Import and use apisupport

.gitignore

@@ -27,6 +27,7 @@
 /libtool
 /stamp-h1
 # In-tree build, only top-level
+/apisupport-config.h
 /cpusupport-config.h
 # In-tree build, all directories
 .dirstamp

Makefile.am

@@ -93,6 +93,7 @@ AM_CPPFLAGS= -I$(srcdir)/lib \
  -I$(srcdir)/libcperciva/crypto \
  -I$(srcdir)/libcperciva/util \
  -DCPUSUPPORT_CONFIG_FILE=\"cpusupport-config.h\" \
+ -DAPISUPPORT_CONFIG_FILE=\"apisupport-config.h\" \
  -D_POSIX_C_SOURCE=200809L \
  -D_XOPEN_SOURCE=700 \
  ${CFLAGS_POSIX}
@@ -105,10 +106,15 @@ scrypt_LDADD= libcperciva_aesni.la libcperciva_rdrand.la \
  ${LDADD_POSIX}
 scrypt_man_MANS= scrypt.1
 
+# apisupport needs to access post-configure info: lib-platform/platform.h,
+# config.h, and -DHAVE_CONFIG_H.
+apisupport-config.h:
+ ( export CC="${CC}"; export CFLAGS="-I${top_srcdir}/lib-platform -I${builddir} ${DEFS} ${CFLAGS}"; command -p sh $(srcdir)/libcperciva/apisupport/Build/apisupport.sh "$$PATH") > apisupport-config.h.tmp && command -p mv apisupport-config.h.tmp apisupport-config.h
 cpusupport-config.h:
  ( export CC="${CC}"; export CFLAGS="${CFLAGS}"; command -p sh $(srcdir)/libcperciva/cpusupport/Build/cpusupport.sh "$$PATH") > cpusupport-config.h.tmp && command -p mv cpusupport-config.h.tmp cpusupport-config.h
-BUILT_SOURCES= cpusupport-config.h
-CLEANFILES= cpusupport-config.h cpusupport-config.h.tmp
+BUILT_SOURCES= apisupport-config.h cpusupport-config.h
+CLEANFILES= apisupport-config.h apisupport-config.h.tmp \
+ cpusupport-config.h cpusupport-config.h.tmp
 
 # Libraries from libcperciva code.
 noinst_LTLIBRARIES= libcperciva_aesni.la
@@ -151,7 +157,7 @@ libscrypt_sse2_la_CFLAGS=`. ./cpusupport-config.h; echo $${CFLAGS_X86_SSE2}`
 noinst_LTLIBRARIES+= libscrypt_memlimit.la
 libscrypt_memlimit_la_SOURCES= lib-platform/util/memlimit.c \
  lib-platform/util/memlimit.h
-libscrypt_memlimit_la_CFLAGS=-U_POSIX_C_SOURCE -U_XOPEN_SOURCE
+libscrypt_memlimit_la_CFLAGS=`. ./apisupport-config.h; echo $${CFLAGS_NONPOSIX_MEMLIMIT}`
 
 # Install libscrypt-kdf?
 if LIBSCRYPT_KDF

libcperciva/apisupport/Build/apisupport-NONPOSIX-MEMLIMIT.c

@@ -0,0 +1,19 @@
+#include "platform.h"
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#ifdef HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
+#ifdef HAVE_SYS_SYSINFO_H
+#include <sys/sysinfo.h>
+#endif
+
+int
+main(void)
+{
+
+ /* Success! */
+ return (0);
+}

libcperciva/apisupport/Build/apisupport.sh

@@ -0,0 +1,85 @@
+# Should be sourced by `command -p sh path/to/apisupport.sh "$PATH"` from
+# within a Makefile.
+if ! [ "${PATH}" = "$1" ]; then
+ echo "WARNING: POSIX violation: ${SHELL}'s command -p resets \$PATH" 1>&2
+ PATH=$1
+fi
+
+# Standard output should be written to apisupport-config.h, which is both a
+# C header file defining APISUPPORT_PLATFORM_FEATURE macros and sourceable sh
+# code which sets CFLAGS_PLATFORM_FEATURE environment variables.
+SRCDIR=$(command -p dirname "$0")
+
+CFLAGS_HARDCODED="-D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700"
+
+# Do we want to record stderr to a file?
+if [ "${DEBUG:-0}" -eq "0" ]; then
+ outcc="/dev/null"
+else
+ outcc="apisupport-stderr.log"
+ rm -f "${outcc}"
+fi
+
+feature() {
+ PLATFORM=$1
+ FEATURE=$2
+ EXTRALIB=$3
+ shift 3;
+
+ # Bail if we didn't include this feature in this source tree.
+ feature_filename="${SRCDIR}/apisupport-${PLATFORM}-${FEATURE}.c"
+ if ! [ -f "${feature_filename}" ]; then
+ return
+ fi
+
+ # Check if we can compile this feature (and any required arguments).
+ printf "Checking if compiler supports %s %s feature..." \
+ "${PLATFORM}" "${FEATURE}" 1>&2
+ for API_CFLAGS in "$@"; do
+ if ${CC} ${CPPFLAGS} ${CFLAGS} ${CFLAGS_HARDCODED} \
+ ${API_CFLAGS} "${feature_filename}" ${LDADD_EXTRA} \
+ ${EXTRALIB} 2>>"${outcc}"; then
+ rm -f a.out
+ break;
+ fi
+ API_CFLAGS=NOTSUPPORTED;
+ done
+ case ${API_CFLAGS} in
+ NOTSUPPORTED)
+ echo " no" 1>&2
+ ;;
+ "")
+ echo " yes" 1>&2
+ echo "#define APISUPPORT_${PLATFORM}_${FEATURE} 1"
+ ;;
+ *)
+ echo " yes, via ${API_CFLAGS}" 1>&2
+ echo "#define APISUPPORT_${PLATFORM}_${FEATURE} 1"
+ echo "#ifdef apisupport_dummy"
+ echo "export CFLAGS_${PLATFORM}_${FEATURE}=\"${API_CFLAGS}\""
+ echo "#endif"
+ ;;
+ esac
+}
+
+if [ "$2" = "--all" ]; then
+ feature() {
+ PLATFORM=$1
+ FEATURE=$2
+ echo "#define APISUPPORT_${PLATFORM}_${FEATURE} 1"
+ }
+fi
+
+# Detect how to compile non-POSIX code.
+feature NONPOSIX SETGROUPS "" "" \
+ "-U_POSIX_C_SOURCE -U_XOPEN_SOURCE" \
+ "-U_POSIX_C_SOURCE -U_XOPEN_SOURCE -Wno-reserved-id-macro"
+feature NONPOSIX MEMLIMIT "" "" \
+ "-U_POSIX_C_SOURCE -U_XOPEN_SOURCE" \
+ "-U_POSIX_C_SOURCE -U_XOPEN_SOURCE -Wno-reserved-id-macro"
+
+# Detect how to compile libssl and libcrypto code.
+feature LIBSSL HOST_NAME "-lssl" "" \
+ "-Wno-cast-qual"
+feature LIBCRYPTO LOW_LEVEL_AES "-lcrypto" "" \
+ "-Wno-deprecated-declarations"