005/06/18 18:02:46 burgerman Exp $ 8 9dnl TP_LINKER_FLAG(LDFLAGS, ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED]) 10dnl Tries to compile with the given LDFLAGS. 11dnl 12dnl Runs ACTION-IF-ACCEPTED if the compiler/linker for the currently selected 13dnl AC_LANG can compile with the flags, and ACTION-IF-NOT-ACCEPTED otherwise. 14dnl 15dnl Note that LDFLAGS are passed to the linker via the compiler, so you 16dnl should check for -Wl,--no-add-needed rather than --no-add-needed. 17 18AC_DEFUN([TP_LINKER_FLAG], 19[ 20 AC_MSG_CHECKING([to see if compiler/linker understand $1]) 21 22 save_LDFLAGS="$LDFLAGS" 23 LDFLAGS="$LDFLAGS $1" 24 25 AC_COMPILE_IFELSE(AC_LANG_SOURCE([]), [flag_ok=yes], [flag_ok=no]) 26 27 LDFLAGS="$save_LDFLAGS" 28 29 if test "X$flag_ok" = Xyes ; then 30 $2 31 true 32 else 33 $3 34 true 35 fi 36 AC_MSG_RESULT([$flag_ok]) 37]) 38 39dnl TP_ADD_LINKER_FLAG(VARIABLE, LDFLAGS) 40dnl Append LDFLAGS to VARIABLE if the linker supports them. 41AC_DEFUN([TP_ADD_LINKER_FLAG], 42[ 43 TP_LINKER_FLAG([$2], [$1="[$]$1 $2"]) 44]) 45