configure: detect ARM variants

Using gnu make's variable variable-names.

Makefile

@@ -8,11 +8,6 @@ VPATH = $(top_srcdir)
 
 CPPFLAGS = -I$(TOP) # for config.h
 
-CPPFLAGS_P=$(CPPFLAGS) -DCONFIG_TCC_STATIC
-CFLAGS_P=$(CFLAGS) -pg -static
-LIBS_P=
-LDFLAGS_P=$(LDFLAGS)
-
 ifeq (-$(findstring $(GCC_MAJOR),01)-,--)
 CFLAGS+=-fno-strict-aliasing
 ifeq (-$(findstring $(GCC_MAJOR),23)-,--)
@@ -23,12 +18,17 @@ else
 CFLAGS+=-Wno-unused-result
 endif
 endif
-endif
-
+else # not GCC
+ifeq (-$(findstring clang,$(CC))-,-clang-)
 # make clang accept gnuisms in libtcc1.c
-ifeq ($(CC),clang)
 CFLAGS+=-fheinous-gnu-extensions
 endif
+endif
+
+CPPFLAGS_P=$(CPPFLAGS) -DCONFIG_TCC_STATIC
+CFLAGS_P=$(CFLAGS) -pg -static
+LIBS_P=
+LDFLAGS_P=$(LDFLAGS)
 
 ifdef CONFIG_WIN64
 CONFIG_WIN32=yes
@@ -41,31 +41,6 @@ LIBS+=-ldl
 endif
 endif
 
-ifeq ($(ARCH),i386)
-NATIVE_DEFINES+=-DTCC_TARGET_I386
-else ifeq ($(ARCH),x86-64)
-NATIVE_DEFINES+=-DTCC_TARGET_X86_64
-endif
-
-ifeq ($(ARCH),arm)
-NATIVE_DEFINES+=-DTCC_TARGET_ARM
-NATIVE_DEFINES+=-DWITHOUT_LIBTCC
-ifneq (,$(wildcard /lib/ld-linux-armhf.so.3 /lib/arm-linux-gnueabihf/ld-linux.so.3))
-NATIVE_DEFINES+=-DTCC_ARM_EABI -DTCC_ARM_HARDFLOAT
-else ifneq (,$(wildcard /lib/ld-linux.so.3))
-NATIVE_DEFINES+=-DTCC_ARM_EABI
-endif
-NATIVE_DEFINES+=$(if $(shell grep -l "^Features.* \(vfp\|iwmmxt\) " /proc/cpuinfo),-DTCC_ARM_VFP)
-endif
-
-ifdef CONFIG_WIN32
-NATIVE_DEFINES+=-DTCC_TARGET_PE
-endif
-
-ifneq ($(wildcard /lib/ld-uClibc.so.0),)
-NATIVE_DEFINES+=-DTCC_UCLIBC
-endif
-
 # make libtcc as static or dynamic library?
 ifdef DISABLE_STATIC
 LIBTCC=libtcc.so.1.0
@@ -78,6 +53,17 @@ LIBTCC=libtcc.a
 LINK_LIBTCC=
 endif
 
+CONFIG_$(ARCH) = yes
+NATIVE_DEFINES_$(CONFIG_i386) += -DTCC_TARGET_I386
+NATIVE_DEFINES_$(CONFIG_x86-64) += -DTCC_TARGET_X86_64
+NATIVE_DEFINES_$(CONFIG_WIN32) += -DTCC_TARGET_PE
+NATIVE_DEFINES_$(CONFIG_uClibc) += -DTCC_UCLIBC
+NATIVE_DEFINES_$(CONFIG_arm) += -DTCC_TARGET_ARM -DWITHOUT_LIBTCC
+NATIVE_DEFINES_$(CONFIG_arm_eabihf) += -DTCC_ARM_EABI -DTCC_ARM_HARDFLOAT
+NATIVE_DEFINES_$(CONFIG_arm_eabi) += -DTCC_ARM_EABI
+NATIVE_DEFINES_$(CONFIG_arm_vfp) += -DTCC_ARM_VFP
+NATIVE_DEFINES += $(NATIVE_DEFINES_yes)
+
 ifeq ($(TOP),.)
 
 PROGS=tcc$(EXESUF)

configure

@@ -44,6 +44,7 @@ tcc_libpaths=""
 tcc_crtprefix=""
 tcc_elfinterp=""
 tcc_lddir=
+confvars=
 
 cpu=`uname -m`
 
@@ -304,6 +305,17 @@ if test -z "$cross_prefix" ; then
         tcc_lddir="lib64"
       fi
 
+      if test "$cpu" = "armv4l" ; then
+        if test "${triplet%eabihf}" != "$triplet" ; then
+           confvars="$confvars arm_eabihf"
+        elif test "${triplet%eabi}" != "$triplet" ; then
+           confvars="$confvars arm_eabi"
+        fi
+        if grep -s -q "^Features.* \(vfp\|iwmmxt\) " /proc/cpuinfo ; then
+           confvars="$confvars arm_vfp"
+        fi
+      fi
+
 #      multiarch_triplet=${libc_dir#*/}
 #      multiarch_triplet=${multiarch_triplet%/}
 #      tcc_lddir="${libc_dir%%/*}"
@@ -311,6 +323,9 @@ if test -z "$cross_prefix" ; then
 #        tcc_lddir="$tcc_lddir/$multiarch_triplet"
 #      fi
 
+      if test -f "/lib/ld-uClibc.so.0" ; then
+        confvars="$confvars uClibc"
+      fi
 # gr: maybe for after the release:
 #       tcc_elfinterp="$(ldd $CONFTEST | grep 'ld.*.so' | sed 's,\s*\(\S\+\).*,\1,')"
        # echo "elfinterp           $tcc_elfinterp"
@@ -424,6 +439,9 @@ fi
 
 echo "TARGETOS=$targetos" >> config.mak
 
+for v in $confvars ; do
+  echo "CONFIG_$v=yes" >> config.mak
+done
 if test "$noldl" = "yes" ; then
   echo "CONFIG_NOLDL=yes" >> config.mak
 fi