diff options
| author | Zdenek Kabelac <zkabelac@redhat.com> | 2013-10-24 21:40:25 +0200 |
|---|---|---|
| committer | Zdenek Kabelac <zkabelac@redhat.com> | 2013-10-25 00:41:36 +0200 |
| commit | d95751cb0b750ea698d665bd8ad8086fe9ee6945 (patch) | |
| tree | 6121ab50968f1fda9a413c86300c1f436657b63b /acinclude.m4 | |
| parent | 772fa460d1ef7dede99478e30de756136ea0c7aa (diff) | |
| download | lvm2-d95751cb0b750ea698d665bd8ad8086fe9ee6945.tar.gz | |
configure: detect compiler flag
Use m4 macro AC_TRY_CCFLAG to detect presence of some compiler
option.
Use it to detect -Wjump-misses-init.
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/acinclude.m4 b/acinclude.m4 new file mode 100644 index 000000000..333abb545 --- /dev/null +++ b/acinclude.m4 @@ -0,0 +1,39 @@ +dnl AC_GCC_VERSION +dnl check for compiler version +dnl sets COMPILER_VERSION and GCC_VERSION + +AC_DEFUN([AC_CC_VERSION], +[ + AC_MSG_CHECKING([C compiler version]) + COMPILER_VERSION=`$CC -v 2>&1 | grep version` + case "$COMPILER_VERSION" in + *gcc*) + dnl Ok, how to turn $3 into the real $3 + GCC_VERSION=`echo $COMPILER_VERSION | \ + sed -e 's/[[^ ]]*\ [[^ ]]*\ \([[^ ]]*\)\ .*/\1/'` ;; + *) GCC_VERSION=unknown ;; + esac + AC_MSG_RESULT($GCC_VERSION) +]) + +dnl AC_TRY_CCFLAG([CCFLAG], [VAR], [ACTION-IF-WORKS], [ACTION-IF-FAILS]) +dnl check if $CC supports a given flag + +AC_DEFUN([AC_TRY_CCFLAG], +[ + AC_REQUIRE([AC_PROG_CC]) + ac_save_CFLAGS=$CFLAGS + CFLAGS=$1 + AC_MSG_RESULT([KOUKEJ $name]) + AC_CACHE_CHECK([whether $CC accepts $1 flag], [ac_cv_flag_$2], + [AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], + [AS_VAR_SET([ac_cv_flag_$2], [yes])], + [AS_VAR_SET([ac_cv_flag_$2], [no])])]) + CFLAGS=$ac_save_CFLAGS + $2=AS_VAR_GET([ac_cv_flag_$2]) + if test "$2" = yes; then + ifelse([$3], [], [:], [$3]) + else + ifelse([$4], [], [:], [$4]) + fi +]) |