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-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