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94 lines
3.0 KiB
94 lines
3.0 KiB
dnl The CLN manual says that without CFLAGS or CXXFLAGS being set compilation
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dnl will happen with -O. However, AC_PROG_CC and AC_PROG_CXX set CFLAGS and
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dnl CXXFLAGS to "-g -O2", which produces way too large binaries.
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dnl Wrapper around AC_PROG_CC setting CFLAGS to plain "-O" as opposed to
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dnl "-g -O2" for the GNU compiler (unless CFLAGS was set before).
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AC_DEFUN([CL_PROG_CC],
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[cl_test_CFLAGS=${CFLAGS+set}
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# Make sure this macro does not come after AC_PROG_CC.
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# Otherwise CFLAGS would already be set.
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AC_BEFORE([$0],[AC_PROG_CC])dnl
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AC_PROG_CC([$1])
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if test "$cl_test_CFLAGS" != set && test "$ac_compiler_gnu" = yes; then
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CFLAGS="-O"
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fi
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])
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dnl Wrapper around AC_PROG_CXX setting CXXFLAGS to plain "-O" as opposed to
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dnl "-g -O2" for the GNU compiler (unless CXXFLAGS was set before). Also
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dnl emits a warning if G++ is used and optimization turned off.
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AC_DEFUN([CL_PROG_CXX],
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[cl_test_CXXFLAGS=${CXXFLAGS+set}
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# Make sure this macro does not come after AC_PROG_CXX.
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# Otherwise CXXFLAGS would already be set.
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AC_BEFORE([$0],[AC_PROG_CXX])dnl
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AC_PROG_CXX([$1])
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if test "$ac_compiler_gnu" = yes; then
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if test "$cl_test_CXXFLAGS" != set; then
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# User has not set CXXFLAGS.
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CXXFLAGS="-O"
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else
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# Warn if optimization has been turned off with GCC.
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# Optimization is used for module ordering.
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case $CXXFLAGS in
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[ *\ -O | -O | -O\ * | *\ -O\ * | -O[!0]* | *\ -O[!0]*) ;; ]
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*) AC_MSG_WARN([Optimization turned off. I recommend you unset CXXFLAGS.]);;
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esac
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fi
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fi
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])
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dnl Checks whether the stack can be marked nonexecutable by passing an option
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dnl to the C-compiler when acting on .s files. Appends that option to ASFLAGS.
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dnl This macro is adapted from one found in GLIBC-2.3.5.
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AC_DEFUN([CL_AS_NOEXECSTACK],[
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AC_REQUIRE([AC_PROG_CC])
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AC_CACHE_CHECK([whether --noexecstack is desirable for .s files], cl_cv_as_noexecstack, [dnl
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cat > conftest.c <<EOF
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void foo() {}
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EOF
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if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS
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-S -o conftest.s conftest.c >/dev/null]) \
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&& grep -q .note.GNU-stack conftest.s \
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&& AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS -Wa,--noexecstack
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-c -o conftest.o conftest.s >/dev/null])
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then
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cl_cv_as_noexecstack=yes
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else
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cl_cv_as_noexecstack=no
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fi
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rm -f conftest*])
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if test "$cl_cv_as_noexecstack" = yes; then
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ASMFLAGS="$ASMFLAGS -Wa,--noexecstack"
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fi
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AC_SUBST(ASMFLAGS)
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])
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dnl Checks whether the compiler supports __attribute__((flatten)).
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AC_DEFUN([CL_ATTRIBUTE_FLATTEN],[
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AC_REQUIRE([AC_PROG_CXX])
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AC_CACHE_CHECK([whether the compiler supports __attribute__((flatten))], cl_cv_have_attr_flatten, [dnl
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cat > conftest.cc <<EOF
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void f() __attribute__((flatten));
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EOF
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if AC_TRY_COMMAND(${CXX-g++} $CXXFLAGS -c conftest.cc >/dev/null 2>conftest.stderr)
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then
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if grep -i "warning" conftest.stderr > /dev/null; then
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cl_cv_have_attr_flatten=no
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else
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cl_cv_have_attr_flatten=yes
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fi
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else
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cl_cv_have_attr_flatten=no
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fi
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rm -f conftest*
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])
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if test $cl_cv_have_attr_flatten = yes; then
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AC_DEFINE(CL_HAVE_ATTRIBUTE_FLATTEN)
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fi
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])
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