# $Id$ # Public macros for the TeX Live (TL) tree. # Copyright 2017-2018 Karl Berry # Copyright 2013-2014 Peter Breitenlohner # # This file is free software; the copyright holder # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # KPSE_COMPILER_VISIBILITY # ------------------------ # Set up compiler flags for C and C++ to hide external symbols. # This macro determines and substitutes VISIBILITY_CFLAGS for the C compiler # and, if applicable, VISIBILITY_CXXFLAGS for the C++ compiler. To activate # them a Makefile.am must use them, e.g., in AM_CFLAGS or AM_CXXFLAGS. AC_DEFUN([KPSE_COMPILER_VISIBILITY], [dnl arrange that AC_PROG_CC uses _KPSE_VISIBILITY_CFLAGS etc. echo 'tldbg:[$0] called.' >&AS_MESSAGE_LOG_FD AC_PROVIDE_IFELSE([AC_PROG_CC], [_KPSE_VISIBILITY_CFLAGS], [m4_define([AC_PROG_CC], m4_defn([AC_PROG_CC])[_KPSE_VISIBILITY_CFLAGS ])]) AC_PROVIDE_IFELSE([AC_PROG_CXX], [_KPSE_VISIBILITY_CXXFLAGS], [m4_define([AC_PROG_CXX], m4_defn([AC_PROG_CXX])[_KPSE_VISIBILITY_CXXFLAGS ])]) ]) # KPSE_COMPILER_VISIBILITY _KPSE_VISIBILITY_CFLAGS # --------------------- # Internal subroutine. # Set up compiler flags for C to hide external symbols. AC_DEFUN([_KPSE_VISIBILITY_CFLAGS], [dnl AC_REQUIRE([AC_PROG_CC])[]dnl _KPSE_VISIBILITY_FLAGS([C], [cflags]) m4_define([_KPSE_VISIBILITY_CFLAGS], [])[]dnl ]) # _KPSE_VISIBILITY_CFLAGS _KPSE_VISIBILITY_CXXFLAGS # ----------------------- # Internal subroutine. # Set up compiler flags for C++ to hide external symbols. AC_DEFUN([_KPSE_VISIBILITY_CXXFLAGS], [dnl AC_REQUIRE([AC_PROG_CXX])[]dnl _KPSE_VISIBILITY_FLAGS([C++], [cxxflags]) m4_define([_KPSE_VISIBILITY_CXXFLAGS], [])[]dnl ]) # _KPSE_VISIBILITY_CFLAGS _KPSE_VISIBILITY_FLAGS(LANG, TAG) # ------------------------------- # Internal subroutine. # Set up compiler flags for C or C++ to hide external symbols. m4_define([_KPSE_VISIBILITY_FLAGS], [dnl AC_CACHE_CHECK(AS_TR_CPP($2) [for $1 to hide external symbols], [kpse_cv_visibility_$2], [dnl AC_LANG_PUSH([$1]) kpse_cv_visibility_$2=unknown kpse_save_flags=$AS_TR_CPP($2) AC_LANG_CONFTEST([AC_LANG_SOURCE([[#include extern void foo(void); void foo(void){printf("foo\n");}]])]) # FIXME: Add tests for non-GNU compilers for kpse_flag in '-fvisibility=hidden -fvisibility-inlines-hidden' '-fvisibility=hidden'; do AS_TR_CPP($2)="$kpse_save_flags -Werror $kpse_flag" AC_COMPILE_IFELSE([], [kpse_cv_visibility_$2=$kpse_flag; break]) done AS_TR_CPP($2)=$kpse_save_flags AC_LANG_POP([$1]) ]) AS_CASE([$kpse_cv_visibility_$2], [unknown], [], [AC_SUBST([VISIBILITY_]AS_TR_CPP($2), [$kpse_cv_visibility_$2])]) ]) # _KPSE_VISIBILITY_FLAGS