configure: Test whether compiler can create both 32 and 64-bit binaries

[fips] / configure

diff --git a/configure b/configure
index b63103eaa697a25822d7a481b8629991af77b8e9..c584c93a349ad7023f58f4112bc942d4d734c6f8 100755 (executable)
--- a/configure
+++ b/configure
@@ -331,6 +331,57 @@ if [ $have_gl_winsys -eq 0 ]; then
     errors=$((errors + 1))
 fi
 
+printf "int main(void){return 0;}\n" > minimal.c
+
+WARN_CFLAGS=""
+printf "Checking for available C compiler warning flags:\n"
+for flag in -Wall -Wextra -Wmissing-declarations; do
+    if ${CC} $flag -o minimal minimal.c > /dev/null 2>&1
+    then
+       WARN_CFLAGS="${WARN_CFLAGS}${WARN_CFLAGS:+ }${flag}"
+    fi
+done
+printf "\t${WARN_CFLAGS}\n"
+
+rm -f minimal minimal.c
+
+printf "#include <features.h>\nint main(void){return 0;}\n" > arch-minimal.c
+
+printf "Checking for machine-dependent compiler support:\n"
+
+printf "       Compiler can create 32-bit binaries... "
+have_m32=Yes
+if ${CC} -m32 -o arch-minimal arch-minimal.c > /dev/null 2>&1
+then
+    printf "Yes.\n"
+else
+    printf "No.\n"
+    have_m32=No
+fi
+
+printf "       Compiler can create 64-bit binaries... "
+have_m64=Yes
+if ${CC} -m64 -o arch-minimal arch-minimal.c > /dev/null 2>&1
+then
+    printf "Yes.\n"
+else
+    printf "No.\n"
+    have_m64=No
+fi
+
+if [ "$have_m32" = "No" ] || [ "$have_m64" = "No" ]; then
+    cat <<EOF
+
+* Warning: Cannot create both 32 and 64-bit fips libraries. Fips will not
+           support applications of the non-native size. Fixing this may be
+           as simple as running a command such as:
+
+               sudo apt-get install gcc-multilib
+EOF
+fi
+
+rm -f arch-minimal arch-minimal.c
+
 if [ $errors -gt 0 ]; then
     cat <<EOF
 
@@ -385,20 +436,6 @@ EOF
     exit 1
 fi
 
-printf "int main(void){return 0;}\n" > minimal.c
-
-WARN_CFLAGS=""
-printf "Checking for available C compiler warning flags... "
-for flag in -Wall -Wextra -Wmissing-declarations; do
-    if ${CC} $flag -o minimal minimal.c > /dev/null 2>&1
-    then
-       WARN_CFLAGS="${WARN_CFLAGS}${WARN_CFLAGS:+ }${flag}"
-    fi
-done
-printf "\n\t${WARN_CFLAGS}\n"
-
-rm -f minimal minimal.c
-
 cat <<EOF
 
 All required packages were found.
@@ -474,6 +511,10 @@ mandir = ${MANDIR:=\$(prefix)/share/man}
 # The directory to which read-only (configuration) files should be installed
 sysconfdir = ${SYSCONFDIR:=\$(prefix)/etc}
 
+# Whether compiler can create 32 or 64-bit binaries
+COMPILER_SUPPORTS_32 = ${have_m32}
+COMPILER_SUPPORTS_64 = ${have_m64}
+
 # Flags needed to compile and link against talloc
 TALLOC_CFLAGS = ${talloc_cflags}
 TALLOC_LDFLAGS = ${talloc_ldflags}