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Use m4 macro AC_TRY_CCFLAG to detect presence of some compiler option. Use it to detect -Wjump-misses-init.
40 lines
1.1 KiB
Plaintext
40 lines
1.1 KiB
Plaintext
dnl AC_GCC_VERSION
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dnl check for compiler version
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dnl sets COMPILER_VERSION and GCC_VERSION
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AC_DEFUN([AC_CC_VERSION],
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[
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AC_MSG_CHECKING([C compiler version])
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COMPILER_VERSION=`$CC -v 2>&1 | grep version`
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case "$COMPILER_VERSION" in
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*gcc*)
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dnl Ok, how to turn $3 into the real $3
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GCC_VERSION=`echo $COMPILER_VERSION | \
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sed -e 's/[[^ ]]*\ [[^ ]]*\ \([[^ ]]*\)\ .*/\1/'` ;;
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*) GCC_VERSION=unknown ;;
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esac
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AC_MSG_RESULT($GCC_VERSION)
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])
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dnl AC_TRY_CCFLAG([CCFLAG], [VAR], [ACTION-IF-WORKS], [ACTION-IF-FAILS])
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dnl check if $CC supports a given flag
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AC_DEFUN([AC_TRY_CCFLAG],
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[
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AC_REQUIRE([AC_PROG_CC])
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ac_save_CFLAGS=$CFLAGS
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CFLAGS=$1
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AC_MSG_RESULT([KOUKEJ $name])
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AC_CACHE_CHECK([whether $CC accepts $1 flag], [ac_cv_flag_$2],
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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[AS_VAR_SET([ac_cv_flag_$2], [yes])],
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[AS_VAR_SET([ac_cv_flag_$2], [no])])])
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CFLAGS=$ac_save_CFLAGS
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$2=AS_VAR_GET([ac_cv_flag_$2])
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if test "$2" = yes; then
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ifelse([$3], [], [:], [$3])
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else
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ifelse([$4], [], [:], [$4])
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fi
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])
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