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Diffstat (limited to 'm4/vl_prog_cc_warnings.m4')
| -rw-r--r-- | m4/vl_prog_cc_warnings.m4 | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/m4/vl_prog_cc_warnings.m4 b/m4/vl_prog_cc_warnings.m4 new file mode 100644 index 0000000000000..a4163ca34b456 --- /dev/null +++ b/m4/vl_prog_cc_warnings.m4 @@ -0,0 +1,128 @@ +dnl @synopsis VL_PROG_CC_WARNINGS([ANSI]) +dnl +dnl Enables a high level of warnings for the C compiler. Optionally, +dnl if the first argument is nonempty, turns on flags which enforce and/or +dnl enable proper ANSI C if such are known with the compiler used. +dnl +dnl Currently this macro knows about GCC, Solaris C compiler, +dnl Digital Unix C compiler, C for AIX Compiler, HP-UX C compiler, +dnl IRIX C compiler, NEC SX-5 (Super-UX 10) C compiler, and Cray J90 +dnl (Unicos 10.0.0.8) C compiler. +dnl +dnl @version 1.2 +dnl @author Ville Laurikari <vl@iki.fi> +dnl +AC_DEFUN([VL_PROG_CC_WARNINGS], [ + # Don't override if CFLAGS was already set. + if test -z "$ac_env_CFLAGS_set"; then + ansi=$1 + if test -z "$ansi"; then + msg="for C compiler warning flags" + else + msg="for C compiler warning and ANSI conformance flags" + fi + AC_CACHE_CHECK($msg, vl_cv_prog_cc_warnings, [ + if test -n "$CC"; then + cat > conftest.c <<EOF +int main(int argc, char **argv) { return 0; } +EOF + + dnl GCC + if test "$GCC" = "yes"; then + if test -z "$ansi"; then + vl_cv_prog_cc_warnings="-Wall" + else + vl_cv_prog_cc_warnings="-Wall -ansi -pedantic" + fi + + dnl Most compilers print some kind of a version string with some command + dnl line options (often "-V"). The version string should be checked + dnl before doing a test compilation run with compiler-specific flags. + dnl This is because some compilers (like the Cray compiler) only + dnl produce a warning message for unknown flags instead of returning + dnl an error, resulting in a false positive. Also, compilers may do + dnl erratic things when invoked with flags meant for a different + dnl compiler. + + dnl Solaris C compiler + elif $CC -V 2>&1 | grep -i "WorkShop" > /dev/null 2>&1 && + $CC -c -v -Xc conftest.c > /dev/null 2>&1 && + test -f conftest.o; then + if test -z "$ansi"; then + vl_cv_prog_cc_warnings="-v" + else + vl_cv_prog_cc_warnings="-v -Xc" + fi + + dnl Compaq (formerly Digital Unix) C compiler + elif ($CC -V 2>&1 | grep -i "Digital UNIX Compiler" > /dev/null 2>&1 || + $CC -V 2>&1 | grep -i "Compaq C" > /dev/null 2>&1) && + $CC -c -verbose -w0 -warnprotos -std1 conftest.c > /dev/null 2>&1 && + test -f conftest.o; then + if test -z "$ansi"; then + vl_cv_prog_cc_warnings="-verbose -w0 -warnprotos" + else + vl_cv_prog_cc_warnings="-verbose -w0 -warnprotos -std1" + fi + + dnl C for AIX Compiler + elif $CC 2>&1 | grep -i "C for AIX Compiler" > /dev/null 2>&1 && + $CC -c -qlanglvl=ansi -qinfo=all conftest.c > /dev/null 2>&1 && + test -f conftest.o; then + if test -z "$ansi"; then + vl_cv_prog_cc_warnings="-qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd:nouni:nocnv" + else + vl_cv_prog_cc_warnings="-qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd:nouni:nocnv -qlanglvl=ansi" + fi + + dnl IRIX C compiler + elif $CC -version 2>&1 | grep -i "MIPSpro Compilers" > /dev/null 2>&1 && + $CC -c -fullwarn -ansi -ansiE conftest.c > /dev/null 2>&1 && + test -f conftest.o; then + if test -z "$ansi"; then + vl_cv_prog_cc_warnings="-fullwarn" + else + vl_cv_prog_cc_warnings="-fullwarn -ansi -ansiE" + fi + + dnl HP-UX C compiler + elif what $CC 2>&1 | grep -i "HP C Compiler" > /dev/null 2>&1 && + $CC -c -Aa +w1 conftest.c > /dev/null 2>&1 && + test -f conftest.o; then + if test -z "$ansi"; then + vl_cv_prog_cc_warnings="+w1" + else + vl_cv_prog_cc_warnings="+w1 -Aa" + fi + + dnl The NEC SX-5 (Super-UX 10) C compiler + elif $CC -V 2>&1 | grep "/SX" > /dev/null 2>&1 && + $CC -c -pvctl[,]fullmsg -Xc conftest.c > /dev/null 2>&1 && + test -f conftest.o; then + if test -z "$ansi"; then + vl_cv_prog_cc_warnings="-pvctl[,]fullmsg" + else + vl_cv_prog_cc_warnings="-pvctl[,]fullmsg -Xc" + fi + + dnl The Cray C compiler (Unicos) + elif $CC -V 2>&1 | grep -i "Cray" > /dev/null 2>&1 && + $CC -c -h msglevel 2 conftest.c > /dev/null 2>&1 && + test -f conftest.o; then + if test -z "$ansi"; then + vl_cv_prog_cc_warnings="-h msglevel 2" + else + vl_cv_prog_cc_warnings="-h msglevel 2 -h conform" + fi + + fi + rm -f conftest.* + fi + if test -n "$vl_cv_prog_cc_warnings"; then + CFLAGS="$CFLAGS $vl_cv_prog_cc_warnings" + else + vl_cv_prog_cc_warnings="unknown" + fi + ]) + fi +])dnl |